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JamesPa
@jamespa
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Illustrious Member
Joined: Apr 3, 2023
Last seen: Sep 13, 2025
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Topics: 17 / Replies: 2842
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RE: Simulation of ASHP with Gas boiler as part of decision process

Whilst this may be true I don't think we can be certain of that conclusion based on your one example. You are not comparing apples with apples. Yo...

12 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Simulation of ASHP with Gas boiler as part of decision process

@cathoderay Winter 23/24 was milder than 22/23. Previously you multiplied input energy by SCOP, whereas in fact it should be multiplied by COP. I...

12 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Antifreeze Valves

Indeed. Several of the manufacturer installation guides I have read say that freeze protection must be fitted. Installers tend to cling to what the ...

12 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Simulation of ASHP with Gas boiler as part of decision process

Thanks. (I think you have probably provided the explanation for the apparently anomalous consumption (10MWh vs ~24MWh which would be expected for a 1...

12 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Simulation of ASHP with Gas boiler as part of decision process

I agree with the first sentiment, I was being provocative. Practically speaking one can download smart meter readings and degree days. These should...

12 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Simulation of ASHP with Gas boiler as part of decision process

@cathoderay Since you are convinced (and have sone evidence) that your house heat loss is 12kW, let's take that as read and see where it takes ...

12 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Simulation of ASHP with Gas boiler as part of decision process

I think people, including me, do this simulation exercise as a bit of a sense check and to ascertain how low temperature heating affects their comfort...

12 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Simulation of ASHP with Gas boiler as part of decision process

Thanks. One more question, what is the source of your electricity meter readings and do they include anything other than the heat pump?

12 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Simulation of ASHP with Gas boiler as part of decision process

I do remember the discussion. It would be interesting, at least for me, to try to rationalise the figures. I suspect multiple factors may be in pla...

12 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Simulation of ASHP with Gas boiler as part of decision process

No problem. Something doesn't make sense and it would be good to get to the bottom of it. The divide by 2000 approach (open university says 2200) ...

12 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Simulation of ASHP with Gas boiler as part of decision process

Thanks. I am sorry that, with multiple simultaneous threads, I can't remember everything! How quickly and how much did your house cool when you wer...

12 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Simulation of ASHP with Gas boiler as part of decision process

Not doubting the data, just trying to reconcile your oil consumption with your heat pump consumption whilst assuming your house loss has remained the ...

12 months ago
Forum
Air Source Heat Pumps (ASHPs)
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