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JamesPa
@jamespa
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Illustrious Member
Joined: Apr 3, 2023
Last seen: Aug 22, 2025
Profile Activity
Topics: 17 / Replies: 2698
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RE: Not a good January? My heat pump used 840 KWh of electricity

1022kWh here, 200sq m detached 1930s property with piecemeal fabric improvements, loss ~7kW @-2. Figure is from the (Vaillant) heat pump itself not i...

7 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Not a good January? My heat pump used 840 KWh of electricity

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...

7 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Just one room not reaching desired temperature

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 ...

7 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Antifreeze corrosive to copper pipe rubber rings?

Just use antifreeze valves instead of glycol, then there cant be an issue.

7 months ago
Forum
Safety, Regulations, Tools, Plumbing & DIY Installations
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RE: Just one room not reaching desired temperature

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...

7 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Say hello and introduce yourself

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...

7 months ago
Forum
Introductions, Forum Rules & Updates
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RE: How To Balance Radiators & the Role of the Lockshield Valve: A Homeowner's Guide

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...

7 months ago
Forum
Thermostats, Volumisers, Buffer Tanks, TRVs, Pumps, Piping, Valves, Radiators & Controls
Reply
RE: How To Balance Radiators & the Role of the Lockshield Valve: A Homeowner's Guide

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 ...

7 months ago
Forum
Thermostats, Volumisers, Buffer Tanks, TRVs, Pumps, Piping, Valves, Radiators & Controls
Reply
RE: How To Balance Radiators & the Role of the Lockshield Valve: A Homeowner's Guide

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...

7 months ago
Forum
Thermostats, Volumisers, Buffer Tanks, TRVs, Pumps, Piping, Valves, Radiators & Controls
Reply
RE: Just one room not reaching desired temperature

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...

7 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: How To Balance Radiators & the Role of the Lockshield Valve: A Homeowner's Guide

OK, the most interesting thing is the temperature drop across the buffer measured between flow from HP and flow to radiators. I dont think I can see ...

7 months ago
Forum
Thermostats, Volumisers, Buffer Tanks, TRVs, Pumps, Piping, Valves, Radiators & Controls
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