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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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I've just finished reading BHPSS, @editor, and I can se...
By Majordennisbloodnok , 1 hour ago
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RE: Heat Pump deployment statistics: June 2026
IMHO its not unachievable, but it wont be achieved with...
By JamesPa , 1 hour ago
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RE: Missing flow temperature in Heat Geek proposal
That calculation is reasonable, output is proportional ...
By JamesPa , 1 hour ago
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RE: Recommendations in Ely (Cambs) area for Full setup checks on Nibe HP setup for House.
Have you looked at the Nibe website? They list their ap...
By Lizzie , 2 hours ago
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RE: Why are ASHP installs so expensive?
A not unreasonable position and it wouldn’t be mandator...
By AndrewJ , 2 hours ago
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RE: Who's your electricity provider and what's your tariff?
@batpred When the raw material input has increased in c...
By Papahuhu , 2 days ago
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We kept ours and Heat Geek would have been in touch if ...
By Batpred , 2 days ago
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RE: Starting Our Heat Pump Journey: 1962 build 3 bed detached house
@ian-s I would encourage you to have a conversation ...
By Rob of York , 2 days ago
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RE: Is it the house or the equipment?
Thanks @jamespa The last hard to fix draughts in the...
By springswood , 2 days ago
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RE: Vaillant Arotherm – Using Heating
@l8again Mine is typically using 11w including the i...
By Batpred , 2 days ago
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RE: Next steps on my ASHP journey: Radiators and Pipework
If you have a flowmeter and two temperature probes, the...
By bobflux , 3 days ago
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RE: Siting of the external sensor on a heatpump
@jamespa Absolutely. Even if the same mistake was mad...
By Batpred , 3 days ago
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RE: Navigating the World of Refrigerants In Heat Pumps: A Guide for Homeowners
Indeed we are invvestigating AC at present and are havi...
By Toodles , 5 days ago
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