Last seen: Apr 30, 2025
@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...
@uk_pete_2000 I think we have some misunderstandings here. You previously indicated that you have a passive house (<10W/m2 or ~5kW peak loss) but i...
Latest Posts
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@iantelescope - I do appreciate I am becoming something...
By cathodeRay , 16 minutes ago
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@ashp-bobba The service contract is with Daikin Service...
By Toodles , 2 hours ago
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RE: Potentially more choice including air to air heat pump grants
@jeff Such documents are far too wordy for my ‘daily re...
By Toodles , 2 hours ago
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RE: Renewables & Heat Pumps in the News
Lol... thanks to @judith I cracked and gave the Spanish...
By Lucia , 7 hours ago
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RE: Getting the best out of a heat pump - is Homely a possible answer?
@grahaml I cannot agree that it is a small percentage o...
By benson , 21 hours ago
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RE: Warm weather and heat pumps.
You’re welcome @lucia - thanks for watching. I’ve alway...
By Mars , 22 hours ago
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RE: Commencing on an ASHP Installation Process
In that case treating it as a separate space seems emin...
By JamesPa , 1 day ago
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RE: Yes, the "zoning with ASHP" topic again...
This aspect of control is a bit variable from manufactu...
By JamesPa , 1 day ago
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RE: Samsung Gen6 16kW tribulations
@emceed, can you please give us an update on your syste...
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RE: ASHP Ecodan L9 error - No Heating but Hot Water
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RE: Solar Power Output – Let’s Compare Generation Figures
@editor Well last MAY i know was not the greatest for s...
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What's the problem you are trying to solve. The answer...
By JamesPa , 4 days ago
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Good luck. For what it is worth my system was very def...
By JamesPa , 4 days ago
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RE: Massive Electricity Cost for Running My Air Source Heat Pump
I agree @mark-h The Building Regs are now very readable...
By Transparent , 5 days ago
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RE: Help me understand my Mitsubishi Ecodan system
@carpenterstation When changing settings in the ser...
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RE: Ecodan Legionella cycle - immersion heater problem
Thanks for letting us know @clockworks I admire your ...
By Transparent , 6 days ago
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RE: Revised version of MCS-020 (noise standards for heat pumps)
As you say this is no change, which I personally think ...
By JamesPa , 6 days ago
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RE: What happens when the outside temperature exceeds the upper WC point?
@editor not via the WC curve but as @old_scientist ment...
By bontwoody , 7 days ago
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RE: MHHS and Heat Pump compatibility
@toodles to be clear I don't know if there will be a re...
By Scalextrix , 7 days ago
