I love the Xtend. I am an installer in the Netherlands and have installed about 12 xtends. I haven’t had any problems with the cct. I always use an 25L - 50L buffer. The Xtend works with almost every boiler. Even boilers without opentherm.
Lovely piece of information there. Watching the video my thought was in Holland installers might or might not have come across issues with the ccts. Then @timkors1346 answered my question. I might get one for my house
Would using the NRG awareness zone product work here , trying the 2 units better together and replacing the heath robertson low less header ? ( I am not a heating engineer just asking )
From a technical perspective it was really interesting. From a sales perspective it was an analogue of Gerald Ratners prawn sandwich. I really like the idea of a heat pump but I could not see myself ever adopting a solution like this - it’s just adding a whole other level of complexity and the perceived benefit is marginal. The proposed solution to the boiler short circuit through the CCT, is a buffer tank (or is it low loss header) and now you have the overhead of three pumps. The bit I did not understand fully is the bit about the boiler pump being on full output all the time and that was ‘overpowering the CCT’ - surely the Intergas has a burner linked pump? All that being said the 5KW ASHP should cope with most modern small properties for most of the heating system and the boiler required maybe for a month or two - makes you wonder if would be easier just to change over the heat sources with zone valves, which you could probably control by flow temp from the ASHP (using weather compensation) using the logic of greater than x degrees for two hours - change to boiler. Thanks for sharing this though.😀👍
Thank you very much for this type of video. Learned a lot, The fact that Tommy is changing his set up at his house says enough I think. Keep up the videos Still waiting for the garage update of your Valiant eco tec
Lots of people seem to love mini splits, this would be neat to have on one of the mini split channels. A/C in summer and boiler assist for central heating in the winter. The only challenge seems to be integration.
Love this idea and I personally have applied similar installations on commercial properties. The premise is the same but with a different execution. I think your on the correct path with the limitations of the little heat exchangers it should have more surface area and a means to blend the boiler supply and return for a to maintain a constant so the boiler can modulate evenly. Great application 👍 and I'll watch for updates and possible control points. Hello from New Jersey and tonight the temperature will be down to 28 degrees. "F" LOL
Very interesting. Thank you for the video. I checked the price of the Xtend and it is over £4000. If you add install it is going to be a very expensive upgrade for a marginal benefit. intergas mentions a 82.5% drop in gas consumption but fails to mention the increased electricity consumption. Technically interesting but only viable if it makes sense economically. Not sure this is the case.
@ 13:08 yes - homes with underfloor heating when is not that cold… but It might need a grundfos 15-75 pump inside to be able to run the underfloor heatting by itself on 100-120 square meters without an auxiliary pump …
this has the potential to revolutionize the adoption of ashp's in the UK. But only if the government get off their high horse and start funding heat pumps even in the case the user is not willing to get rid of their perfectly fine gas boiler. At the moment, you can access a grant only if there is a complete swap over to a heat pump, which is not a thing a lot of people are willing to chance. Plenty of stories out there with conversions going wrong, huge electric bills, and not a lot of comfort at the end. Also, on a side note, you just gotta love it when the management page for your multi-thousand pound heat pump misspells 'thermmal'. Confidence builder right there.
I wanted to confirm that the combi could still supply instant DHW with this setup, so watched again and indeed, that is confirmed by comment "no need for hot water cylinder". I believe this is going to make this set up a viable option for the majority of properties in the UK, as millions have had combi boilers fitted to gain room space (mainly in the form of loft conversions) leaving no room/space for a cylinder to be put back in!
Thank you forbl sharing, personally I can absolutely see myself using this, I have 1 year old 36kw baxi combi in my well insulated new build property which is stupidly oversized for heating (minimum 9kw modulation). When I moved in it had stupid on/off controls and weather comp sensor disconnected, I installed Drayton wiser controls using opentherm and it now runs better but it is cycling badly because of the oversize. How does this integrate with existing controls... Would my wiser connect to the extend unit over OT or do you have to use intergas controls now? This would be a great solution for me as I have a combi which is totally unsuitable for my heating load so I could use ASHP for that and then hopefully only need the combi for hot water.
I think that there is a market for it ,a buffer looks like a good idea assuming it works but it all comes down to space as alot of properties now don't have the space
MOST INFORMATIVE! I love te idea of having a unit that takes u very ittle space. I have a hybrid system at home in Poland........ where December - February we expriences temps. below zero degrees Celcius....like now. Electricty down to sero degrees and gas below zero......Paying as much for heating now as I was before the cost of fuel and elctricty went up ..... but =had to invest in a heat pump and buffer.
I am looking to install an HP next Spring. It will have to cope with heating and DHW but if it struggles in mid winter then an immersion heating will back it up. I will then cancel the gas connection and save on the standing charge. Being warm and 100% green is my goal. Current set up: Energy supplier Octopus, 3.4 PV solar with 5.2 kWh battery. I am sure the hybrid gas/HP with Xtend will be fine for many people.
I have similar system buy 5.9Kwp. 2 Years ago installed Samsung HP 8Kw. In 1 year cost of drop down by 10-15% compared to gas boiler. (Could be more but noticed that from late nov to mid jan there is a tree shading over my panels i most important part of a day) This year I got 5.2 kWh battery and charge every night. Since heating started my export hit 0 so I use all power from PV. Also notice that currently I use more kWh from night tariff. To think off 10Kwh should be better for winter. Only problem is sell property with HP as ppl are afraid of it and thinking that its cost is the same as standard electric heating.
Are these hybrid systems eligible for the grant available for the heat pumps? I have a relatively new boiler and would like to understand how the hybrid system from Vaillant is working, would be great if you could make a video.
Looking at the price on intergasshop it looks to be cost prohibitive once the installation cost is factored in on top. May as well go for a full ASHP system at the moment to get the grant.
Great video! Would love to see your thoughts on the Vaillant Hybrid setup (thats what I have installed) and how it differs. From what I could see it is much like the proposed setup with the buffer installed and I can set the system based on unit rates to determine which heat source is the most economical to heat the house. For me was the best solution at the time as it meant the existing rad setup etc. could remain unchanged (I did replace some older units and add a couple myself, but in general the upheaval in the house was minimal.
@@mitchienl2509 what subsidies do you get for a full heat pump and for a hybrid? Here we only get subsidies if you remove gas completely, so no subsidies for hybrids.
I too have connected my boiler to my pool. I suck/pump the pool water out of the pool via a filter, it intercepts the cold mains going into the boiler, sending it back out of the boiler heated straight back to the pool. The end result is it heats up fast. I've also installed an electric shower next to my bar mixer shower for when my combi is in use by the pool.
Seems as though there will be more boiler cycling with this setup, even if it has a low minimum output. The boiler is providing only a supplemental load, which is bound to be less than if it was the only heating source. Hybrid might help out with niche setups but pure ASHP seems the way to go if at all possible.
Thanks for that. Also Iam trying to make my x plan a x plan plus by fitting a mid position valve after the N/O valve . It works to a degree however Iam struggling with the opentherm on the nest wiring. Any help? Cheers Jimmy.
To me it makes perfect sense, a hybrid system would give better performance, those days when its very cold and your COP drops from the ASHP, the gas boiler helps to raise water temp, then, when its summer a PV and/or solar WH would compliment the ASHP, thus improving your energy consumption.
Hi Simon, sorry if this is covered in the comments below, but I'm confused how this works? Outside temp too low thereby increasing heat loss thereby necessitating higher flow temps, beyond which is economic for the heat pump to supply, so 'boost' with gas boiler... OK, that seems to work.... but, won't the return flow temps be then too high for the heat pump? Will it actually be able to contribute anything in this situation??
You need far better modulation for this to work imo. The pump should pump away from the cct not into it. With such big low end output from the intergas the heat pump will be held back. The lowest modulated output modulated output from an intergas will meet most of the demand from the average house without a heat pump. A buffer rather than a CCT would allow the oversized output of the intergas to be stored and added as needed to the flow temperature from the heat pump. Maybe a mixing valve could be used to mix buffer water with the flow from the heat pump to supplement it. This would allow the boiler to cycle rather than stifle the heat pump output. This could also deal with defrost issues if the buffer could be connected to the system return also. I've not thought this through very deeply just my immediate assumptions. As yet I'm not in the anti Buffer and anti separation Club. Sometimes I think the obsession with distortion prevents people from correctly using buffers hydraulic separation when needed. There are some phenomena causing heat pumps to not work well that I believe buffers can help alleviate. I believe we can engineer out the disadvantages and harness the advantages of buffers and low loss headers.
I don't wish to be negative but I am struggling with the whole concept of this design. If you are going to use a heat pump, fit a decent one on a suitable system that will deal with the heating and hot water. This system appears to only deal with half the heat demands ? Too cold - use the boiler. DHW - use the boiler. I struggle to see a huge advantage of overall energy savings ? Perhaps if a heat pump isnt suitable and you need the boiler, fit a decent one with manufacturer controls and spend the money insulating the house as much as you are able to reduce gas consumption ? Ideally this should be done anyway regardless of the type of system. It seems that complexity is being added with limited appeal/potential. Sorry for the "downer". I will re-assess another time to pick up what I may have missed. Keep the videos going. You are a good guy in an industry that needs as many as possible.
Smaller heat pump will be very efficient and will take care of 80-90% of the heating needs at scops of close to 400-500%. DHW is only around 15-20% of energy use.
But if you are getting 400% on a decent heat pump, simpler system, no duplicity, no gas/standing charge, no boiler servicing/repairs, no "Extend" service repairs and redundancy on hot water ? Will a little more on the COP really be worthwhile ? Only my initial thoughts but I will take more time to look at it and give greater consideration. Thank you
Daikin was using the Intergas boiler with heat pump system nearly 10 years ago, shame it didn't catch on, even then you could set the electric price, the gas price and the system would work out the best way to run.
Yes, the Daikin hybrid system also uses intergas gas boilers. But the advantage of Daikin hybrid system over Intergas own hybrid system is that the gas boiler can work on its own even if the heat pump fails, according to Viva Training. Intergas should copy what Daikin do, they both use the same boilers, it's just the rest of the system that's different.
It wouldn’t. But vaillant heat pumps would work with vaillant boilers. I toyed with the idea of doing it at my own place, but probably will not bother anymore and remove gas all together
@UrbanPlumbers Would love an update, more in depth info on the software would be great if possible, a walk through on how to configure for peak, and off peak electricity costs for example ?
Love your videos - installed Intergas Xclusive 36 -which is great - as a Combi in Jan (after watching your vids)and this unit wasn’t available in uk at the time In Oct installed 2x Toshiba Haori 4kw air to air units One for the Lounge 20ft by 15ft and the other for the same size bedroom above (total of five double rads now not used) Gas savings seem to exceed the cost to run Haori units Plus once we are in the lounge /bedroom in the evening the boiler can be turned off or on at a lower temp- early days yet but impressed so far Plus aircon in the summer if required Kind of the same idea as video 🤔😂
Ultimately I'd like something similar but a back boiler on the wood stove going to a buffer to boost an air source heat pump. Not sure if it's possible or something anyone will agree too fit!
I don't really like the idea of this tbh. The heat pump doesn't seem very good compared to other modern heat pumps that can work at very low temperatures. Surely it would be better to just have a decent heat pump, then you can get rid of gas and not pay the standing charge, not have two things to break down, and not have any direct carbon footprint from your heating.
It seems like a good idea to make the boiler and heatpump work in conjunction with one another, but is it really? The boiler needs to run when the heatpump can't provide enough flow temperature or the COP is getting too low, right? I think you can replace the "or" with "and" in this statement: as long as the heat demand is low enough to keep the COP above a certain treshold the flow temperature won't need to be maxed out to meet that demand, but when the heat demand goes beyond what the heatpump can deliver the COP will also drop because of the low outside temperature. So I believe in most cases, it will either be beneficial to run purely on the heatpump or purely on the boiler, with only very few circumstances justifying the use of both at the same time for heating. Hard-switching between the two sources and using valves to prevent both pumps acting on eachother seems like a much more efficient idea than insisting on the possibility of running both at the same time and needing a buffer to counteract the downsides of that setup, no?
I really like this ideea, but in the end is it worth the difference in investment cost, taking into account that you get a less reliable system due to the complications brought to the system (useful by the way) and all this in the name of saving the environment? wouldn't it be easier to be less aggressive/sporty at the wheel to compensate by far for the climate difference? I pay about 3 times more for gasoline than for heating the house... and I think I would pollute less if I learned to drive more calmly...
I suspect the mass flow from the boiler exhaust is a small percentage of the mass flow through the ASHP and is not worth the engineering cost to effect this.
It's more sensible to connect to a low loss header/buffer than use a CCT if head is too great on the pump of one unit and the CCT is too close to a unit. Generally try to avoid CCT on systems with multiple inputs because of it.
The main issue i see is that as soon as it drops below zero the ASHP frosts up and the COP drops through the floor. This is the exact time you need the highest output from your heating and the ASHP can't do that. A boiler can regardless of external temperatures.
By no means do I know a lot about this but I can imagine it could be a thing that would get people away from buying larger then necessary heat pumps for the few days in winter where it may not be as efficient. Especially if they already have a boiler. I even wonder if you could have an apartment building with small heat pumps for the flats and then a gas boiler at the basement so that you could run the smallest possible (and cheapest) heat pumps knowing that there is a backup.
Seconded. Even when we're not talking about flats, there are newly built houses (I'm in the UK) with no obvious space for a big water tank. Having the combi boiler for domestic hot water and some sort of hybrid system for central heating appeals to me, especially because I'm getting credit on the electric bill during the months when solar generation is higher.
I like that it can potentially be added to any OpenTherm Gas Boiler. Why not use electronic valves instead of a CCT surely that's the simplest solution? Not withstanding the lack of BUS Scheme Grant in the UK, unfortunately based on the current price of Gas v Electricity you would need a SCOP of 3.5-4 for it to be financially viable. Using a setup like that shown ie. Combi Boiler + Hybrid HP wouldn't it be best to run a two HW Cylinder setup? eg. One that combines a HW Cylinder and a Buffer Tank in a single unit? Surely, ultimately, it's more beneficial to run the HP to raise the temp of the water to 35' and then fire the Gas Boiler to raise it to 50-55'c?
Depends on cost and your current boiler. If you've got solar panels already it could be a winner, especially if you don't use a lot of hot water and don't want a cylinder
I think it would be better with a buffer. With the poor modulation associated with the intergas boiler a buffer would help to control the excessive output
@ 2:59 by the way you are dressed, it can be seen that you also "like" working in the cold ... and you tell me in one comment that I complain when I say that it is not suitable for me to sit still outside for 1-5 hours in front of a heat pump to diagnose what defect it has
@ 2:00 Open therm? Alpha(Immergas) + Vaillant + other brands will take their boilers to the church to not get the open therm deamon 😂 … i had to buy a special module from Holland (mentioned by you in another video 😅) to connect a Nest thermostat to a Vaillant Gas boiler 😂 …
Why not just add a ASHP in series with the gas/petrol boiler network and have the boiler pump run all the time? ASHP can work with temperatures above 2C and boiler for lower outdoor temperatures. As a retrofit mostly but as a new system as well. Too much controls?
You were discussing reducing your carbon footprint... And then a few minutes later show us how the gas boiler is used to heat an open-air swimming pool! 🤪
The Xtend is too small, to meet most demands and also access funding. From my understanding you won't get gov. funding through mcs unless the ASHP meets the full heat loss now in Scotland, even for hybrids (except in extenuating circumstances) So only having 5 Kw available, (3 at sub zero temps?) is a bit small & limited for the majority of houses up here... And most won't install without funding...
Just looks overly complicated and a massive turn off as a potential ASHP customer. I would rather have a well designed ASHP system. I am sure their are use cases but I just don't see it.
Agree. Plus, if you're only using it for a couple of cold days, you're still facing additional cost. First you have the upfront costs. And additionally you have the fix cost for the gas line and the chimney sweeper. I can't see how you will ever save money with this. But it's probably appealing to people who have heatpump anxiety.
System pump should pump away from the expansion tank. Because it's before the line with the expansion tank, the system pump wants to pump into the gas boiler instead of through the system.
The refrigerant lines here don't look brilliantly installed, and it is a shame to see the indoor unit connected with flare fittings rather than a solid brazed connection. Possibly more installer friendly this way, but in the world of professional air conditioning installs, you see less and less flare fittings on unit connections as they represent a potential leak point. I imagine adding split refrigerant circuits to a heating system will lead to hugely increased risk of accidental refrigerant discharge where the knowledge and expertise of those servicing / repairing the heating system has to catch up to overlap with that of refrigeration. When you get an installed base of such units (and don't get me wrong, they look like an excellent development when some of the hydraulic kinks are worked out), it will be important that they are maintained by people who are clueful not to disturb the refrigeration side of the system unless they are trained and qualified (and competent) to do so. Brazed unit connections on the refrigeration side would remove a potential risk point. Just out of curiosity, what refrigerant is this system running? Do you know if the unit is reversible (so it can defrost the outdoor unit by pulling heat from the hydraulic circuit).
Mmhhh, I'm not sold on this. Seems a bit like hybrid cars:- twice the complexity. If a heat pump can't get a property up to temperature it should not be installed. ICE cars make more sense in some applications, and BEV's make more sense in others. The main benefit of a heat pump in my eyes is to be able to get rid of the gas meter and save the standing charges on gas mains supply....
The Xtend system does not offer total redundancy (boiler fails, heat pump will still heat the house/DHW and vice versa). You would be foolish to install this system in its current state.
@ 1:15 this is a very basic performing heat pump … it looks like a generic brand from China relabeled… Alpha(Immergas) brand of boilers ar doing @ the same thing…
Who makes it for intergas ? It’s not much of a solution for anything when it’s only 5kw. Not impressed at all. Very poor compared to the rest of the market
@BenIsInSweden could be anything. Feels like aircon unit adapted for heating. I like the fact that it’s only 3kW at -2. Could do my house without cycling
If your heat pump can cover all heating loads than you don’t need a hybrid. Surely the point of a hybrid is to put a small heat pump in that can do a lot of the load most of the time and then let the gas pick up when demand goes up.
Or, if you only need 5kw, buy a decent (german) heatpump that can still produce 45C water till - 15C and 65C with - 7C, there are brands that can do this and still have a COP of around 3,5 to 4,5...
In other words ASHP are still not suitable for all and GAS boilers need to do the heavy lifting. save your money and just install a gas combi and accept UK is not part of any global warming problem.
Co2 is not a pollutant, it’s not toxic to the local environment or indeed anyone, it is however one of the global warming gases, it affects at a global level. I wish people paid attention at school.
Surreal. We have an existing gas boiler that works effectively on its own to heat the house. Then an additional expense is incurred to install a heat pump which the installer admits won't work on its own so the existing gas boiler remains to help it out. 🤡🌍
That set up lowers your running cost and carbon emissions and allows you the time to get the house fully ready for removal of gas. I believe in Nederlands where this set up is made, you can’t install gas boilers without it anymore
That look like a terrible setup. At least the alpha one works. They are not bothered about their carbon footprint with a swimming pool in the garden. 😂
@@BristolHeatPumps the alpha one works, this one is a comedy sketch. Daikin one seems to work ok, anything but this. Let’s try and reduce our carbon while heating our pool 😂
@@AllenHart999 what do you classify as “works” pretty broad range. If your talking about it being a good stepping stone into renewables and putting it against other manufacturers hybrid options its an absolute shambles.
Sounds like heat pumps then are not good enough to be able to do the job on it’s own so needs a backup, heat pumps are relatively new so is it because they are new they are not as efficient as what we’re told , all I hear about heat pumps is they are 160% more efficient than gas boilers and I’ve heard from some experts they are 400% more efficient , sorry for using the word expert especially after the lockdowns scenario the word expert would be used with a warning sticker.
Not at all, there are plenty of heat pumps out there that can handle it all on its own. This is more of a compromise of not having to do as much in the way of upgrades to rads etc, and utilising the combi boiler for DHW forgoing needing a cylinder. Heat Pumps aren't new either, they are fairly new to the UK, but in other countries, they have been used for decades, proving their efficiency.
@@BenIsInSweden Are they less expensive in other countries not only the purchase price but the cost of running them , the information that I’ve heard be it correct or incorrect is they are expensive to run even though they are more efficient, with electric being four time more expensive than gas and that was the electric company who said that , I find it somewhat amusing all those who are trying to go green with getting a heat pump are still paying 15 % of their bill for the green agenda, one would think taking the 15% off would generate more interest in purchasing a heat pump, sounds like a Black Adder scenario go green and still pay 15 % for the green agenda.
@@KavanOBrien cost of the actual units is similar. Running costs depends on a few factors, like last December due to a series of unfortunate events, I was paying around 60p/kWh for electricity. Even with electricity being 4x more expensive than gas, a properly installed heat pump will for the most part be cheaper to run. However, I don't see electricity always being 4x the cost of gas in the UK, especially considering more people are taking up solar and battery storage.
@@BenIsInSweden yet the price of electricity is going up 5% in January 2024 , even those who do go for solar and battery storage are still paying 15 % of their bill for the green agenda, talk about dying is easy comedy is hard, imagine someone having solar battery and heat pump they will still pay the 15% green agenda tax = comedy on steroids , don’t know why nobody talks about small domestic wind turbines, would like to see one small wind turbine go against a solar panel to see which is more efficient most days and nights are windy yet solar only power the battery when the sun decides to get up.
Much lower maintenance as boiler has to work less. Lower running costs. I’ve weather compensated heating. No breaks in heating with DHW demand. Much lower carbon emission. Much lower energy issue. Much more efficient overall system, but yeah - keep your head in the sand
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I love the Xtend. I am an installer in the Netherlands and have installed about 12 xtends. I haven’t had any problems with the cct. I always use an 25L - 50L buffer. The Xtend works with almost every boiler. Even boilers without opentherm.
Good to know. Could I talk to you via DM or email please?
@@UrbanPlumbershow do we get in contact? I am not sure how dm works on youtube. I also cannot post my mail adress on here?
@timkors1346 can you message me from a form on my web site? Www.urbanplumbers.Co.uk
Lovely piece of information there. Watching the video my thought was in Holland installers might or might not have come across issues with the ccts. Then @timkors1346 answered my question. I might get one for my house
Would using the NRG awareness zone product work here , trying the 2 units better together and replacing the heath robertson low less header ? ( I am not a heating engineer just asking )
From a technical perspective it was really interesting. From a sales perspective it was an analogue of Gerald Ratners prawn sandwich. I really like the idea of a heat pump but I could not see myself ever adopting a solution like this - it’s just adding a whole other level of complexity and the perceived benefit is marginal. The proposed solution to the boiler short circuit through the CCT, is a buffer tank (or is it low loss header) and now you have the overhead of three pumps. The bit I did not understand fully is the bit about the boiler pump being on full output all the time and that was ‘overpowering the CCT’ - surely the Intergas has a burner linked pump?
All that being said the 5KW ASHP should cope with most modern small properties for most of the heating system and the boiler required maybe for a month or two - makes you wonder if would be easier just to change over the heat sources with zone valves, which you could probably control by flow temp from the ASHP (using weather compensation) using the logic of greater than x degrees for two hours - change to boiler.
Thanks for sharing this though.😀👍
Thank you very much for this type of video.
Learned a lot, The fact that Tommy is changing his set up at his house says enough I think.
Keep up the videos
Still waiting for the garage update of your Valiant eco tec
Eco Tec will not happen now. Getting rid of gas full stop.
Lots of people seem to love mini splits, this would be neat to have on one of the mini split channels. A/C in summer and boiler assist for central heating in the winter. The only challenge seems to be integration.
Love this idea and I personally have applied similar installations on commercial properties.
The premise is the same but with a different execution. I think your on the correct path with the limitations of the little heat exchangers it should have more surface area and a means to blend the boiler supply and return for a to maintain a constant so the boiler can modulate evenly.
Great application 👍 and I'll watch for updates and possible control points.
Hello from New Jersey and tonight the temperature will be down to 28 degrees. "F" LOL
Very interesting. Thank you for the video. I checked the price of the Xtend and it is over £4000. If you add install it is going to be a very expensive upgrade for a marginal benefit. intergas mentions a 82.5% drop in gas consumption but fails to mention the increased electricity consumption. Technically interesting but only viable if it makes sense economically. Not sure this is the case.
@ 13:08 yes - homes with underfloor heating when is not that cold… but It might need a grundfos 15-75 pump inside to be able to run the underfloor heatting by itself on 100-120 square meters without an auxiliary pump …
I have to say that I'm really interested in this approach. Watching with interest for any future videos you post on this subject.
this has the potential to revolutionize the adoption of ashp's in the UK. But only if the government get off their high horse and start funding heat pumps even in the case the user is not willing to get rid of their perfectly fine gas boiler. At the moment, you can access a grant only if there is a complete swap over to a heat pump, which is not a thing a lot of people are willing to chance. Plenty of stories out there with conversions going wrong, huge electric bills, and not a lot of comfort at the end.
Also, on a side note, you just gotta love it when the management page for your multi-thousand pound heat pump misspells 'thermmal'. Confidence builder right there.
Imagine if the Brits had to write their manuals in French or German, Czech, Polish.. Hungarian!
I wanted to confirm that the combi could still supply instant DHW with this setup, so watched again and indeed, that is confirmed by comment "no need for hot water cylinder".
I believe this is going to make this set up a viable option for the majority of properties in the UK, as millions have had combi boilers fitted to gain room space (mainly in the form of loft conversions) leaving no room/space for a cylinder to be put back in!
Love the idea, definitely needs a buffer, just been on the alpha course, but it is limited because you can only fit it on alpha boilers.
Alpha needing only an alpha boiler is such a fail
Thank you forbl sharing, personally I can absolutely see myself using this, I have 1 year old 36kw baxi combi in my well insulated new build property which is stupidly oversized for heating (minimum 9kw modulation). When I moved in it had stupid on/off controls and weather comp sensor disconnected, I installed Drayton wiser controls using opentherm and it now runs better but it is cycling badly because of the oversize. How does this integrate with existing controls... Would my wiser connect to the extend unit over OT or do you have to use intergas controls now? This would be a great solution for me as I have a combi which is totally unsuitable for my heating load so I could use ASHP for that and then hopefully only need the combi for hot water.
I think that there is a market for it ,a buffer looks like a good idea assuming it works but it all comes down to space as alot of properties now don't have the space
MOST INFORMATIVE! I love te idea of having a unit that takes u very ittle space. I have a hybrid system at home in Poland........ where December - February we expriences temps. below zero degrees Celcius....like now. Electricty down to sero degrees and gas below zero......Paying as much for heating now as I was before the cost of fuel and elctricty went up ..... but =had to invest in a heat pump and buffer.
I am looking to install an HP next Spring. It will have to cope with heating and DHW but if it struggles in mid winter then an immersion heating will back it up. I will then cancel the gas connection and save on the standing charge. Being warm and 100% green is my goal. Current set up: Energy supplier Octopus, 3.4 PV solar with 5.2 kWh battery.
I am sure the hybrid gas/HP with Xtend will be fine for many people.
I have similar system buy 5.9Kwp. 2 Years ago installed Samsung HP 8Kw. In 1 year cost of drop down by 10-15% compared to gas boiler. (Could be more but noticed that from late nov to mid jan there is a tree shading over my panels i most important part of a day) This year I got 5.2 kWh battery and charge every night. Since heating started my export hit 0 so I use all power from PV. Also notice that currently I use more kWh from night tariff. To think off 10Kwh should be better for winter. Only problem is sell property with HP as ppl are afraid of it and thinking that its cost is the same as standard electric heating.
Are these hybrid systems eligible for the grant available for the heat pumps? I have a relatively new boiler and would like to understand how the hybrid system from Vaillant is working, would be great if you could make a video.
Nope. Grant is only applicable for switching to solely a heat pump.
No. You have to disconnect gas completely to qualify.
Looking at the price on intergasshop it looks to be cost prohibitive once the installation cost is factored in on top.
May as well go for a full ASHP system at the moment to get the grant.
Great video! Would love to see your thoughts on the Vaillant Hybrid setup (thats what I have installed) and how it differs. From what I could see it is much like the proposed setup with the buffer installed and I can set the system based on unit rates to determine which heat source is the most economical to heat the house. For me was the best solution at the time as it meant the existing rad setup etc. could remain unchanged (I did replace some older units and add a couple myself, but in general the upheaval in the house was minimal.
Love the xtend. Installed like 30 xtend till now. No issues.
Are they that popular in NL? Why is that?
@@UrbanPlumbers goverment is paying subsidy to people or landlords for installing heatpumps.
@@mitchienl2509 what subsidies do you get for a full heat pump and for a hybrid? Here we only get subsidies if you remove gas completely, so no subsidies for hybrids.
Air to air systems have no subsidies except they are free of VAT for equipment and installation
ye we know, but its not the topic right?@@davebaker4620
I too have connected my boiler to my pool. I suck/pump the pool water out of the pool via a filter, it intercepts the cold mains going into the boiler, sending it back out of the boiler heated straight back to the pool. The end result is it heats up fast. I've also installed an electric shower next to my bar mixer shower for when my combi is in use by the pool.
Sounds pretty illegal as you describe it, isn’t there a risk you pump pool water back into the water mains.
Seems as though there will be more boiler cycling with this setup, even if it has a low minimum output.
The boiler is providing only a supplemental load, which is bound to be less than if it was the only heating source.
Hybrid might help out with niche setups but pure ASHP seems the way to go if at all possible.
wat is the diffent. between the first intergas daikin combo and this intergas one?
Great video, would this work on 24k HRE heat only using a x plan with opentherm ?
yeah, should work fine
Thanks for that. Also Iam trying to make my x plan a x plan plus by fitting a mid position valve after the N/O valve . It works to a degree however Iam struggling with the opentherm on the nest wiring. Any help? Cheers Jimmy.
Interesting, I agree re buffer plus immersion, would be good to revisit plus 6 months and crunch to numbers
We will revisit this job once the CCT is changed to a buffer
To me it makes perfect sense, a hybrid system would give better performance, those days when its very cold and your COP drops from the ASHP, the gas boiler helps to raise water temp, then, when its summer a PV and/or solar WH would compliment the ASHP, thus improving your energy consumption.
Hi Simon, sorry if this is covered in the comments below, but I'm confused how this works? Outside temp too low thereby increasing heat loss thereby necessitating higher flow temps, beyond which is economic for the heat pump to supply, so 'boost' with gas boiler... OK, that seems to work.... but, won't the return flow temps be then too high for the heat pump? Will it actually be able to contribute anything in this situation??
Sure but once the demand compensation throttles the flow temperature back down it can kick in again.
You need far better modulation for this to work imo. The pump should pump away from the cct not into it. With such big low end output from the intergas the heat pump will be held back. The lowest modulated output modulated output from an intergas will meet most of the demand from the average house without a heat pump. A buffer rather than a CCT would allow the oversized output of the intergas to be stored and added as needed to the flow temperature from the heat pump. Maybe a mixing valve could be used to mix buffer water with the flow from the heat pump to supplement it. This would allow the boiler to cycle rather than stifle the heat pump output. This could also deal with defrost issues if the buffer could be connected to the system return also. I've not thought this through very deeply just my immediate assumptions. As yet I'm not in the anti Buffer and anti separation Club. Sometimes I think the obsession with distortion prevents people from correctly using buffers hydraulic separation when needed. There are some phenomena causing heat pumps to not work well that I believe buffers can help alleviate. I believe we can engineer out the disadvantages and harness the advantages of buffers and low loss headers.
I don't wish to be negative but I am struggling with the whole concept of this design.
If you are going to use a heat pump, fit a decent one on a suitable system that will deal with the heating and hot water.
This system appears to only deal with half the heat demands ? Too cold - use the boiler. DHW - use the boiler. I struggle to see a huge advantage of overall energy savings ?
Perhaps if a heat pump isnt suitable and you need the boiler, fit a decent one with manufacturer controls and spend the money insulating the house as much as you are able to reduce gas consumption ? Ideally this should be done anyway regardless of the type of system.
It seems that complexity is being added with limited appeal/potential.
Sorry for the "downer". I will re-assess another time to pick up what I may have missed.
Keep the videos going. You are a good guy in an industry that needs as many as possible.
Smaller heat pump will be very efficient and will take care of 80-90% of the heating needs at scops of close to 400-500%. DHW is only around 15-20% of energy use.
But if you are getting 400% on a decent heat pump, simpler system, no duplicity, no gas/standing charge, no boiler servicing/repairs, no "Extend" service repairs and redundancy on hot water ? Will a little more on the COP really be worthwhile ? Only my initial thoughts but I will take more time to look at it and give greater consideration.
Thank you
Seems a great system
Daikin was using the Intergas boiler with heat pump system nearly 10 years ago, shame it didn't catch on, even then you could set the electric price, the gas price and the system would work out the best way to run.
Yes, the Daikin hybrid system also uses intergas gas boilers. But the advantage of Daikin hybrid system over Intergas own hybrid system is that the gas boiler can work on its own even if the heat pump fails, according to Viva Training. Intergas should copy what Daikin do, they both use the same boilers, it's just the rest of the system that's different.
Do you also love oil boilers?
Very interesting, I wonder if this would work with my opentherm viessmann vitodens 100-w then.
Yes it would
Intersting to find how this hybrid could work with Vaillant boilers which have only Ebus and not OpenTherm
It wouldn’t. But vaillant heat pumps would work with vaillant boilers. I toyed with the idea of doing it at my own place, but probably will not bother anymore and remove gas all together
You can pickup a VR33 Ebus to opentherm module from Europe. Note this will void will void the warranty for UK vaillant boilers!
@@Saaj2if valiant voided your warranty for installing that I suggest you take them to small claims court and get them to justify that.
So from 11 months ao have they updated the software to allow the boiler to work if heat pump does not work
@UrbanPlumbers Would love an update, more in depth info on the software would be great if possible, a walk through on how to configure for peak, and off peak electricity costs for example ?
Love your videos - installed Intergas Xclusive 36 -which is great - as a Combi in Jan (after watching your vids)and this unit wasn’t available in uk at the time
In Oct installed 2x Toshiba Haori 4kw air to air units One for the Lounge 20ft by 15ft and the other for the same size bedroom above (total of five double rads now not used) Gas savings seem to exceed the cost to run Haori units Plus once we are in the lounge /bedroom in the evening the boiler can be turned off or on at a lower temp- early days yet but impressed so far
Plus aircon in the summer if required
Kind of the same idea as video 🤔😂
How about using it with an oil boiler
Yeah, that should be possible
I have the same system in my house with 2 buffer vessels.
Can I have a combi with a 3kw immersion on smart controls. When elec is cheaper than gas it switches.
heating with direct electricity, even at a cheaper tariff is never cheaper than gas. At best the same.
Thought long and hard about ashp last year ,but the quotes i was receiving were a laugh. A new gas bolier for 2400 won the day.😂
Ultimately I'd like something similar but a back boiler on the wood stove going to a buffer to boost an air source heat pump. Not sure if it's possible or something anyone will agree too fit!
Better buy a solar System for warm water in the no heating decade . No heating Pump. 👍🇩🇪. Use this System since 1995.
I don't really like the idea of this tbh. The heat pump doesn't seem very good compared to other modern heat pumps that can work at very low temperatures. Surely it would be better to just have a decent heat pump, then you can get rid of gas and not pay the standing charge, not have two things to break down, and not have any direct carbon footprint from your heating.
Definitely this - so much misinformation about heat pumps.
It seems like a good idea to make the boiler and heatpump work in conjunction with one another, but is it really?
The boiler needs to run when the heatpump can't provide enough flow temperature or the COP is getting too low, right? I think you can replace the "or" with "and" in this statement: as long as the heat demand is low enough to keep the COP above a certain treshold the flow temperature won't need to be maxed out to meet that demand, but when the heat demand goes beyond what the heatpump can deliver the COP will also drop because of the low outside temperature.
So I believe in most cases, it will either be beneficial to run purely on the heatpump or purely on the boiler, with only very few circumstances justifying the use of both at the same time for heating. Hard-switching between the two sources and using valves to prevent both pumps acting on eachother seems like a much more efficient idea than insisting on the possibility of running both at the same time and needing a buffer to counteract the downsides of that setup, no?
Can't that copper CCT or what's it called be replaced with a one-way valve?
Any news on the Vaillant customer who wanted to add the hybrid Heat Pump?
there is a hybrid from Vaillant. The question is if you are eligible for the heat pump grant....?
@@giorgosa no, you can't sadly. It was planned on an earlier video.
Surely putting it through a buffer makes it a normal hybrid system? I.E you could do it with any boiler or Heatpump?
Still doesn’t need a cylinder and has all the functionality of controlling the tariffs and cop
@@UrbanPlumbersyeah good point about the cylinder. Shame the government don’t incorporate it in to the BUS grant.
Probably going to be incorporated I would guess.@@deanchapple1
I really like this ideea, but in the end is it worth the difference in investment cost, taking into account that you get a less reliable system due to the complications brought to the system (useful by the way) and all this in the name of saving the environment?
wouldn't it be easier to be less aggressive/sporty at the wheel to compensate by far for the climate difference? I pay about 3 times more for gasoline than for heating the house... and I think I would pollute less if I learned to drive more calmly...
does this system recuperate the warm exhaust from the gas boiler? (blow the exhaust through the heat pump condenser if not)
No
Pretty sure boiler exhaust is corrosive to most materials
I suspect the mass flow from the boiler exhaust is a small percentage of the mass flow through the ASHP and is not worth the engineering cost to effect this.
It's more sensible to connect to a low loss header/buffer than use a CCT if head is too great on the pump of one unit and the CCT is too close to a unit. Generally try to avoid CCT on systems with multiple inputs because of it.
Can you explain why this is the case. I've not seen any issue related to your statement.
The main issue i see is that as soon as it drops below zero the ASHP frosts up and the COP drops through the floor. This is the exact time you need the highest output from your heating and the ASHP can't do that. A boiler can regardless of external temperatures.
That’s why a hybrid is a good idea
By no means do I know a lot about this but I can imagine it could be a thing that would get people away from buying larger then necessary heat pumps for the few days in winter where it may not be as efficient. Especially if they already have a boiler. I even wonder if you could have an apartment building with small heat pumps for the flats and then a gas boiler at the basement so that you could run the smallest possible (and cheapest) heat pumps knowing that there is a backup.
Seconded. Even when we're not talking about flats, there are newly built houses (I'm in the UK) with no obvious space for a big water tank. Having the combi boiler for domestic hot water and some sort of hybrid system for central heating appeals to me, especially because I'm getting credit on the electric bill during the months when solar generation is higher.
I like that it can potentially be added to any OpenTherm Gas Boiler.
Why not use electronic valves instead of a CCT surely that's the simplest solution?
Not withstanding the lack of BUS Scheme Grant in the UK, unfortunately based on the current price of Gas v Electricity you would need a SCOP of 3.5-4 for it to be financially viable.
Using a setup like that shown ie. Combi Boiler + Hybrid HP wouldn't it be best to run a two HW Cylinder setup? eg. One that combines a HW Cylinder and a Buffer Tank in a single unit?
Surely, ultimately, it's more beneficial to run the HP to raise the temp of the water to 35' and then fire the Gas Boiler to raise it to 50-55'c?
Depends on cost and your current boiler. If you've got solar panels already it could be a winner, especially if you don't use a lot of hot water and don't want a cylinder
Would the gas boiler not just cycle very inefficiently?
I think it would be better with a buffer. With the poor modulation associated with the intergas boiler a buffer would help to control the excessive output
@ 2:59 by the way you are dressed, it can be seen that you also "like" working in the cold ... and you tell me in one comment that I complain when I say that it is not suitable for me to sit still outside for 1-5 hours in front of a heat pump to diagnose what defect it has
How much would that whole system cost?
Why install one heating system, when you can install two 💰
there is at least one silver lining. If one heating system fails, you have at least got a back up heating system that can take over.
Just go with a Cold Climate ASHP? It's not even cold in England. Could be nice for Northern Canada though!
What is the rule to match heat sources kW in hybrid system ? 12 kW heat loss is 12 kW gas boiler and 12 kW heat pump ?
thank you , sorted out . Regards
I wonder what the initial investment is like?
@ 2:00 Open therm? Alpha(Immergas) + Vaillant + other brands will take their boilers to the church to not get the open therm deamon 😂 … i had to buy a special module from Holland (mentioned by you in another video 😅) to connect a Nest thermostat to a Vaillant Gas boiler 😂 …
Looks like the NRG ZONE manifold needed.
Why not just add a ASHP in series with the gas/petrol boiler network and have the boiler pump run all the time? ASHP can work with temperatures above 2C and boiler for lower outdoor temperatures. As a retrofit mostly but as a new system as well. Too much controls?
Finally a solution to electric only back up. Heat pumps might take off now.
Heat geak elite?😊
Intergas do the same thing but without that other internal unit.. its just internal gas boiler and outside heat pump...
It was piped up as, flow out of heat pump, into return of boiler. Out of flow in boiler around heat emitters then return back to heat pump return...
What would that whole system cost? Boiler heat pump and all the other gubbins.
You were discussing reducing your carbon footprint... And then a few minutes later show us how the gas boiler is used to heat an open-air swimming pool! 🤪
Use a heat pump for pool !
You also aren't reducing your carbon footprint if using lots of electricity from the grid.
You realise how good the Vaillant heat pumps are when they rate them at -7 not plus 7!
More to go wrong and a gas supply including standing charge is still needed.
The Xtend is too small, to meet most demands and also access funding.
From my understanding you won't get gov. funding through mcs unless the ASHP meets the full heat loss now in Scotland, even for hybrids (except in extenuating circumstances) So only having 5 Kw available, (3 at sub zero temps?) is a bit small & limited for the majority of houses up here...
And most won't install without funding...
its a perfect size for a hybrid. We acutally need more sub 5kW / -2 heat pums. There aren't almost any.
@ 8:19 me too …
Why would anyone use the most complicated, unuser friendly system ever?????
Keep it simple for all those users that don’t have thousands to spend and just want some heat and hot water????
15 years, that’s amazing, better off with a bbu
Good way of reducing your carbon footprint only if you have a stupidly big house and you have money to throw away
Get real, what about the millions of people that live in a small house in a little village that isn’t part of London
No BUS grant, be more interesting once it’s finished
Just looks overly complicated and a massive turn off as a potential ASHP customer. I would rather have a well designed ASHP system. I am sure their are use cases but I just don't see it.
Agree. Plus, if you're only using it for a couple of cold days, you're still facing additional cost. First you have the upfront costs. And additionally you have the fix cost for the gas line and the chimney sweeper. I can't see how you will ever save money with this. But it's probably appealing to people who have heatpump anxiety.
System pump should pump away from the expansion tank. Because it's before the line with the expansion tank, the system pump wants to pump into the gas boiler instead of through the system.
The refrigerant lines here don't look brilliantly installed, and it is a shame to see the indoor unit connected with flare fittings rather than a solid brazed connection. Possibly more installer friendly this way, but in the world of professional air conditioning installs, you see less and less flare fittings on unit connections as they represent a potential leak point.
I imagine adding split refrigerant circuits to a heating system will lead to hugely increased risk of accidental refrigerant discharge where the knowledge and expertise of those servicing / repairing the heating system has to catch up to overlap with that of refrigeration. When you get an installed base of such units (and don't get me wrong, they look like an excellent development when some of the hydraulic kinks are worked out), it will be important that they are maintained by people who are clueful not to disturb the refrigeration side of the system unless they are trained and qualified (and competent) to do so. Brazed unit connections on the refrigeration side would remove a potential risk point.
Just out of curiosity, what refrigerant is this system running? Do you know if the unit is reversible (so it can defrost the outdoor unit by pulling heat from the hydraulic circuit).
pretty much every residential split system across the planet uses flared fittings at both ends...
Mmhhh, I'm not sold on this. Seems a bit like hybrid cars:- twice the complexity. If a heat pump can't get a property up to temperature it should not be installed. ICE cars make more sense in some applications, and BEV's make more sense in others. The main benefit of a heat pump in my eyes is to be able to get rid of the gas meter and save the standing charges on gas mains supply....
So to reduce your carbon foot print you installed a swimming pool.
Hey - it’s a carbon neutral swimming pool, behave 🤣
The Xtend system does not offer total redundancy (boiler fails, heat pump will still heat the house/DHW and vice versa). You would be foolish to install this system in its current state.
@ 10:30 Not that good of an ideea …
+ you are ruining the heat pump efficency ….
To much complexity less gas but more electric?
@ 1:15 this is a very basic performing heat pump … it looks like a generic brand from China relabeled…
Alpha(Immergas) brand of boilers ar doing @ the same thing…
Who makes it for intergas ? It’s not much of a solution for anything when it’s only 5kw. Not impressed at all. Very poor compared to the rest of the market
I am afraid I don’t know.
My house only needs 3kW so would work great here. Most houses 🏡 n the UK are 6kw. Almost all new builds will be below 5kw.
It looks very "Daikin" to me. Pretty sure I read the Alpha hybrid heat pump is a custom daikin too.
@BenIsInSweden could be anything. Feels like aircon unit adapted for heating. I like the fact that it’s only 3kW at -2. Could do my house without cycling
If your heat pump can cover all heating loads than you don’t need a hybrid. Surely the point of a hybrid is to put a small heat pump in that can do a lot of the load most of the time and then let the gas pick up when demand goes up.
Or, if you only need 5kw, buy a decent (german) heatpump that can still produce 45C water till - 15C and 65C with - 7C, there are brands that can do this and still have a COP of around 3,5 to 4,5...
I have 5kw unit running with much higher cops than that 😀
I'm a bit biased, but indeed, a Stiebel can produce 65C @ - 15C for heating, 75C for hot water with a decent cop and scop
@@UrbanPlumbers what cop is yours running at?
I got some running well over 5 and almost none below 4. I have installed around 20 in the last 12 months
Europe gets the good shit lol
In other words ASHP are still not suitable for all and GAS boilers need to do the heavy lifting. save your money and just install a gas combi and accept UK is not part of any global warming problem.
Eh... of course it's a part. Consumerism is seldom talked about with the GHG stats.
Actually it's the heat pump that will do the majority of the heavy lifting here. And good luck with ignoring global warming!
@@andrewcunningham1 As if heat pumps are the answer to any global warming! Good luck wasting all ya money on the latest scam
Co2 is not a pollutant, it’s not toxic to the local environment or indeed anyone, it is however one of the global warming gases, it affects at a global level. I wish people paid attention at school.
Yes just put your fingers in your ears and close your eyes and all is well. Good luck with that!
So in a nut shell spend £££ just to reduce your C.F but not save any money. Stick to NG as long as you can until something else arises.
It may not matter to you but it does matter to quite a few people
Pointless as you won’t get the £7.5k grant. Rather than add complexity just spend the difference on insulation.
Surreal. We have an existing gas boiler that works effectively on its own to heat the house. Then an additional expense is incurred to install a heat pump which the installer admits won't work on its own so the existing gas boiler remains to help it out. 🤡🌍
That set up lowers your running cost and carbon emissions and allows you the time to get the house fully ready for removal of gas. I believe in Nederlands where this set up is made, you can’t install gas boilers without it anymore
Guess you don’t have access to solar pv and off peak electric tariffs!
That look like a terrible setup. At least the alpha one works. They are not bothered about their carbon footprint with a swimming pool in the garden. 😂
The alpha hybrid is one of the worst hybrid setups out there.
@@BristolHeatPumps the alpha one works, this one is a comedy sketch. Daikin one seems to work ok, anything but this. Let’s try and reduce our carbon while heating our pool 😂
It’s a decent set up and very popular in Netherlands - that Alpha is not even close.
@@AllenHart999 what do you classify as “works” pretty broad range. If your talking about it being a good stepping stone into renewables and putting it against other manufacturers hybrid options its an absolute shambles.
@BristolHeatPumps radiators get hot mate - it works !
Why not cut out the middleman and just use a gas boiler ?
Sounds like heat pumps then are not good enough to be able to do the job on it’s own so needs a backup, heat pumps are relatively new so is it because they are new they are not as efficient as what we’re told , all I hear about heat pumps is they are 160% more efficient than gas boilers and I’ve heard from some experts they are 400% more efficient , sorry for using the word expert especially after the lockdowns scenario the word expert would be used with a warning sticker.
Not at all, there are plenty of heat pumps out there that can handle it all on its own. This is more of a compromise of not having to do as much in the way of upgrades to rads etc, and utilising the combi boiler for DHW forgoing needing a cylinder. Heat Pumps aren't new either, they are fairly new to the UK, but in other countries, they have been used for decades, proving their efficiency.
@@BenIsInSweden Are they less expensive in other countries not only the purchase price but the cost of running them , the information that I’ve heard be it correct or incorrect is they are expensive to run even though they are more efficient, with electric being four time more expensive than gas and that was the electric company who said that , I find it somewhat amusing all those who are trying to go green with getting a heat pump are still paying 15 % of their bill for the green agenda, one would think taking the 15% off would generate more interest in purchasing a heat pump, sounds like a Black Adder scenario go green and still pay 15 % for the green agenda.
@@KavanOBrien cost of the actual units is similar. Running costs depends on a few factors, like last December due to a series of unfortunate events, I was paying around 60p/kWh for electricity. Even with electricity being 4x more expensive than gas, a properly installed heat pump will for the most part be cheaper to run. However, I don't see electricity always being 4x the cost of gas in the UK, especially considering more people are taking up solar and battery storage.
@@BenIsInSweden yet the price of electricity is going up 5% in January 2024 , even those who do go for solar and battery storage are still paying 15 % of their bill for the green agenda, talk about dying is easy comedy is hard, imagine someone having solar battery and heat pump they will still pay the 15% green agenda tax = comedy on steroids , don’t know why nobody talks about small domestic wind turbines, would like to see one small wind turbine go against a solar panel to see which is more efficient most days and nights are windy yet solar only power the battery when the sun decides to get up.
Three times the install cost and a maintenance headache for no benefit over a gas boiler? No thanks!
Much lower maintenance as boiler has to work less. Lower running costs. I’ve weather compensated heating. No breaks in heating with DHW demand. Much lower carbon emission. Much lower energy issue. Much more efficient overall system, but yeah - keep your head in the sand