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JamesPa
@jamespa
Moderator
Illustrious Member
Joined: Apr 3, 2023
Last seen: Aug 26, 2025
Profile Activity
Topics: 17 / Replies: 2701
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RE: Heat pump's integral circulator pump

Interesting Have you got some examples/evidence you can point to. So far my Vaillant 7kW operated 24x7 open zone no buffer tank is working out 13% ...

6 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: new kitchen no walls free, will fan coil units work?

I have one Mitsubishi wall mounted fan coil in my otherwise all radiator ASHP system, installed because a passive radiator wouldn't fit. It's in the r...

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

That is true, there are the most efficient ways to run a heat pump, although not always the cheapest because ToU tarrifs can distort the picture. ...

6 months ago
Forum
Introductions, Forum Rules & Updates
Reply
RE: Heat pump's integral circulator pump

Thanks for this, good (and useful) analysis! As a matter of interest where did you see that statement, the one I saw (which appears to be bor...

6 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Optimising DHW in summer (once heating season ends)

Unless you use negligible hot water the energy used by the compressor will dominate, the water pump will be negligible. So you should optimise for th...

6 months ago
Forum
Domestic Hot Water & Cylinders
Reply
RE: Say hello and introduce yourself

Welcome to the forum and please feel free to ask as many questions as you need to, no question is 'stupid'. If you havent already can I suggest you r...

6 months ago
Forum
Introductions, Forum Rules & Updates
Reply
RE: What is the maximum output of the Vaillant 7kW Arotherm Plus

There is a table here showing figures generally well above 7kW /p> However there has been recent speculation that these figures are gross output and...

6 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Heat pump's integral circulator pump

I am not sure what assumptions you think I am making in my analysis of what we know so far about whether there is anything 'magic' about a 5C DT flow-...

6 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Forum updates, announcements & issues

Or someone is watching the woke in preparation for the right wing takeover to come.

6 months ago
Forum
Introductions, Forum Rules & Updates
Reply
RE: High air source heat pump running costs – Vaillant AroTherm Plus

!C drop across the buffer is small, and might cause an efficiency degradation of ~3%. But 2C flow to return is also small so was this at a time when ...

6 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Forum updates, announcements & issues

really? Im not sure if thats encouraging or scary.

6 months ago
Forum
Introductions, Forum Rules & Updates
Reply
RE: buffer/volumizer cupboard space eater, do i need one?

Not sure this is precisely what happens or how the control loop works. What I observe on plots I have seen (including mine) is that the flow temperat...

6 months ago
Forum
Air Source Heat Pumps (ASHPs)
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