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JamesPa
@jamespa
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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

Doubtless it is the case, for example if you live in an uninsulated barn heated part time, or want to run a heat pump in the same fast and furious way...

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

If this is the case and you were previously using 10MWh per annum in oil, then your heat pump is running very inefficiently not at a COP of 3, or some...

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

Agreed, so long as you average over an appropriate period, say 6-24 hrs. If you consider instant heat delivered or heat delivered over a short period...

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

How did you come to the conclusion you need 12kW (what calculation did you do?). I'm genuinely trying to understand. It doesn't prima face make much...

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

If you want to run a heat pump inefficiently then of course you will need a higher capacity. How did you come to the conclusion you need 12kW? If ...

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

Afaik there are two considerations namely pump head and water velocity (causes noise and erosion). A short piece of straight 22mm isn't going to incr...

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

Seconded. But do you reckon that the average MCS guy is going to give you the choice? My underlying issue is that we are told what we 'must' have by...

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

Posted by: @johnmo ↑ I don't really buy into the heat pump has to be perfectly sized, it has to be suitable. Getting a grossely oversized one ...

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

22mm is marginal for 8kW, or ok depending on whether you work on 1m/s max flow rate or 1.5 m/s. Are there 2*22mm (eg upstairs and downstairs) or onl...

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

I don't either, but nor do I buy into the idea that anybody should be forced to do unnecessary pipework upgrades, have an unnecessarily intrusive outd...

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

If you do this take pictures and get receipts, you may need to get to convince installers it's been done unless the insulation remains visible.

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

Precisely that. The method is based on BS something or other, I forget which, so even MCS can say it's someone else's. BS something or other is des...

12 months ago
Forum
Air Source Heat Pumps (ASHPs)
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