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Prunus · 2022-01-07T16:50:44Z

Thought it would be good to start a thread about what people’s ASHPs actually consumed in electricity. Obviously lots of variables, but good to have some hard data, especially now it’s winter time. Here’s my whole house readings for 7 Dec 2021 to 6 Jan 2022: For a 13kW Grant Aerona3 in a 125m2 semi detached chalet bungalow (with a very draughty loft conversion) in Cambridgeshire. Base load of other electrical appliances probably 12-14kWh depending on use of the tumble dryer. The first week may be slightly too high as things weren’t set up right, but otherwise the ASHP is taking maybe 3kWh on a mild day and 25-30kWh on a freezing one. How do your numbers compare?

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Air Source Heat Pumps (ASHPs)

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Biketrials1

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18/01/2022 8:31 pm

@majordennisbloodnok

something to compare to as same ashp but a bit smaller UFH mine is 84m2 and 3 Rads and 3 tower rails in jersey CI

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Majordennisbloodnok

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19/01/2022 7:46 am

@biketrails, it looks to me as if you're getting a COP of about 4 on the day with the greatest energy consumption (so, I would assume, the coldest day). Does that fit with your overall monthly figures? If so, that seems to me very good indeed.

105 m2 bungalow in South East England
Mitsubishi Ecodan 8.5 kW air source heat pump
18 x 360W solar panels
1 x 6 kW GroWatt battery and SPH5000 inverter
1 x Myenergi Zappi
1 x VW ID3
Raised beds for home-grown veg and chickens for eggs

"Semper in excretia; sumus solum profundum variat"

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Mars

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19/01/2022 9:54 am

@biketrials1, those are solid numbers. What heat make and size do you have?

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Jeff

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19/01/2022 10:25 am

Electricity is cheaper than gas per unit on Jersey at the moment

Very different model to the UK. Only 1 electricity and 1 gas supplier.

Gas is very expensive vs UK.

They have very long hedging on their electricity so relatively little impact on their electricity prices so far. Completely different model to the UK. Lower than our price cap for electricity at the moment.

My partner looked into a job over there recently.

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Biketrials1

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19/01/2022 7:48 pm

@jeff. yes ours eletric is cheaper but i stiil dont think its cheap enough 😀 🤣 🤣 . we have a traiff of just like UK but also one to suite ASHP called economi Plus mean 20 at 11.41p and the other 4 at normal rates at 16.31 was 10.97 and 15.60 but has gone up this year not to sure wot gas is but definetely more.

@editor. i have ecodan 8.5kw with 210L preplumb cylinder but i have added 90L gedhill buffer tank and remove the low loss header as i see no point in having 2 mixing point. i had to have buffer tank because i have overlay underfloor heating with 12mm pipe around 84m2 with 4 rads and 3 tower rails with heatmiser room stat to turn on and off witrh weather compensation. i think thats the results above but sense i have been reading on this fourm have learn alot and now trying out weather compensation with all stat turn all the way up and flow turn all the way down runing 24/7 should have result for next month but for some reason my ecodan enegy monitor had not update for a week now, just stop working on controler or melcloud.

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Majordennisbloodnok

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02/03/2022 4:27 pm

OK, time for an update.

The month of February has seen our ASHP use 553.2 kWh and produce 2050, giving a COP of 3.7. During the same period, the solar PV has produced 264.7 kWh. At our current electricity rate of 22p/15p, that's a distinct saving on our previous oil consumption even before solar energy production taken into account.

"Semper in excretia; sumus solum profundum variat"

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batalto

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22/03/2022 11:35 am

Just putting my bill here for people (20th Feb - 20th Mar)

12kW Midea ASHP - 8.4kw solar - 29kWh batteries
262m2 house in Hampshire
Current weather compensation: 47@-2 and 31@17
My current performance can be found - HERE
Heat pump calculator spreadsheet - HERE

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Mars

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22/03/2022 8:22 pm

That’s good @batalto, very, very good. How long are your rates locked in for?

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batalto

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22/03/2022 8:39 pm

@editor October 2022 on those rates. Then I'll have to assess - hence why I am looking at bigger batteries to try and offset the massive cost increases I'm going to get

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