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JamesPa
@jamespa
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Illustrious Member
Joined: Apr 3, 2023
Last seen: Sep 19, 2025
Profile Activity
Topics: 17 / Replies: 2877
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RE: Air source heat pump stopped generating hot water

Daikin user manual is here and it explains how to program DHW. Check its actually programmed before you pay anyone, there may well be nothing wrong. ...

1 year ago
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Air Source Heat Pumps (ASHPs)
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RE: Air source heat pump stopped generating hot water

OK, so to summarise you have A heat pump Solar PV with eddie and Harvi Solar thermal A tesla powerwall You are lucky enough to have ...

1 year ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Air source heat pump stopped generating hot water

Well that tells us that the Eddi works in manual mode (but may or may not work in divert mode) and your hp isn't heating water at all. So now the qu...

1 year ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Air source heat pump stopped generating hot water

This does sound like a settings issue, or just possibly a diverter valve issue to me. And suspiciously it sounds like your 'maintenance check' is pro...

1 year ago
Forum
Air Source Heat Pumps (ASHPs)
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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)
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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)
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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)
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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)
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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)
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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...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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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...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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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...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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