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JamesPa
@jamespa
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Joined: Apr 3, 2023
Last seen: Jan 10, 2026
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Topics: 20 / Replies: 3877
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RE: Radiator sizing sanity check

Frankly Im not surprised. Please do read my previous post which, following 3 years on this forum and a very successful personal heat pump install, is...

1 week ago
Forum
Thermostats, Volumisers, Buffer Tanks, TRVs, Pumps, Piping, Valves, Radiators & Controls
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RE: Radiator sizing sanity check

Decades of dirt cheap North sea gas killed the competence of the heating industry in the UK. Just shove in a grossly oversized 30kW condensing boiler...

1 week ago
Forum
Thermostats, Volumisers, Buffer Tanks, TRVs, Pumps, Piping, Valves, Radiators & Controls
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RE: Radiator sizing sanity check

Ah, now it makes more sense. If it's sitting on the grille it's measuring air temp not rad temp. They need to be properly strapped to the radiator i...

1 week ago
Forum
Thermostats, Volumisers, Buffer Tanks, TRVs, Pumps, Piping, Valves, Radiators & Controls
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RE: Optimum new build house design for Heat Pump

That's a great one for the Uxbridge English dictionary (I'm Sorry I Haven't a Clue - Radio 4)  

1 week ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Radiator sizing sanity check

Are they properly in contact with the metal? You could check them with iced water and boiling water or tuck them under the insulation of the flow fr...

1 week ago
Forum
Thermostats, Volumisers, Buffer Tanks, TRVs, Pumps, Piping, Valves, Radiators & Controls
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RE: Radiator sizing sanity check

At 27 (DT of 10 relative to room) your rad output is roughly 20% of the output at 50 (dt 30 relative to room), say 600W. The rads most of the time ar...

1 week ago
Forum
Thermostats, Volumisers, Buffer Tanks, TRVs, Pumps, Piping, Valves, Radiators & Controls
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RE: Radiator sizing sanity check

OK Ive read this again and it just isnt making sense     If I read this correctly you are apparently saying that that the house tem...

1 week ago
Forum
Thermostats, Volumisers, Buffer Tanks, TRVs, Pumps, Piping, Valves, Radiators & Controls
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RE: Radiator sizing sanity check

OK @papahuhu that makes things clearer. I dont know what algorithm Homely uses (@toodles may be able to help here - if @toodles you do look at this p...

1 week ago
Forum
Thermostats, Volumisers, Buffer Tanks, TRVs, Pumps, Piping, Valves, Radiators & Controls
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RE: Optimum new build house design for Heat Pump

A single design temp of 35 or less really would be the way to go. If it were my newbuild I would be insisting on it unless I had concrete proof (not ...

1 week ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Biocide and Inhibitor

One school of thought says put almost nothing in and instead treat only to VDI2035 which is a German standard. So far as I can see there is a lot to ...

1 week ago
Forum
Thermostats, Volumisers, Buffer Tanks, TRVs, Pumps, Piping, Valves, Radiators & Controls
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RE: Optimum new build house design for Heat Pump

Im not sure what your thought process is here. Are you suggesting running with a max FT of 40 rather than the max of (say) 35 that the UFH is likely ...

1 week ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Radiator sizing sanity check

The nominal will be the flow rate for rad dt5 at full output. Ideally you should be looking to achieve this but.. your 16kW heat pump is likely well ...

1 week ago
Forum
Thermostats, Volumisers, Buffer Tanks, TRVs, Pumps, Piping, Valves, Radiators & Controls
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