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Last seen: Nov 10, 2026
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...
@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...
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....
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...
@toodles Thanks, very helpful.
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...
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 ...
@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...
@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...
I note 21 degrees specifies a 25l buffer tank. I would check, if you haven't already, that this is 2 port not 4 port. I would not accept the proposa...
Radiator manufacturers publish the volume of water in their radiators. For any given height and type its proportional to length so they often just gi...
Re the Ebac heat pumps The heading on the table is presumably meant to be kW not kWh! - the 9kW one will be cycling almost continuously with a min...
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