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JamesPa
@jamespa
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Illustrious Member
Joined: Apr 3, 2023
Last seen: Nov 5, 2025
Profile Activity
Topics: 18 / Replies: 3293
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Reply
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...

7 months ago
Forum
Introductions, Forum Rules & Updates
Reply
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...

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

7 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...

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

7 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...

7 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...

7 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...

7 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...

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

OK that rules this one out. Good! Hmm. Fundamentally of course this is down to emitter size/house loss. I'm getting the feeling from your text...

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

Sorry to hear of your problems, I have two key questions: Just to confirm what you are saying - is this what you experience (that it wont achieve ...

7 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: help sizing rads based on room by room heat loss

If its 1988W at DT 50, which is how most radiators are specified (but note not all, one brand is specified at DT70!) then yes that's right. At FT40 a...

7 months ago
Forum
Thermostats, Volumisers, Buffer Tanks, TRVs, Pumps, Piping, Valves, Radiators & Controls
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