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JamesPa
@jamespa
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Illustrious Member
Joined: Apr 3, 2023
Last seen: Sep 10, 2025
Profile Activity
Topics: 17 / Replies: 2822
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RE: How much radiator capacity do I need for an air source heat pump?

Not a real problem. If the rad output is correct at the design FT and design OAT, then it will also be (almost) correct at the lower FT determined...

8 months ago
Forum
Thermostats, Volumisers, Buffer Tanks, TRVs, Pumps, Piping, Valves, Radiators & Controls
Reply
RE: How much radiator capacity do I need for an air source heat pump?

Ah, that makes sense and the 7kW Vaillant plus backup is a strategy a neighbour of mine has, so far successfully, adopted. Note that at -2 the 7kW Va...

8 months ago
Forum
Thermostats, Volumisers, Buffer Tanks, TRVs, Pumps, Piping, Valves, Radiators & Controls
Reply
RE: How much radiator capacity do I need for an air source heat pump?

It wasn't supposed to be a criticism, just additional info. If you are building a spreadsheet, which many do, a formula is more useful than a table! ...

8 months ago
Forum
Thermostats, Volumisers, Buffer Tanks, TRVs, Pumps, Piping, Valves, Radiators & Controls
Reply
RE: How much radiator capacity do I need for an air source heat pump?

Many manufacturers give an equation in the following form: output is proportional to (deltaT)^n where deltaT is the mean difference between the ...

8 months ago
Forum
Thermostats, Volumisers, Buffer Tanks, TRVs, Pumps, Piping, Valves, Radiators & Controls
Reply
RE: How much radiator capacity do I need for an air source heat pump?

First question, what's the heat loss of your house? If by any chance you have a smart meter and can get half hourly or daily gas consumption you can...

8 months ago
Forum
Thermostats, Volumisers, Buffer Tanks, TRVs, Pumps, Piping, Valves, Radiators & Controls
Reply
RE: Thinking of ripping our my IVT Greenline HT Plus C model and replacing with a gas boiler.

Further to the above I found the manual here Page 37 describes the alarm and possible reasons, of which a blocked filter is one. Page 2...

8 months ago
Forum
Grounds Source Heat Pump (GSHPs)
Reply
RE: Thinking of ripping our my IVT Greenline HT Plus C model and replacing with a gas boiler.

Do you know what the alarm means. From what you 'have been told' it sounds like a 'low flow' alarm. If it wasnt there initially then something ...

8 months ago
Forum
Grounds Source Heat Pump (GSHPs)
Reply
RE: Is My Midea Heat Pump Inherently Defective?

As a former local government employee (following a career in engineering) I realised that explaining the consequences to politicians simply and in ter...

8 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: ASHP and how it should run and potential kw consumption?

I am planning on trialling night time 'set forward' to take advantage of cheap rate tarrif. I have no idea if it will work in practice. The challeng...

8 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Is My Midea Heat Pump Inherently Defective?

Thanks for that, I think there is much comfort to be drawn because of: ... with which, based on everything you have told me, I agree. My heat ...

8 months ago
Forum
Air Source Heat Pumps (ASHPs)
Topic
Defrost behaviours
8 months ago
Forum
Air Source Heat Pumps (ASHPs)
Replies: 6
Views: 761
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RE: ASHP and how it should run and potential kw consumption?

I think that conditions over the last couple of days are about the worst possible - cold but very wet = lots of defrost. I too am interested in what ...

8 months ago
Forum
Air Source Heat Pumps (ASHPs)
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