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cathodeRay
cathodeRay
@cathoderay
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Joined: Feb 28, 2022
Last seen: Sep 22, 2025
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Topics: 17 / Replies: 2163
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Reply
RE: Installing a heat pump in a Grade II listed property

@showi - thank you, that is very kind of you! We are, like Sisyphus, condemned to roll this ball forever! I will get back to you tomorrow.

11 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Installing a heat pump in a Grade II listed property

There has indeed been a lot of discussion about whether setbacks save money and/or compromise comfort, including this mega-thread. The answer is not s...

11 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Real world connection to a heat pump over modbus

Part 3: Hardware Installation After a barely excusable delay, I return to an account of how I set up my wired modbus connection to my heat pump, whi...

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

11 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...

11 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 ...

11 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...

11 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...

11 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 ...

11 months ago
Forum
Air Source Heat Pumps (ASHPs)
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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 ...

11 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 ...

11 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...

11 months ago
Forum
Air Source Heat Pumps (ASHPs)
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