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Last seen: Sep 20, 2026
... particularly if you have TRVs and zone valves randomly switching on and off, which may well have been part of the 'justification' for the buffer t...
1022kWh here, 200sq m detached 1930s property with piecemeal fabric improvements, loss ~7kW @-2. Figure is from the (Vaillant) heat pump itself not i...
You don't say where you are, but I checked the climate for January in central England Jan 2024 vs Jan 2025. Jan 2025 was significantly (16%) colder...
designer is talking rubbish. See page 14 of this document It sounds like its moving in the right direction. TRVs may not have the same effect ...
Just use antifreeze valves instead of glycol, then there cant be an issue.
MCS spec for bedrooms is actually 18C. Its quite difficult for an installer to balance radiators properly because it takes a long time. If you post...
Glad to hear that you are pleased with the heating of your house and generally happy. It may well be that there is scope for a bit of optimisation of...
Similar really, rads 5C lower than output of ASHP = 10-15% penalty. Difference of 2C on the return possibly a measurement error. I think @toodles mig...
OK, so 41.9 in from heat pump, 37.1 out to rads, drop of 5C = 10-15% efficiency penalty. Not sure how the return to the heat pump is higher than the ...
To the final question yes. If the HP is delivering 43 and through to rads its 37, then you are losing about 12-20% in efficiency as a result of the...
If the rads are sized correctly then I would normally say that it could (most probably, but not certainly, is) be an emitter balancing issue. However...
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Degrees of Separation
Latest Posts
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The positive reviews keep coming in for Britain's Heat ...
By Mars , 41 minutes 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 , 5 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 , 1 day ago
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RE: Starting Our Heat Pump Journey: 1962 build 3 bed detached house
@ian-s I wouldn't be too concerned about the design ...
By Rob of York , 1 day 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 , 1 day ago
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RE: Grant R290 DHW Cycle Interuption
It looks like some sort of short pre-run. The question...
By JamesPa , 1 day 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 , 1 day ago
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RE: Why are ASHP installs so expensive?
Posted by: @batpred There´s another aspect that coul...
By Rob of York , 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 , 2 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 , 2 days ago
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RE: Heat Pump deployment statistics: June 2026
@l8again Unfortunately the government is, I suspect,...
By JamesPa , 2 days ago
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My feed of random industrial auctions turned up this au...
By Prunus , 2 days ago
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We’ve just passed 20 million forum views! 🎉
It's official. The Renewable Heating Hub forums have of...
By Mars , 3 days ago
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RE: Who's your electricity provider and what's your tariff?
@batpred When the raw material input has increased in c...
By Papahuhu , 5 days ago
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