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cathodeRay
cathodeRay
@cathoderay
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Illustrious Member
Joined: Feb 28, 2022
Last seen: Sep 15, 2025
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Topics: 17 / Replies: 2132
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Reply
RE: Simulation of ASHP with Gas boiler as part of decision process

I agree. I've found the thread - appropriately enough called 'A conundrum...' - where I raised this question before. It may have been before you joine...

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

Will give an answer tomorrow, probably not very detailed, as my time using oil for CH is but a dim glow in the far distance that gets smaller with eve...

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

As I said in the original post that had the chart, it came from the setback discussion thread, and if you look at the title of the chart, it is data f...

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

Hopefully my immediate past post has clarified things. The previous discussion started if I recall correctly precisely because there was a discrepancy...

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

We discussed this at length before, some time ago, and something has changed: the way I heat my house, going from timed oil CH to mostly (sometimes I ...

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

I'm actually doing better than that. The chart has thousands of data points, and the ('trend') line in effect averages/summarises all those data point...

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

@jamespa - @jamespa - you are still avoiding my question! Is it not the case that the divide by 2000 rough rule of thumb can give very misleading resu...

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