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Last seen: Sep 21, 2026
Can you post your mathematics and all the data you used? Even things like how you ran the oil heating eg always on or timed? Was the indoor air temper...
@ian33a — a tricky one. Any or all of your hunches may be correct. Can you get the raw data Installers B and C used for their fabric heat losses, and ...
A very good point. In effect, the DHW pipework is an emitter, and very likely not a trivial one, given the figures @jon has previously posted. Maybe w...
@jon — thanks for posting the revised chart, I hope you agree it looks cleaner, and so also less confusing, with same sized blobs. It goes without s...
@jamespa — this chart is indeed suspect, it suggests the energy delivered at low OATs flat lines, which is highly unlikely - unless perhaps some sort ...
@jon — I think you may already have a good estimate of the heat loss, and it is in, or rather can be derived from, this chart: F...
A bit more on ERA5 gridding: This is the size (but not as I understand it the boundaries, the lines are actual lat/long and the ...
Yes, I got that, but it also has dispersed data. Suppose you live in Guildford, which weather station do you use, and how much credibility do you give...
Yes, but @jon used ERA5 data, which is based on NWP modelling. I'm not sure we know how well the modelled outside air temperature (OAT) corresponded ...
I have at least answered my question about the ERA5 data gridding: it is 'regridded', at a horizontal resolution of 0.25° x 0.25° lat/long or 17 x 11 ...
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Degrees of Separation
Latest Posts
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RE: Starting Our Heat Pump Journey: 1962 build 3 bed detached house
Posted by: @ian-s The bigger item think is do we upgr...
By Rob of York , 35 minutes ago
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RE: Why are ASHP installs so expensive?
And then you look at US electricity prices and weep.
By bornagain , 59 minutes ago
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Depends on what controls the pump! Thats the whole poi...
By JamesPa , 6 hours ago
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The positive reviews keep coming in for Britain's Heat ...
By Mars , 20 hours 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 , 24 hours 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...
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RE: Heat Pump deployment statistics: June 2026
@l8again Unfortunately the government is, I suspect,...
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My feed of random industrial auctions turned up this au...
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We’ve just passed 20 million forum views! 🎉
It's official. The Renewable Heating Hub forums have of...
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