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JamesPa
JamesPa
@jamespa
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Joined: Apr 3, 2023
Last seen: Oct 10, 2026
Profile Activity
Topics: 27 / Replies: 5480
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RE: Replacing my 18 month old ASHP

@trebor12345 As you can see the community is discussing ideas on how you might best control this system. I have been reading the user manual. You h...

11 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: 10kw heat pump run in 24*7 data?

I didn't know about that history. With the modern trend towards retrofitting UFH this means that we can expect a whole slew of failed heating install...

11 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Replacing my 18 month old ASHP

@bontwoody Given your experience from your previous house and given op has a 8kW heat pump for possibly a 2.5- 3.5kW house which takes 18hrs to co...

11 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Replacing my 18 month old ASHP

Thats really helpful. The plot produced is odd and to me smacks of flow temp reduction triggered by a control not by defrost. The temperature soon r...

11 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Replacing my 18 month old ASHP

Good. No need to apologise, despite the fact that the principles of heating are extremely simple, the wide variety of houses and the constantly varyi...

11 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Replacing my 18 month old ASHP

All noted. I can see whats happening but the drop in FT appears to occur just before the start of the plot and the onset of defrost, so is not obvio...

11 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Replacing my 18 month old ASHP

The problem is that you need to modulate down to <1kW because thats where the temperature sits most of the time. You wont find a heat pump or a bo...

11 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Replacing my 18 month old ASHP

Whatever you are experiencing in terms of house temperature is not, IMHO, going away 'simply' by getting another heat pump, and is likely to get even ...

11 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Replacing my 18 month old ASHP

I am far from convinced this will fix the problem because there isnt much out there < about 4kW, so not that much difference. I think there is a ...

11 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Replacing my 18 month old ASHP

Yes, but the lowest power heat pump you will get is ~5kW, so its still going to be cycling. A boiler will be much worse. Thus getting to grips with ...

11 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Replacing my 18 month old ASHP

ok that makes more sense, in which case simplicity of UI is going to be key if you do change! I can recommend Vaillant for this because I have one, b...

11 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Replacing my 18 month old ASHP

Welcome to the forum. Some things you are saying dont make sense together One of the reasons you want to replace it is because its oversized, yet t...

11 months ago
Forum
Air Source Heat Pumps (ASHPs)
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