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Heatgeek
@heatgeek
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Joined: Dec 16, 2024
Last seen: May 29, 2025
Profile Activity
Topics: 1 / Replies: 116
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Reply
RE: Heat pump's integral circulator pump

@ubert767 File is attached. My explanation may be a bit unclear. My HP only turns off when all stats turn off, otherwise the flow modulates above ...

11 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Heat pump's integral circulator pump

@ubert767 You have a UFH system and house size similar to mine except I have a Samsung Gen 4 Split 4kW. You were wise and chose a split system which i...

11 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Controversial opinions - pure weather compensation, buffer tank, heat loss, oversized heat pumps

@sunandair This new Ecodan validates your argument about following WC closely for maximum efficiency. You can now set your design flow and radiator si...

11 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Controversial opinions - pure weather compensation, buffer tank, heat loss, oversized heat pumps

@jamespa Quoted performance figures @35C flow, -7C OAT = 8.2kW and @25C flow, 15C OAT = 2.1kW. Quite something. Other output models as well.

11 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Controversial opinions - pure weather compensation, buffer tank, heat loss, oversized heat pumps

@jamespa I agree. That is where the design choices come in. You have to design within the constraints imposed on you, realistic or not.

11 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Controversial opinions - pure weather compensation, buffer tank, heat loss, oversized heat pumps

@jamespa It is all about design choices. In my view heating at extreme low end temperatures is a small minority of overall heating which might not eve...

11 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Controversial opinions - pure weather compensation, buffer tank, heat loss, oversized heat pumps

@sunandair Posted by: @sunandair "If the weather curve is set correctly then the house envelope will never reach the set temperature and therefor...

11 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Controversial opinions - pure weather compensation, buffer tank, heat loss, oversized heat pumps

@sunandair I think I understand what you are getting at with “widest range”. This is not an easy dilemma. You are right about radiator over-size at 15...

11 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Controversial opinions - pure weather compensation, buffer tank, heat loss, oversized heat pumps

@sunandair Regarding radiators, UFH and WC, system design can have some quirks. Say one designs for the following:i) -3C design temperature with a mat...

11 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Controversial opinions - pure weather compensation, buffer tank, heat loss, oversized heat pumps

@uk_pete_2000 I am now totally confused how your minimum output 6kW heat pump is coping with <3kW load without serious cycling, but never mind. R...

11 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Controversial opinions - pure weather compensation, buffer tank, heat loss, oversized heat pumps

@uk_pete_2000 In the light of this discussion, could you maybe share what is happening on your system as you have a 13kW heat pump in a low-loss passi...

11 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Controversial opinions - pure weather compensation, buffer tank, heat loss, oversized heat pumps

@uk_pete_2000 Your u-values stack up with the amount of insulation installed. I presume therefore that you also have MVHR. As the peak heat load is wa...

11 months ago
Forum
Air Source Heat Pumps (ASHPs)
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