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JamesPa
@jamespa
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Illustrious Member
Joined: Apr 3, 2023
Last seen: Aug 25, 2025
Profile Activity
Topics: 17 / Replies: 2699
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Reply
RE: How much radiator capacity do I need for an air source heat pump?

I will concede that the first sentence was blunt and for that I apologise if offence was caused. It was intended to be succinct (surely a good thing)...

8 months ago
Forum
Thermostats, Volumisers, Buffer Tanks, TRVs, Pumps, Piping, Valves, Radiators & Controls
Reply
RE: Defrost behaviours

Thats a brilliant plot with a full range of temperatures. Your 'no cycle' window is clearly shown as about 8C-5C. The cycles even only just above 8C...

8 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: ASHP on a low income: a cautionary tale

I 100% agree that this needs tackling and understanding. I have seen very little analysis of the economics of part time heating with either fossil f...

8 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: New 5kW Samsung Gen6 heat pump owner with loads of questions

In fairness that is well understood and why its costs over a season/SCOP that commonly get quoted and compared not costs at any particular temperature...

8 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Yet another government reverse ferret - flakey grids and property lobbies

⁶ The article goes on to say this "However, minimum standards for energy efficiency in newly built properties under the rules will preclude th...

8 months ago
Forum
Government Schemes, Regulations, Planning & Organisations
Reply
RE: Thinking of ripping our my IVT Greenline HT Plus C model and replacing with a gas boiler.

I can see the magnaclean. I cant remember whats inside TBH but that sounds about right. Oh dear - its just possible that the heat exchanger coul...

8 months ago
Forum
Grounds Source Heat Pump (GSHPs)
Reply
RE: How much radiator capacity do I need for an air source heat pump?

as @downfield says fan radiators (with the exception, I think, of the Myson Ulow-2 which is literally a more or less standard radiator plus fans) have...

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?

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
Reply
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
Reply
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
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