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JamesPa
@jamespa
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Illustrious Member
Joined: Apr 3, 2023
Last seen: Sep 18, 2025
Profile Activity
Topics: 17 / Replies: 2866
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RE: Avoid the Heat Pump Villain: Why Low-Loss Headers and Buffers Can Sabotage Your Heat Pump's Efficiency

But why (bother with a secondary pump and llh) in a typical domestic install? Does anyone actually know a reason that stands up to scrutiny? I am n...

1 year 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

Which simply begs the question - why do I want primary and secondary pumps in the first place (which incidentally must be balanced for the LLH to work...

1 year 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

True, but it appears they are frequently not balanced. My questions to @abernyte (or anyone else) is: In a domestic installation of a 'normal' sc...

1 year 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

Agreed Surely an LLH suffers from mixing of flow and return to the same extent, probably more because its smaller, than a buffer does, and like a...

1 year ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Air Source Heat Pump Policies – MCS Planning Standards

I did similar, plus a couple of other points. I also sent them an email with the same matters (reproduced below). I doubt that they will do anythi...

1 year 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 cynic in me says this is about reducing call-outs & guaranteeing adequate volume for defrost. From a customer POV, as well as having the pote...

1 year ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Air source heat pump planning permission

I have experience of not getting pp and have followed a lot if what others have said. In summary: It depends entirely on your lpa. Some, like min...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Anyone installed a 12kw Samsung gen7 that is 0.07 over the permitted development rules?

Yes that's quite normal. And the 'advice' may be quite unhelpful in my limited experience, basically a load of backside covering telling things you c...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Anyone installed a 12kw Samsung gen7 that is 0.07 over the permitted development rules?

Unless your LPA can issue some extra-statutory concession (they do have some considerable discretion when it comes to enforcement) then the mechanism ...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Installing your own ASHP

Hence why I added 'Of course, if nobody is likely to complain, you may well choose to ignore this.' Lots of minor developments are done which need p...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Installing your own ASHP

Just bear in mind that permitted development rights apply only to installations by an MCS contractor to MCS standards (a closed shop by regulation whi...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Why Your MCS-Certified Installer Might Not Be As Competent As You Think

Ideally you are right. But we don't live in an ideal world. Our existing workforce is our existing workforce and expecting to transform its skill se...

2 years ago
Forum
Government Schemes, Regulations, Planning & Organisations
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