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Oversizing your HP by 50% is a bad idea as it will simply increase cycling and reduce efficiency as a smaller HP with be able to modulate lower. And this will have partly contributed to that very high £17K HP cost. But well done for both understanding and getting to grips with weather compensation, and experimenting with the heat curve to get it right. And I could not agree more about keeping things simple, particularly not having a buffer when they are in most cases just lowering efficiency and wasting money. Note that shutting off rooms when not used will cause the COP to be lower and the remaining rooms will struggle to reach the design temperature, though you will still probably save due to the overall house heat loss being a bit lower (it depends!) This is because the internal walls will obviously be very leaky (no internal insulation) and hence the rooms that continue to be heated will have higher heat loss to the unheated rooms and will probably be higher loss than their radiators can cope with. See Heat Geek for the mathematical details!

Wonderful video and review of the benefits of a heat pump. Great myth busting. Even my father in law with an EV keeps telling me you cant have a ASHP unless you have insulation 😉

I got an induction cooker installed about 2 years ago. I previously had an electric cooker with a ceramic top but not induction. I checked with the electrician first to see what max amps the cooker should be then searched for a number of models. (The user manual often has the details about power consumption and amps it draws and these days the manuals are online). I wanted one with proper control knobs, not touch controls. Settled for a Zanussi. It has an algorithm to manage the induction hob to make sure it doesn't exceed the max amps, so it basically does what a human would do but avoids tripping the breaker. Never actually used all 4 hob positions though, so the algorithm has never kicked in. BTW a year later my brother got rid of their gas cooker and got a Zanussi electric cooker with an induction hob installed.

You seem to be missing the depreciation of your EV.

With lower temperatures internally you have to be careful about condensation including interstitial condensation,

Very interesting video, thank you for taking the time and effort. Makes you wonder why they ever made 35kw gas boilers in the first place when a redesign could have saved us all a lot before ashp became the next option.

Good run down on an involved subject. The helicopter view of the systems that are reporting by Open Energy Monitoring Systems is that heat pumps are still being ‘oversized’ as evidenced by robust data. This is especially interesting when you consider this is a self selecting group which encompasses performance motivated designers/installers/homeowners (or the geekiest/nerdiest of professionals and consumers) - yet still oversized heat pumps. Of course there are some good reasons for that not least regeneration times for hot water cylinders but also the lack of small heat pumps for low heat loss properties.

A very thorough detailed run down. Why did you not insulate the front and rear of building as you probably could of got away with a 7kW heat pump instead of the oversize one.

Great presentation. Thank you. I am about to embark on a retrofit myself so your experience is invaluable. As far as payback period is concerned, wouldn’t it be nice to have a £ figure for the additional wellbeing felt when living in a more comfortable home. If we had a cost on living in an uncomfortable home, people would be rushing to retrofit and build better in the first place. Cheers

Hi, I'm getting a Samsung R290 heatpump installed next month with the Homely controller and OEM so I'm keen to look at your data. I can't see your heatpump listed on heatpumpmonitor, do you have a link?

Thank you so much for this video Kat. We learnt a lot from this. We have exactly the same goal & motivations and priorities as you and hope to install a heat pump in 2025. Our house was also built in 1902, is a similar size, has had a new slate roof (awful roofer!) and we are invested with Ripple. The main difference is that our house is a semi in a conservation area in east London. The side wall is our main heat loss but our local council will not allow external insulation, although having declared a climate emergency we live in hope that they will change their mind one day. Living in a terrace house means that you have two side walls that have no heat loss. We're envious! We also have followed Heat Geeks. They recommend keeping the whole house as one zone and not to control individual radiators. I am doubtful about this, unless the aim is just to achieve the highest possible COP. I noticed that you have TRVs. How do you use these? Are they just to stop rooms getting too hot? One more question. Did you have to have a separate consumer unit just for the heat pump? Fred and Miu Gray