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JamesPa
@jamespa
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Illustrious Member
Joined: Apr 3, 2023
Last seen: Sep 17, 2025
Profile Activity
Topics: 17 / Replies: 2865
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RE: Secondary pump speed - how much slower should it be?

Agree, although in the UK, at least according to my understanding, this would have to be demountable via double check valves etc (assuming its effecti...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Avoid the Heat Pump Villain: Why Low-Loss Headers and Buffers Can Sabotage Your Heat Pump's Efficiency

The principal reason that LLH reduces efficiency is if there is a temperature drop flow to flow across it (which there almost inevitably is unless it ...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Navigating the World of Refrigerants In Heat Pumps: A Guide for Homeowners

The charge is specified, typically 1-3kW. Your view has always been my view, nice if you can get low GWP but, by comparison with the savings due to a...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Navigating the World of Refrigerants In Heat Pumps: A Guide for Homeowners

The only practical downside (from a consumer point of view) of R290 appears to be its flammability and hence location constraints. Meanwhile we happi...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Navigating the World of Refrigerants In Heat Pumps: A Guide for Homeowners

@hughf Is the second assertion (R290 = Less efficient) actually true? Here are extracts from the spec sheets for Mitsubishi R32 and Vaillant R290,...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: To zone or not to zone?

I think the problem OP has is that some rooms get too hot while others remain cold. My assumption is that the solar gain doesn't happen every...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: To zone or not 2 zone!

My initial reactions are this. I don't know where you are in the country but 14kW is quite high for 240sq m suggesting some insulation might hel...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: New ASHP system - choices

According to heat geek 10mm is good for 1.1kW at DT 5. The heat geek figures are for copper I think, plastic will be a bit less (bit there again you...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: New ASHP system - choices

Therein lies the problem. I would ask them questions about the system they insist on before paying for the survey. Or just tell them you won't accep...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: New ASHP system - choices

I think I would go for the installer that doesn't want to Fit a unit that is far too big (I agree 12kW is well oversized, based on the very limi...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Secondary pump speed - how much slower should it be?

Correct It would be better to connect the radiator return to top right, leave the ASHP return bottom left, then plug the remaining two ports. Th...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Secondary pump speed - how much slower should it be?

Having read your follow up question and the answer from @derek-m , it suggests you follow the route which both @derek-m and I suggested. Replumb buff...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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