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JamesPa
@jamespa
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Illustrious Member
Joined: Apr 3, 2023
Last seen: Jul 17, 2025
Profile Activity
Topics: 16 / Replies: 2627
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RE: Commencing on an ASHP Installation Process

11kW does sound way over in that case! As you say it will be interesting to see what others come up with, maybe try to get a copy of the calculations...

3 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Commencing on an ASHP Installation Process

Is 116 sqm both floors, or just the footprint? If the former then 11kW sounds possibly a bit high to me. Your conservatory may be dominating however...

3 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Commencing on an ASHP Installation Process

Hi I have just posted the below in response to your intro text. ------------- In terms of getting quotes, be prepared to get a fair few to find ...

3 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Say hello and introduce yourself

Welcome to the forum. If you are new to ASHPs I suggest you read the introduction here. @editor also publishes a couple of books guiding you thro...

3 months ago
Forum
Introductions, Forum Rules & Updates
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RE: Help me keep the faith with my air source heat pump installation

I agree with @mars. My install was not dissimilar. I got a 7kW Vaillant, 200l cylinder and 4 rads (including one fancoil) for 12.5K les grant. Im...

3 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Air Source Heat Pump - Side Alley Suitability

Thats probably fair enough. The degree-days calculation (on which quite a few heating formula are based) uses the formula sum (max (Tbase-OAT ,0)) ...

3 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Air Source Heat Pump - Side Alley Suitability

Thats a slightly awkward number because, by the time you add an allowance for heating DHW, it will push you towards a 10kW machine rather than 7-8, wh...

3 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Air Source Heat Pump - Side Alley Suitability

All sounds sensible to me and to be clear, the idea of swapping to a ASHP at the same time as fixing the distribution is sound IMHO, if you are going ...

3 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Air Source Heat Pump - Side Alley Suitability

There are enough red flags in this to be concerning. I am going to keep this short, there is quite a lot to say/ask about what you have told us but I...

3 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Air Source Heat Pump - Side Alley Suitability

My installer wasn't at all keen on this option, and we had alternative location. That said Heat geek once did an experiment where they virtually surr...

3 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: In the middle of an ASHP installation - a few questions (and issues)

I don't know I checked the data resolution and its hourly. However I think this is in fact an hourly sample (by home assistant - which limits i...

3 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: In the middle of an ASHP installation - a few questions (and issues)

@benson Strange no contract as it protects them more than it protects you IMHO, ie the absence of a contract puts you in a stronger position. Pe...

3 months ago
Forum
Air Source Heat Pumps (ASHPs)
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