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JamesPa
@jamespa
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Illustrious Member
Joined: Apr 3, 2023
Last seen: Nov 16, 2025
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Topics: 18 / Replies: 3385
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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 ...

1 year ago
Forum
Air Source Heat Pumps (ASHPs)
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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...

1 year ago
Forum
Air Source Heat Pumps (ASHPs)
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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...

1 year ago
Forum
Air Source Heat Pumps (ASHPs)
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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.

1 year ago
Forum
Air Source Heat Pumps (ASHPs)
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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...

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

Absolutely, with one caveat, if you have a condensing boiler which condenses all the time, ie is set up properly to run at low flow temp, then the los...

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

I think the planning inspector probably came to the same conclusion, but obviously he had to express it in legal terms! In fact mine could possibly ...

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

In fairness a year of my 2 year journey is the planning nightmare, during which I suspended looking for installers. I havent yet reached 20 installer...

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

@ianmk13 Where are you located? With this info maybe someone here can provide.a recommendation Sadly the industry appears to be riddled with gr...

1 year ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Antifreeze Valves

Do they dump all the water or do they just drip slowly? I thought it was the former but the altenic video suggests the latter. It seems to me this ...

1 year ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: British Gas versus Octopus: Two possible heat pump routes - how to evaluate them?

Problem best dealt with onsite imho. The onsite plumber will almost certainly be happy to leave you the new rad and knock off an hour early.

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

This is an area where the industry tendency to oversize can cause a real problem. I decided to start rad upgrades in advance so far for half of the ...

1 year ago
Forum
Air Source Heat Pumps (ASHPs)
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