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Heatgeek
@heatgeek
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Joined: Dec 16, 2024
Last seen: May 29, 2025
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Topics: 1 / Replies: 116
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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 ...

5 months ago
Forum
Air Source Heat Pumps (ASHPs)
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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...

5 months ago
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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...

6 months ago
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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.

6 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.

6 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...

6 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...

6 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...

6 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...

6 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...

6 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 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...

6 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 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...

6 months ago
Forum
Air Source Heat Pumps (ASHPs)
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