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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: 3890
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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
Reply
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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RE: Radiator sizing sanity check

I find it impossible to believe that your house heats by 0.7C, or even 0.2C, in 2 minutes, unless you live in a tent. IMHO something else is causing ...

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

That really, really shouldn't happen and suggests that the heat pump may be well oversized or there is some other problem eg a badly set up buffer/LLH...

1 week ago
Forum
Thermostats, Volumisers, Buffer Tanks, TRVs, Pumps, Piping, Valves, Radiators & Controls
Reply
RE: Cascade 2x Grant Areona 10kw ASHP - Ongoing setup issues

Either complete Bow Locks or at best a marginal effect. The amount of energy it needs to produce is fixed by your house. If you force it to produce...

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

Are you saying that there is a loss of 8C from heat pump to rad. Thats a lot - why? If thats right then its not surprising rads are too small! &nb...

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

Air comes out of solution over time. I had to bleed one radiator every second day for a month after the installation was done and only the other day ...

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