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HughF
@hughf
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Noble Member
Joined: May 2, 2022
Last seen: Jun 27, 2025
Profile Activity
Topics: 5 / Replies: 484
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RE: Need ASHP advice for old (1882) stable development in SW Scotland - where do I begin?

good luck convincing anyone that their radiators will never be warm to the touch... That's why I stick with 38.5 as the hot end of my WC curve - it's ...

2 years ago
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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

@toodles It is purely there to allow the heat pump to operate without any flow errors... Primary side just sits there running into the header, microbo...

2 years ago
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Air Source Heat Pumps (ASHPs)
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RE: Need ASHP advice for old (1882) stable development in SW Scotland - where do I begin?

@bontwoody indeed, although I would question the viability of having radiators that don't feel warm to the touch, from a homeowner acceptance perspect...

2 years ago
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Air Source Heat Pumps (ASHPs)
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RE: Performance in the current cold snap…

It is my suspicion too, that in milder weather, we are simply oversized. I didn't take into consideration the possibility that the ACH value used in t...

2 years ago
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Air Source Heat Pumps (ASHPs)
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RE: Need ASHP advice for old (1882) stable development in SW Scotland - where do I begin?

@heacol SCOP only needs to be 2.8 to beat gas - and that's what it's all about... not costing more than a gas boiler.

2 years ago
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Air Source Heat Pumps (ASHPs)
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RE: Performance in the current cold snap…

@jamespa flow temp.... get that accurate first, then tweak the WC curve up/down as required. Think I've got the curve vaguely correct at the moment, s...

2 years ago
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Air Source Heat Pumps (ASHPs)
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RE: Performance in the current cold snap…

@derek-m single heat pump, just run on weather comp, no stats, no setback. The Carel platform that my heat pump is built on allows full tuning of th...

2 years ago
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Air Source Heat Pumps (ASHPs)
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RE: Performance in the current cold snap…

@jamespa I’ve spent ages tweaking the P, I, and D on mine to try and get a decent response without overshoot. It’s not easy, especially when 1. We’re ...

2 years ago
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Air Source Heat Pumps (ASHPs)
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RE: Performance in the current cold snap…

On the subject of control strategy, some units can be set to control on LWT or RWT…. Mine used to be switchable between the two but a recent softwa...

2 years ago
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Air Source Heat Pumps (ASHPs)
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RE: Performance in the current cold snap…

GH has been involved in heat pump installs since the early days, he knows his stuff. He also had to come up with workarounds for flow rate issues that...

2 years ago
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Air Source Heat Pumps (ASHPs)
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RE: Grant 13kW Aerona3 - issues getting zones to temp

I’m sorry I can’t provide anything helpful, but I’m mighty glad I didn’t need a header or buffer in my install. It seems like a nightmare.

2 years ago
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Air Source Heat Pumps (ASHPs)
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RE: Daikin problem

@bontwoody scop of 3.2 is certainly achievable, but not very easily on a retrofit unless you design for 45 degree flow, maximum. With octopus (for exa...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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