Last seen: Nov 26, 2025
@trebor12345 Yes, expect defrost cycles to initiate at evaporator temperatures between -20 and -35 degC depending on refrigerant gas, plant design and...
For an air-source heat pump the minimum evaporating temperature depends on the compressor design and the manufacturer’s operating envelope. Typical...
@crimson This youtube might be of help The narrator's voice sounds kind of familiar 😂
You might want to consider the following common faults: Air in the System/Pipes (Air lock): This is the most common problem. Trapped air prevents wa...
@paultheheating How do you currently recoup the oil cost from the tenant and who pays the electricity bills? My understanding is the BUS grant is du...
@jeff The cost of an electric motor is pretty insignificant compared with cost of electricity it consumes in its operational lifetime. The cost of ins...
@jamespa I think you are right about a hotel type hot water feed. Hot water seems to return, see the secondary return shown in this section of dia...
@paullacey From the diagrams I assess you have 2 heat pumps plumbed in "tandem" but controlled in "cascade". What the second heat pump can do is the s...
@bontwoody "but after a minute the 3 way valved closed." I might be wrong but could it be a 3 port, 2 way valve with mid-position? Oper...
@grahamf To save wear and tear on the pump why could you not run weather comparison during the winter months only, and fixed temp. for the other month...
@jamespa Surely the problem will be grid undersupply i.e when the wind fails to blow just when you need it to! This is the problem that needs to ...
@jamespa or it might be related to the number of nuclear power stations closed over that time frame? Since 2008, five UK nuclear power stations have...
Latest Posts
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Hi HenriWe were puzzled by a thread being moved into he...
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RE: Electricity price predictions
@transparent The Totnes Society seems to operative l...
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RE: Grant Aerona circulation/system pump staying on
My AERONA 3 circulation pump runs constantly whatever t...
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RE: Configuring third party dongle for Ecodan local control
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Thanks, @cathoderay. I was aware of some changes to ...
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RE: British Gas vs Octopus Energy vs Heat Geek vs EDF vs Aira vs OVO vs EON.Next vs Boxt
It's buried within what has become my ongoing post-inst...
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RE: Trying to understand my Nibe F1245
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This is what I answered, I really have no hope: "......
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RE: Grant Aerona Short Cycling
@mikefl, thanks for sharing your operating data, very i...
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RE: Here is my heat pump installation with questionable COP in Italy
@jamespa Sorry for the late reply, I apologize for the ...
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RE: A2A vs A2W: Which Heat Pump Would You Pick?
@editor Yes BUT that was 3 years ago installed in Janua...
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Thanks for your response. I have UFH downstairs and ...
By GeorgeA , 2 days ago
