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JamesPa
@jamespa
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Illustrious Member
Joined: Apr 3, 2023
Last seen: Jul 26, 2025
Profile Activity
Topics: 16 / Replies: 2638
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RE: (How) does your heat pump control its water pump?

@arundalep thanks, very interesting.

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Vaillant water pressure gauge vs Analogue gauge

Agree. It seems to me that if the external gauge is in the flow, ie immediately after the pump, then it would be expected that there is a pressure di...

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: towel radiator, which one?

In that case output at 40C will be 25% of quoted value, ie not a lot. Towel rails appear to be like this, options if not enough are add an elect...

4 months ago
Forum
Thermostats, Volumisers, Buffer Tanks, TRVs, Pumps, Piping, Valves, Radiators & Controls
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RE: Anyone able to provide some feedback before I make my finale decision? Samsung vs Baxi vs Vaillant

Further to the above here is the system pressure measured by my Vaillant. I know that this reacts to pump head, because (a) its about 0.6bar less tha...

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Vaillant water pressure gauge vs Analogue gauge

@jeegnesh My heating switched off altogether for three hours today, so the water pump stopped. Whilst it was off, the water pressure on the controlle...

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Anyone able to provide some feedback before I make my finale decision? Samsung vs Baxi vs Vaillant

The output is not, so far as I can tell, limited to 3.8kW when NR is active although I have only limited monitoring capability so could just be wrong....

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: towel radiator, which one?

Possibly 25mm Vs 22 mm pipes. Output depends on surface area principally, but also on form factor. A rad that is twice as tall as another will emit...

4 months ago
Forum
Thermostats, Volumisers, Buffer Tanks, TRVs, Pumps, Piping, Valves, Radiators & Controls
Reply
RE: Low Loss Headers and Buffer tanks - Your experiences wanted

@toodles Thanks, very helpful.

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Anyone able to provide some feedback before I make my finale decision? Samsung vs Baxi vs Vaillant

I have a 7kW Vaillant and it definitely has a PWM pump. The 12kW may differ of course. This water pump can, if you wish, be turned up or down manual...

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Are MCS are finally improving (some of) their guidelines?

I suppose it achieves what it is designed to achieve, namely to protect installers. Just like everything MCS so far as I can tell. He who pays the ...

4 months ago
Forum
Government Schemes, Regulations, Planning & Organisations
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RE: Low Loss Headers and Buffer tanks - Your experiences wanted

@toodles Thanks for this. I was working on a 'how to fix an LLH/buffer tank without removing it' script and more or less got, in my thought process...

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Anyone able to provide some feedback before I make my finale decision? Samsung vs Baxi vs Vaillant

@declan90 Be aware that this might impact COP negatively as you are aiming to increase the emitter DT. In principle higher emitter DT = lower av...

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
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