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JamesPa
@jamespa
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Illustrious Member
Joined: Apr 3, 2023
Last seen: Sep 20, 2025
Profile Activity
Topics: 17 / Replies: 2879
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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)
Reply
RE: Secondary pump speed - how much slower should it be?

I think where we are at is that a buffer tank can be made to work (but it's by no means guaranteed that it will have been set up properly) but its not...

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

Maybe not on a mainstream channel! Perhaps 5 minutes on rip-off Britain.

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

I confess I see the HT heat pump question is a bit of a side issue. The question really is, do 'lt' heat pumps have any advantages ove HT ones. The ...

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

Interesting. Is the research which led to this sponsored by the fossil fuel industry I wonder? Obviously we all need the facts, but there is a big w...

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

I have to stress that I don't actually know what it does as I don't have one, only that it does something. It looks like you have found some detail f...

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

Basically what this is saying is that, if the water pump contained within the heat pump isn't strong enough for the job (because your heating system h...

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

@marzipan71 In the diagram they look and are piped like a buffer tank (an LLH is, in effect, just a small buffer tank afaik). So far as I can tell ...

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

@iancalderbank Re-reading the thread on buildhub I refer to above I think I am now both confused and a little embarrassed. I thought that the con...

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

I will be quite frank and admit that your questions had me re-evaluating my assumptions. I will have to look back a long way on the buildhub forum (...

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

Sorry on my reading it does. I quote ... "So when you are in a low load condition you get this issue:... The flow slows down and the unit trips out...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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