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JamesPa
@jamespa
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Illustrious Member
Joined: Apr 3, 2023
Last seen: Sep 11, 2025
Profile Activity
Topics: 17 / Replies: 2824
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RE: How much radiator capacity do I need for an air source heat pump?

All noted, I hadn't encountered HTC before, but now you have explained it it makes perfect sense. Your concerns about consumption based estimates a...

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

Each Jaga rad has its own temp sensor and fan controller. There is no central connection to the heat pump. Same with Mitsi and just about every othe...

8 months ago
Forum
Thermostats, Volumisers, Buffer Tanks, TRVs, Pumps, Piping, Valves, Radiators & Controls
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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)
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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)
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