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JamesPa
@jamespa
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Illustrious Member
Joined: Apr 3, 2023
Last seen: Sep 15, 2025
Profile Activity
Topics: 17 / Replies: 2855
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RE: ASHP - a few (probably dumb) questions about the lived experience

I don't doubt its feasible, however there is extra cost and (physical) volume. Many modern heat pumps are pushing the 0.6cu m permitted development l...

12 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: ASHP - a few (probably dumb) questions about the lived experience

You are correct that ToU tarrifs, and more sophisticated tarrifs still, will further complicate the situation and exactly one of the things that Homel...

12 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: ASHP - a few (probably dumb) questions about the lived experience

@majordennisbloodnok @davidalgarve @bontwoody @cathoderay @toodles @mikeh (and anyone else I have missed out) thanks for the good natured and producti...

12 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: ASHP - a few (probably dumb) questions about the lived experience

Apart from the slur on engineers/physicists (I have a degree in physics and spent the first part of my working life in engineering), I agree with almo...

12 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: ASHP - a few (probably dumb) questions about the lived experience

I agree with the first point entirely. As to 'do I have any evidence that money rather than comfort is the primary driver' then I would say yes some...

12 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: ASHP - a few (probably dumb) questions about the lived experience

@bontwoody In truth it is a very widely held misconception, whether we are talking about boilers or heat pumps, that turning off the heating for (sa...

12 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: ASHP - a few (probably dumb) questions about the lived experience

Agree (assuming that 'draw' in the second sentence should read 'deliver'). So in the second instance at COP=4.5, 81kWh would be delivered for 12k...

12 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: ASHP - a few (probably dumb) questions about the lived experience

Referring to the above Im going to try to clear up some basics, with apologies to any physicists or engineers reading! Firstly energy is measured (f...

12 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: ASHP - a few (probably dumb) questions about the lived experience

If oversized then it is indeed quite possible that an overnight setback will save energy, because you are reducing the inherent inefficiency of cyclin...

12 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: ASHP - a few (probably dumb) questions about the lived experience

If the energy is delivered at cop4 is xkWh then you must supply x/4kWh. If the same amount of energy is delivered at cop 6 you must supply x/6kWh. I...

12 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: ASHP - a few (probably dumb) questions about the lived experience

Er no, you are confusing power and energy. You pay for energy not power. If 24kWh is required then the input energy is 24/cop. So if the cop is 6...

12 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: ASHP - a few (probably dumb) questions about the lived experience

Sorry but that is simply not true and worse still is quite seriously misleading. Whilst the heating is off the house continues to lose heat. It l...

12 months ago
Forum
Air Source Heat Pumps (ASHPs)
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