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Last seen: Sep 21, 2026
Yes sorry £1 per day is what I meant. 1K per kWh is a figure I have seen quoted more than once for a 'professional' install. £160 per kWh changes t...
Emissivity certainly comes into it but is not strictly the whole story - because radiators aren't predominantly radiators, they are predominantly conv...
Yes with reservations. If the house cools materially during the 'off' period then the average IAT will be lower than the 'target' IAT and so the amou...
No. The amount of heat lost/gained by conduction/convection will be dependent on the surface roughness and the nature of the medium in which it is im...
@judith , @larry , @cathoderay Collecting the above together with my comments and those from @cathoderay A room by room fabric spreadshe...
Im not entirely sure what this comment is intended to convey. My analysis is as follows - there are various ways of getting at essentially t...
It is this averaged over 24hrs. The reason I think that the daily averaging is useful is that it distinguishes days when its cold all day from iso...
try/p> If you have a smart meter you have, or at worse your energy supplier has, half hourly gas meter readings. That's pretty close to energy i...
Which is pretty good I would say The only check I would want to do is plot daily energy against degree days. There is a risk that plotting instanta...
@majordennisbloodnok @cathoderay As I say above the major issue with any short term measurement is the heat capacity of the house which will, i...
An equilibrium state is pretty much spot on, because it means that the fabric of the house will neither absorb nor emit energy, which means you are me...
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Latest Posts
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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 , 4 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 , 6 hours ago
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Depends on what controls the pump! Thats the whole poi...
By JamesPa , 11 hours ago
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The positive reviews keep coming in for Britain's Heat ...
By Mars , 1 day 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 , 1 day 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 , 2 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 , 2 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 , 2 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 , 2 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 , 3 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 , 3 days ago
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RE: Heat Pump deployment statistics: June 2026
@l8again Unfortunately the government is, I suspect,...
By JamesPa , 3 days ago
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My feed of random industrial auctions turned up this au...
By Prunus , 3 days ago
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