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Last seen: May 29, 2025
@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 ...
@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...
@sunandair This new Ecodan validates your argument about following WC closely for maximum efficiency. You can now set your design flow and radiator si...
@jamespa Quoted performance figures @35C flow, -7C OAT = 8.2kW and @25C flow, 15C OAT = 2.1kW. Quite something. Other output models as well.
@jamespa I agree. That is where the design choices come in. You have to design within the constraints imposed on you, realistic or not.
@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...
@sunandair Posted by: @sunandair "If the weather curve is set correctly then the house envelope will never reach the set temperature and therefor...
@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...
@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...
@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...
@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...
@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...
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Degrees of Separation
Latest Posts
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Coming back on subject... A shortened version of the ...
By Transparent , 59 minutes ago
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RE: Boiler Upgrade Scheme funding reduced by circa £750 million in 2026 budget
Yeah, great catch. So this will reduce the total number...
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RE: The Changing Jet Stream Could Challenge UK Air Source Heat Pumps
@susannasaunders When you come to get quotes for A2A...
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RE: Say hello and introduce yourself
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RE: Marvel Heating liquidation
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RE: Vaillant ecoTEC Plus - Flow Temp and Set Up
JamesPa The chart explains well how the heat curve an...
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RE: Free app: run the immersion / heat pump from Growatt battery & solar surplus – no Home Assistant
Please bear in mind, everyone, that in order to use thi...
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RE: The good, the bad and the not that great – my heat pump installation
@burtis Thanks for posting this and Im so pleased you ...
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RE: I need help with Ecodan ASHP
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RE: 15kw pump for 225m2 1990's house - over kill?
@seaviews your installer would be right to say that the...
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RE: Tradespeople on Their Phones: What’s Acceptable When They’re Working in Your Home?
Actually, that's a very important point. I've only ev...
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RE: Aerotherm and weather compensation
These are likely inked. The basic explanation is tha...
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RE: Electrical works for air to air heat pump
agree with above. I have not had extra costs added wh...
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Good to hear that you found a solution. Absolutely a...
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