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Johnmo
@johnmo
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Noble Member
Joined: Jan 25, 2023
Last seen: May 23, 2025
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Topics: 2 / Replies: 535
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RE: Simulation of ASHP with Gas boiler as part of decision process

Back to the original question Simulation using a gas boiler - looks like a good chance of sh*te in - sh*te out, if you are not careful. Not sure the...

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

You said the above, your chart stops at 4.5, if it was 12 that would make sense. So confused by you saying 12kW and the 300% efficiency statement????

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

He multiple gas kW by CoP (off 3) 4x3, so 12kW.

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

I really would not do that, if your heating is working leave it. 1. You boiler may not like it or cope with dT5. 2. If you mess up and you need h...

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

See my post above - you don't need 12kW.

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

Be careful with that assumption - why The CoP includes many things a gas boiler efficiency doesn't. A gas boiler doesn't include any electric inputs...

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

Mostly depends on your circulation pump head losses etc. from pipe length and number of bends etc. There are ways around things. Buffers are looked as...

8 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 take advantage of the £7500 grant, you are subject to MCS calculation methods, so simulation or otherwise is pretty much a waste of tim...

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

But that isn't the best way to run a heat pump. Weather compensation run 24/7 and if you need a very small nighttime setback of a couple of degrees on...

8 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Balancing financial efficiency and comfort using the Octopus Cosy tariff

So some observations A setback or off period your heat pump will have to play catchup at the end of that period to replace the energy lost. But the...

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

Not correct, if you use inhibitors or glycol then VDI 2035 is not applicable to your system. You are using a different system. My heat pump instructio...

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

Think you need a lot of hours to cause any issues. There is an article on here suggesting 12 or hours in a freezer. A slow drip overnight is quit...

8 months ago
Forum
Air Source Heat Pumps (ASHPs)
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