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cathodeRay
cathodeRay
@cathoderay
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Joined: Feb 28, 2022
Last seen: Sep 17, 2025
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Topics: 17 / Replies: 2149
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RE: Simulation of ASHP with Gas boiler as part of decision process

That chart shows heating energy in for my heat pump. Given an efficiency of 300%, then an energy in figure of 4 will give an energy out figure of 12. ...

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

I suspect two things are getting conflated here: (1) my demonstration of my method for using energy in/out to determine heat loss, using my heat pum...

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

No I didn't, either I have completely misled you somehow, or you are not reading my posts!

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

Pre-installation, standard heat loss calcs done by me and also separately by my installer (latter had one typo which did matter but was easily correct...

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

I'm not sure that answers my question (is the divide by 2000 rule of thumb unreliable?). You divided 16000kWh pa (current/historic fossil fuel use) by...

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

I do - see my previous post! Plus it also happens to be the figure decent heat loss calculations come up with.

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

I should have explained more. The 300% efficiency is actually based on my monitored energy in/energy out (energy out divided by energy in), and is a l...

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

I am not sure the divide fossil fuel kWh by 2000 rule of thumb works. I was going to remark 16000kWh per annum is rather on the high side, suggesting ...

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

All sound stuff apart from the TRVs - aim not to use them at all, except when you have no alternative (which should be rare, preferably never eg use t...

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

That sounds promising. Do you still have the heat loss/rad sizing calculations used to select your current rads? If you do, they may add some more inf...

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

I strongly endorse this. Some of the quotes I had from various goons claiming to be heating engineers had hopelessly out of whack rad specs. For radia...

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

I have a small old leaky listed building with limited wall space. As a very general rule of thumb, if you have correctly sized radiators for a fossil ...

12 months ago
Forum
Air Source Heat Pumps (ASHPs)
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