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JamesPa
@jamespa
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Illustrious Member
Joined: Apr 3, 2023
Last seen: Jan 11, 2026
Profile Activity
Topics: 20 / Replies: 3883
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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)
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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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RE: Cascade 2x Grant Areona 10kw ASHP - Ongoing setup issues

@adam That all sounds very sensible and I agree with your analysis. Like you I turn on the immersion on the very coldest days, because I run low n...

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

No chance! Largely, hence my suggestion to do some experimenting with the Homely set temp set to 30C, thus taking that element of control out of ...

1 week ago
Forum
Thermostats, Volumisers, Buffer Tanks, TRVs, Pumps, Piping, Valves, Radiators & Controls
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RE: Grant ASHP 17.5 kw. weather curve

@chinkoa   Sorry there are two separate thoughts going on which I didn't make clear:   "What's the capacity of the heat pump. Flow...

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

Agree. I think I have given you several pointers to help track it down, its now up to you whether to pursue any or hope your installer will diagnose,...

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

@papahuhu sorry - confusing info in previous posts Anyway upstairs rads aren't getting to anything like the flow temp it seems so that needs to be f...

1 week ago
Forum
Thermostats, Volumisers, Buffer Tanks, TRVs, Pumps, Piping, Valves, Radiators & Controls
Reply
RE: Grant ASHP 17.5 kw. weather curve

What's the capacity of the heat pump. Flow rate (l/s) x DT (say 5) x 4.2 = heat transferred in kW which needs to be greater than or equal to capacity...

1 week ago
Forum
Air Source Heat Pumps (ASHPs)
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