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JamesPa
@jamespa
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Illustrious Member
Joined: Apr 3, 2023
Last seen: Aug 26, 2025
Profile Activity
Topics: 17 / Replies: 2704
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Reply
RE: Heat pump's integral circulator pump

Why does it matter if the flow changes a bit, so long as its sufficient to carry the required energy? Mine certainly changes from time to time. No n...

6 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Share Your Experiences with Heat Pump Manufacturer Support

Not really, and thinking of them this way can mislead. Its also misleading to think of the heat pump sending a fixed amount of heat. It sends hot wa...

6 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Share Your Experiences with Heat Pump Manufacturer Support

That's actually two priorities, lwt and flow temperature are the same thing. If the radiators demand more heat, the only way it can maintain ft i...

6 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: What is this white plastic ring on my radbots?

Ebay? Or has the market been saturated as a result of ECO4?

6 months ago
Forum
Thermostats, Volumisers, Buffer Tanks, TRVs, Pumps, Piping, Valves, Radiators & Controls
Reply
RE: Fujitsu Waterstage WOYG160LJL Air Source Heat Pump

@barrovian1963 yes. Not ideal but not disastrous either. There are tricks to increase the period/reduce the frequency eg increase flow temp hysteris...

6 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Fujitsu Waterstage WOYG160LJL Air Source Heat Pump

A period of on followed by a period of off is one cycle, but only if followed (or preceded) by more on-off periods. One on/off transition on its own ...

6 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: buffer/volumizer cupboard space eater, do i need one?

Absolutely could be a volumiser and thats what I would recommend if the extra system volume is needed to meet the minimum requirement.

6 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Share Your Experiences with Heat Pump Manufacturer Support

I will answer in a different order in the hope of shedding some light. Before I do though I would make the general remark that, in order to analyse t...

6 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Fujitsu Waterstage WOYG160LJL Air Source Heat Pump

Nothing wrong with a remote on/off switch. I used to use my 40 year old hall thermostat that way when I had a boiler (as a thermostat it was essentia...

6 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: buffer/volumizer cupboard space eater, do i need one?

You are right, the very low flow temp is the major contributor to good COP. Also, at low flow temperatures, the potential penalty of a buffer is less...

6 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Say hello and introduce yourself

The installers who insist you need a buffer are ones to be avoided. You may need a volumiser which has only 2 ports. These dont suffer the problems ...

6 months ago
Forum
Introductions, Forum Rules & Updates
Reply
RE: What is this white plastic ring on my radbots?

OK, let me refine my simplified initial statement. Generally I would recommend that any TRVs except (a) for aesthetic reasons as described above ...

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