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Last seen: Sep 18, 2026
JamesPa Could I ask for your interpretation of the defrost algorithm for the heat pump? I am seeing a defrost at around an outside starting tempera...
I did manage to find the spec on the HP and that it can only modulate down to 2.1Kw. And very few other HP on the market get much lower. I have bou...
James Thank you for your help. I will work over the next week to try and produce the data requested. This is still new to me so still a step learn...
James I understand your point about turning the heating off and on or up and down and the resulting effect. Today the one room thermostat controll...
Re the chart that I posted. Could someone comment as to why the subsequent defrost cycles do not perform as per the the first at 3.30pm?
Just to add. As the system is not that common I have been unable to find anyone local who knows anything about the system or what I can do to fix it....
Re the chart. I should of added more info. The first part of the chart shows the performance during the day with one defrost occurring at 3:40pm....
The house only requires 14watts/m2. So at -2C I only require 2.7kwh. The HP is a 7kw machine. (forgive me if have some of the annotations incorrect)...
The Thermal Off is where the temperature into the heat exchanger is too high and it shuts down because the water is too warm. Others would call this ...
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Degrees of Separation
Latest Posts
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@editor Aargh - Trustpilot. On my journey, Ì contacte...
By L8Again , 1 hour ago
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RE: Cooling with air to water heat pumps
@editor does that mean you have to have two separate ex...
By mrkfm , 11 hours ago
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RE: Starting Our Heat Pump Journey: 1962 build 3 bed detached house
Posted by: @ian-s Could always use the money saved o...
By Rob of York , 16 hours ago
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RE: Why are ASHP installs so expensive?
And then you look at US electricity prices and weep.
By bornagain , 18 hours ago
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Depends on what controls the pump! Thats the whole poi...
By JamesPa , 23 hours ago
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The positive reviews keep coming in for Britain's Heat ...
By Mars , 2 days ago
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RE: Next steps on my ASHP journey: Radiators and Pipework
I have one of these fitted which also allows you to reg...
By Old_Scientist , 2 days ago
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RE: Recommendations in Ely (Cambs) area for Full setup checks on Nibe HP setup for House.
If they can't don't give up. Heat pumps are, in reali...
By JamesPa , 3 days ago
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RE: Missing flow temperature in Heat Geek proposal
Yes that's what would happen by turning down the lsv to...
By JamesPa , 3 days ago
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RE: Grant R290 DHW Cycle Interuption
It looks like some sort of short pre-run. The question...
By JamesPa , 3 days ago
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RE: Cascade System or larger single unit
@renewables345 I would say if it a new build it’s no mo...
By Aventus Eco , 3 days ago
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RE: Say hello and introduce yourself
@gz00, welcome to the forums. There’s a huge amount of ...
By Mars , 4 days ago
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RE: Home energy storage & battery register
1 fox ess lv5200 batteries, plus 2 more waiting to be i...
By Jimcub , 4 days ago
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RE: Heat Pump deployment statistics: June 2026
@l8again Unfortunately the government is, I suspect,...
By JamesPa , 4 days ago
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