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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: 2881
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RE: Real world advice on ASHP installation - 2 18kW ASHP's recommended

As others have said 2 18kW units sounds like a massive overkill, even allowing for the overstated outputs. Someone suggested 2 16kW Mideas (which hav...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Do setbacks save energy without compromising comfort?

I would guess electronics 25-50W, pump 30-50W each. Fan is probably most of the rest. The electronics won't switch off during setback and there may ...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Do setbacks save energy without compromising comfort?

Presumably fan speed (and thus power drain) varies with compressor speed. I believe you said that your pump speed is constant and thus power consumpt...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Do setbacks save energy without compromising comfort?

I think a lot of people expect gas boilers to heat instantly, witness the prevelance of whacking the thermostat to max because they think this will so...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Do setbacks save energy without compromising comfort?

I think most, if not all, of this is spot on. Both the saving and the comfort are functions of the control strategy during recovery, and most heat pu...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Do setbacks save energy without compromising comfort?

Thanks for the vote of confidence, Im not sure its justified. I think the challenge here is that we are comparing a model in one condition with with...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: MCS consultation on amendments to PD rules

Are they heating on warm and sunny days, or is this for DHW only, or are they cooling (in which case did the planning consent cover cooling). If its ...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: MCS consultation on amendments to PD rules

I guess the authorities will say that it's covered by nuisance law which they will saw is robust. If you haven't already done so I would suggest you...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: MCS consultation on amendments to PD rules

I don't defend mcs, I have gone on record as saying that it should be abolished or at a minimum stripped of its privileged position in planning law. ...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: MCS consultation on amendments to PD rules

There is absolutely no challenge possible to the planning consent that's been correctly implemented so don't waste time. Its indeed very difficult to...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Do setbacks save energy without compromising comfort?

Heat pump efficiency declines quite markedly with low OAT, thats just the thermodynamics at work. The datasheets set it all out if you are interested...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Do setbacks save energy without compromising comfort?

Of course Im aware of that, I come across it every day. I presume that as the average is 18%, its rather more than 18% of the smaller values, and rat...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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