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Air Source Heat Pumps (ASHPs)
Last Post by batalto 3 years ago
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 batalto
(@batalto)
Famed Member Member
Joined: 4 years ago
Posts: 1091
10/01/2022 12:20 pm  

No bills yet - apparently I'll get December and January together, lovely. The below might be of interest to people. The ambient is the 24hr average as an FYI

image
image

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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 heat-pump-newbie
(@heat-pump-newbie)
Reputable Member Member
Joined: 4 years ago
Posts: 170
10/01/2022 12:52 pm  

@batalto What are you using to get the average ambient temperature ? 



   
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 batalto
(@batalto)
Famed Member Member
Joined: 4 years ago
Posts: 1091
10/01/2022 2:02 pm  

@heat-pump-newbie the heat pump gives it to me a statistic along side power use, heat delivered etc. I assume its just the average temperature across the day


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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 Jon-C
(@jon-c)
Eminent Member Contributor
Joined: 5 years ago
Posts: 9
11/01/2022 11:38 pm  

Hmm, Mars - "2.39 MWh ... this December it would have cost us a staggering £526."

Think I'll check my figures:

300m2 Chalet Bungalow, 12kW ASHP, 30 Amp Storage AGA and wood burner in lounge.

December Energy usage: Day 1132 kWh, Night 1752 kWh, Total 2.89MWh.

Current Fixed Rate (24p/9.5p per kWh) = £438

Best Big 6 Fixed Rate now (44p/23p per kWh) = £902

 

Yep, very scary !!



   
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 batalto
(@batalto)
Famed Member Member
Joined: 4 years ago
Posts: 1091
12/01/2022 12:03 am  

@jon-c just had a look on a comparison site. 8.5p/KW for gas is the lowest price and 29p/KW for electricity. Ouch. Still, that's a cop of 3.4 if you wanted to switch to a heat pump...


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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 Kev M
(@kev-m)
Famed Member Member
Joined: 5 years ago
Posts: 1276
12/01/2022 9:33 am  
Posted by: @jon-c

Hmm, Mars - "2.39 MWh ... this December it would have cost us a staggering £526."

Think I'll check my figures:

300m2 Chalet Bungalow, 12kW ASHP, 30 Amp Storage AGA and wood burner in lounge.

December Energy usage: Day 1132 kWh, Night 1752 kWh, Total 2.89MWh.

Current Fixed Rate (24p/9.5p per kWh) = £438

Best Big 6 Fixed Rate now (44p/23p per kWh) = £902

 

Yep, very scary !!

Jon,

we had a 30 amp night storage Aga when we moved in and it was nice but very expensive to run. We just couldn't justify it so it had to go.

Kev 


This post was modified 4 years ago by Kev M

   
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Mars
 Mars
(@editor)
Illustrious Member Admin
Joined: 5 years ago
Posts: 3420
13/01/2022 9:19 am  

@kev-m, what was your heat pump usage in December?


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 Kev M
(@kev-m)
Famed Member Member
Joined: 5 years ago
Posts: 1276
13/01/2022 9:39 am  

@editor 

747kWh for heating.  That's £152.  I'm happy enough with the kWh, not so much the £!



   
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Mars
 Mars
(@editor)
Illustrious Member Admin
Joined: 5 years ago
Posts: 3420
13/01/2022 9:56 am  

@kev-m, that's very satisfactory. That would have been around £76 this time last year with Symbio. But still very good. 

 


Pre-order: The Ultimate Guide to Heat Pumps

Subscribe and follow our Homeowners’ Q&A heat pump podcast


   
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 witchcraft
(@witchcraft)
Reputable Member Contributor
Joined: 4 years ago
Posts: 91
13/01/2022 11:38 am  

@julianc

1224kWh here for our largish 4 bed house (which also housed four 20 somethings over Christmas fortnight as well as us) in total for Dec including the ASHP, plug in hybrid car (Golf GTE fantastic!), etc.  ASHP is a 12kW Vaillant Arotherm plus with a SCOP of 2.5 inc DHW of which we made lots looking after the young people.



   
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JulianC
 JulianC
(@julianc)
Noble Member Member
Joined: 5 years ago
Posts: 332
13/01/2022 2:52 pm  

Similar @witchcraft we used 1179kWh 10th Dec to 9th Jan. 234kWh was on my cheapest overnight tariff when I heat hot water, run the dishwasher and charge the EVs

Approx 705kWh of the total were from the Daikin ASHP.

So I was happy with this. My MCS predicted ASHP usage is 54kWh per day for January. I am well below this. 


Daikin Altherma 3H HT 12kWh ASHP with Mixergy h/w cylinder; 4kW solar PV with Solic 200 electric diverter; Honda e and new Hyundai Ioniq 5 N electric vehicles with Myenergi Zappi mk1 charger


   
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 Peterr
(@peterr)
Estimable Member Member
Joined: 4 years ago
Posts: 67
14/01/2022 1:56 pm  

Still battling with our installer to get our MMSP sorted out so having to guess a bit about our ASHP usage, but overall usage for our 240m2 3-storey house was 1290kWh + a measly 90kWh from solar PV (lowest we've ever had for December by quite a long way).

Previous 6 years average for grid + solar, pre ASHP install, was 604kWh, so as a rough estimate we used 776kWh on heating.  This assumes zero solar PV export, which is probably not quite the case, but our iBoost would have used most of the excess, so it should be fairly close.

Wishing we could also get our smart meter to actually connect to the metering grid, then we might be able to look for a lower overnight tariff, but we're currently on a fixed rate of 20p/kWh (until October), which, given the current state of the market I'm not complaining about!



   
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