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cathodeRay
cathodeRay
@cathoderay
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Joined: Feb 28, 2022
Last seen: Aug 28, 2025
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Topics: 17 / Replies: 2076
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RE: ÀSHP heat loss - how close to perfect can we get?

Living in a listed building, I attach a lot of importance to aesthetics, but I also have another constraint, limited wall space. Not only are the room...

10 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: ÀSHP heat loss - how close to perfect can we get?

But equally you need to have radiators that will put out enough heat at your heat pump's flow temperature, otherwise on cold days your house will be c...

10 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: What to look for when reviewing ASHP running stats?

Maybe start by plotting the data, and looking at the patterns? If you post the plots here, I am sure we can comment. For a start, you will be able to ...

10 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: ÀSHP heat loss - how close to perfect can we get?

I should really leave this to others better qualified than me to comment on R290, but I can say that P1 and K1 rads have much lower output than K2s an...

10 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: ÀSHP heat loss - how close to perfect can we get?

Indeed, onwards and upwards! This is almost certainly a factor in my case, see the SPAB report mentioned earlier. The spreadsheet model used U va...

10 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: ÀSHP heat loss - how close to perfect can we get?

Thanks for posting this. R squared 0.92, pretty good. Looks like around 240kWh at around -3 degrees C OAT, or 10kW power rating. Probably just ...

10 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: ÀSHP heat loss - how close to perfect can we get?

If many gas boilers can do true WC, ie no room stat interference, even less excuse not to do a trail in WC mode! For the record, how do gas boilers ...

10 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: ÀSHP heat loss - how close to perfect can we get?

@jamespa - your heat pump selection logic makes sense, and I also get the importance of aesthetics. This thread now demonstrates a fossil fuel boiler ...

10 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: ÀSHP heat loss - how close to perfect can we get?

@jamespa - an interesting chart, it shows the method working for a large fossil fuel data set. I suspect if you cleaned up the data a bit, you might g...

10 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: MCS 2.0 - Changes in January 2025

But in an elevator?

10 months ago
Forum
Government Schemes, Regulations, Planning & Organisations
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RE: ÀSHP heat loss - how close to perfect can we get?

Which is why I have tried plotting 24 hour periods rather hourly periods, and sure enough the correlation does appear to be very good, remarkably good...

10 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: ÀSHP heat loss - how close to perfect can we get?

@jamespa - you know I do! You can't have forgotten the many discussions we and others have had about it, some of which have got rather warm on occasio...

11 months ago
Forum
Air Source Heat Pumps (ASHPs)
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