Heat Pump Hot Water System vs Gas Hot Water
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- Опубликовано: 1 ноя 2022
- Comparing gas hot system to a heat pump hot water system before I install a Reclaim 415L heat pump hot water system at home in Sydney Australia to utilise my excess solar energy.
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Forgot to mention solar hot water. That's not a thing here any more. It was big in the 1980's, but hardly anyone here installs it any more.
Imagine if you could have the refrigerant for your hot water heat pump plumbed into your split system for the summer in a setup like the multi split - Keeping cold whilst you heat your water.😀😀 that would be supreme efficiency.
If you have a lot of excess solar it’s worth adding resistive hot water into the comparison. The cheaper capex compared to heatpump might more than make up for the higher opex if it’s all solar anyway.
The heat pump manufacturers have their calculations based on a 20C outside temperature, when you have 0C outside in the winter it's not so efficient, so I hope it helps in your setup. But do not be surprised if suddenly you don't save money
People in the UK get heat pumps installed and they are really bad and expensive compare to gas. Seems like a scam.
You have "muddied the waters" a bit in your comparison by converting your MJ usage to electrical KWH costs right away, and then calculating your cost in the price of electrical KWH, without calculating your ACTUAL cost of the natural gas MJ's you used to begin with, and thereby changing your actual cost per day, ( or breaking it down from your providers billing statement for those cycles). According to Google, the avg price cost of natural gas in Australia in Mar 2022 was 0.070 U.S. Dollar per kWh. 3200 MJ's converts to 30.337 Therms (100 cubic foot units) Your claim of 889 KWH converts to 30.341 Therms, which closely agrees with the 30.337 Calculation above. The avg cost of natural gas in AUS in Mar 2022 was $0.07 USD / per KWH ( Per Google) , which multiplies out to $62.23 USD, multiplied by today's conversion rate of AUS /USD of 1.58/1 = $98.32 AUS D, divided by 94 days = $1.05 AUS D per day, not counting any delivery fee, pipeline maint fees, tariffs taxes, ect. This is QUITE a bit different from your calculated $1.54 AUS D / day, but it also cannot be argued that the cost of natural gas, and it's delivery, is going to constantly increase over the years, and you do directly benefit from converting your solar power to the task of heating your water. The bottom line, is, SHOW US THE GAS BILLS!!
415 liters? That's 91 gallons. That's twice the size of my water heater which happily serves a family of four! They want quite a lot more money here for larger systems.
I am using my heat pump for floor heating in my house. I never wanna go back!
At a crappy rental I lived at our hot water system used 15KWh per day it had a 5KW element that ran for 3 hours a day. Turns out the shower the landlord refused to fix was leaking hot water in the wall. They tried to pin it on us untill I proved I raised it as a maintenance issue on our first inspection 9 months earlier. The massive power bills didn't hurt so much when their refusal to fix anything resulted in a foundation sinking....
Your stovetop is currently better at heating water than your water heater... A 1000W stovetop element (the smaller one) can heat 20L of water on average in about 33 minutes. That means it's using 0.5KWH for a 5 minute shower's worth of hot water. Lets say that's a family of 5... that's 2.5KWH / 100L for showers.... I'm pretty sure you don't need 10KWH to heat the remaining 75L....
I have the Sanden 250l heat pump hot water system (same technology as the Reclaim) installed last August. It runs at midday for 2 hours on the solar energy and consumes 1.1kWh.
I got a 300L tank with an integrated heat pump about 3 years ago replacing a resistive heating tank. I'd say the average COP around the year works out at about 3. I'm off grid in the UK at 53N so the sun only gets to 14 degrees altitude at winter solstice and it made a big difference in how often I had to run the generator to keep the batteries topped up.
I helped to put one in on my sister's farm NE of Perth about 6 years ago, has worked great without a hiccup since.
In Canada put in a ground source heat pump, went from $3000 propane to $300 electricity. With grants payback was 8 years.
Was talking about this locally and everyone thought I had 3 heads. Thanks for vindicating me! 🎉
I'm definitely interested in this without a doubt! This year I bought qty 40 240 watt solar panels, 15k in LiFePO4 batteries and 2 all in one inverters because I could see energy costs going up. I spent $1.21 per gallon on propane 2 years ago & $1.29 per gallon last year. This year with shopping around to 5 different vendors in my area got it for $2.18 per gallon. So with what I've seen in costs going up I'm doing everything I can to supplement my energy needs with solar solutions. I think a heat pump hot water might be just another way to do exactly that. Thanks for the great vids my friend, and I look forward to more 😁
We came from a regular resistive water heater in our place and went with a same-sized heat pump. Cut energy usage from hot water anywhere from 1/3-1/4 the amount the resistive heater used. I have what I consider to be almost the best case usage for one. My water heater sits in my garage, so it doesn't cool the house (Units here in the US are combined units as opposed to what I'm going to call the 'mini split' style Dave is showing), and I live in the southeastern US, so there is plenty of heat in my garage to pump into the water. Ours is a 'hybrid' that also has normal resistive elements in case you need fast recovery or something happens to the heat pump system, but you have the option of locking those out and not using them, which I have.
Have a heat pump, had it for 2 years now, still grid tied, and in south africa, we have serious power issues, so being able to have hot water , running off a small generator is a huge bonus! but when we do have power from the grid, it barely uses power!
We have a 50 gallon or 189 liter heat pump hot water heater and it works flawlessly! So far in 2022 it has used $206 USD and 803kWh. There are two of us living in a 1920 sq ft or 178 sq m house and we do have guests every so often. We've bought it in 2018 for the same price as a standard electric water heater due to an instant rebate from our local power company and never run out of hot water.