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JamesPa

@jamespa

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Illustrious Member

Joined: Apr 3, 2023
Last seen: Sep 16, 2025

Topics: 17 / Replies: 2861

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RE: Avoid the Heat Pump Villain: Why Low-Loss Headers and Buffers Can Sabotage Your Heat Pump's Efficiency

Doesn't the effect on cycling depend on how the water pump is controlled. If the pump (secondary in the case of a buffer tank, only in the case of a ...

1 year ago

Forum

Air Source Heat Pumps (ASHPs)

RE: Avoid the Heat Pump Villain: Why Low-Loss Headers and Buffers Can Sabotage Your Heat Pump's Efficiency

As far as I am aware short cycling can be cured just as effectively by a volumiser as opposed to a buffer tank. Volumisers dont depend on accurate co...

1 year ago

Forum

Air Source Heat Pumps (ASHPs)

RE: Avoid the Heat Pump Villain: Why Low-Loss Headers and Buffers Can Sabotage Your Heat Pump's Efficiency

Pretty much but worth unpacking for absolute clarity Yes! Exactly, Heat loss from rad to room is dependent on average flow temp through the...

1 year ago

Forum

Air Source Heat Pumps (ASHPs)

RE: Avoid the Heat Pump Villain: Why Low-Loss Headers and Buffers Can Sabotage Your Heat Pump's Efficiency

Interesting, but the question remains, why bother with a buffer in a typical domestic installation. Granted if you have another source of heating it ...

1 year ago

Forum

Air Source Heat Pumps (ASHPs)

RE: Avoid the Heat Pump Villain: Why Low-Loss Headers and Buffers Can Sabotage Your Heat Pump's Efficiency

@judith Derek has explained it technically, just to add for the avoidance of doubt - it simply is not true to suggest that adding a LLH can overcome...

1 year ago

Forum

Air Source Heat Pumps (ASHPs)

RE: Avoid the Heat Pump Villain: Why Low-Loss Headers and Buffers Can Sabotage Your Heat Pump's Efficiency

I fear you are right. However the reason suggested (which is very plausible) is the equivalent of dressing a dirty wound instead of first cleaning it...

1 year ago

Forum

Air Source Heat Pumps (ASHPs)

RE: Avoid the Heat Pump Villain: Why Low-Loss Headers and Buffers Can Sabotage Your Heat Pump's Efficiency

Wow that's inventive but I'm sure you agree that it can be discarded as a legitimate reason. Perhaps we ought to ask why should they be included rat...

1 year ago

Forum

Air Source Heat Pumps (ASHPs)

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)

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)

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)

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

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