Electricity use for heat pumps - comparing homes and consumption

Rad1o · 2024-02-14T12:18:19Z

Hello, We are new to heat pumps. I just want to ask for numbers to be able to compare. We live in the Midlands and had a Grant Aerona 3 17KW installed in September. Our base electricity consumption for a 5 bedroom house before heat pump installation was a stable 400 - 450 KwH per month. We had an aditional 1000KwH when the heating period started and pretty much the same for November, December and January. We keep the house at 20.5°C with only minor setbacks as the pumps struggles to catch up bigger temperature drops and when the temperature dropped to -9°C for a few days I kept the 20.5°C all day. The pump managed o.k. What kind of electricity usage do people with have?

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Air Source Heat Pumps (ASHPs)

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mjr

(@mjr)

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Joined: 4 years ago

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18/03/2024 3:56 pm

Posted by: @mike-patrick

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Many of the above , in my dreams.

2023, June 479, Nov 1,120, Dec 1,359, Jan 2024 1,491

These are total kWh per month from which you can subtract 8-10kWh per day for non-ASHP use - say 300kWh per month.

100% electric home. 10KW Grant Aerona, 3 bed detached (150 sqm), mixture of cavity wall insulated new build and internally insulated original stone, double glazed, UFH no radiators. 20c heating. ASHP left on same settings 24/7. UFH off during summer months, 2 occupiers.

How old's your home?

2023 Nov 608, Dec 690; 2024 Jan 886, Feb 564

100% electric 1990ish home, 8.5kW Mitsubishi Ecodan, 4 bed semi (128 m² IIRC), injected cavity wall insulation, double glazed, all radiators, 20c heating (give or take a degree), ASHP set back to 18c overnight, heating does its own thing so rarely on in summer, 2 occupiers.

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newhouse87

(@newhouse87)

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Joined: 3 years ago

Posts: 231

18/03/2024 6:11 pm

242sqm new build, house 21/22. Nov Dec 2023 approx 1400kwh. Near 40% less then my first winter thanks to suggestions here, I'm setting back overnight as house retains heat well. All ufh using fixed flow temp.

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glpinxit

(@glpinxit)

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Joined: 3 years ago

Posts: 31

03/04/2024 3:11 pm

I have now posted the % comparison between measured energy consumption and the estimates provided by my Ecodan. Upthread I'd said that I would do this but you would be forgiven if you'd lost patience during the long time since!

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