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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: 2851
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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)
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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)
Reply
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)
Reply
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...

12 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
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 ...

12 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
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...

12 months ago
Forum
Air Source Heat Pumps (ASHPs)
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