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JamesPa
@jamespa
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Illustrious Member
Joined: Apr 3, 2023
Last seen: Jan 3, 2026
Profile Activity
Topics: 19 / Replies: 3776
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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 day 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 day 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

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 day ago
Forum
Air Source Heat Pumps (ASHPs)
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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 day ago
Forum
Thermostats, Volumisers, Buffer Tanks, TRVs, Pumps, Piping, Valves, Radiators & Controls
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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 day ago
Forum
Thermostats, Volumisers, Buffer Tanks, TRVs, Pumps, Piping, Valves, Radiators & Controls
Reply
RE: Cascade 2x Grant Areona 10kw ASHP - Ongoing setup issues

I presume he didnt say why? I dont personally understand how this can be the case (so suspect BS) but of course willing to listen to arguments. &nb...

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

Well that puts a different light on it altogether! Radiators not getting warm would be due to one or more of (a) valve blocked - note that TRV pins...

1 day ago
Forum
Thermostats, Volumisers, Buffer Tanks, TRVs, Pumps, Piping, Valves, Radiators & Controls
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RE: Water Hammer After Heat Pump Install

@jaynieq I wish you luck with this one. I think the main thing I am telling you is to focus (when discussing with any plumber) on the water hammer an...

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

Thats good. Keep the faith, rad swaps are easy and rads are dirt cheap. Even I can do 2.5 a day, I am not a plumber and absolutely detest plumbing!

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

Total and complete madness! Better would have been to leave the upstairs rads, make the downstairs ones bigger if there is room, and drop FT, or just...

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

All sounds good and like you know what you are doing. Radiator balancing can be tedious and the poor control that LSVs give really doesn't help. I ha...

1 day ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Grant ASHP 17.5 kw. weather curve

Firstly welcome to the forums.   I hope you are running your heat pump 24*7 with any TRVs and thermostats set well above the desired temperat...

2 days ago
Forum
Air Source Heat Pumps (ASHPs)
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