Joining the Renewable Heating Hub forums is completely free and only takes a minute. By registering you’ll be able to ask questions, join discussions, follow topics you’re interested in, bookmark useful threads and receive notifications when someone replies. Non-registered members also do not have access to our AI features. When choosing your username, please note that it cannot be changed later, so we recommend avoiding brand or product names. Before registering, please take a moment to read the Forum Rules & Terms of Use so we can keep the community helpful, respectful and informative for everyone. Thanks for joining!
Last seen: Sep 20, 2026
At this point I would like to observe that the flue fan from my gas boiler was very distinctly audible in parts of the house, as at times were some of...
@sandman1600 Im glad the analysis helps with understanding at least, that particular plot was a real goldmine. 3sq m surface area for the DHW coil i...
@arundalep thanks, very interesting.
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...
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...
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 ...
SPONSORS
Degrees of Separation
Latest Posts
-
RE: Next steps on my ASHP journey: Radiators and Pipework
@jamespa since going back to bed and reading again this...
By Singlespeed , 3 hours ago
-
RE: Recommendations in Ely (Cambs) area for Full setup checks on Nibe HP setup for House.
If they can't don't give up. Heat pumps are, in reali...
By JamesPa , 19 hours ago
-
RE: Starting Our Heat Pump Journey: 1962 build 3 bed detached house
@ian-s I wouldn't be too concerned about the design ...
By Rob of York , 19 hours ago
-
RE: Missing flow temperature in Heat Geek proposal
Yes that's what would happen by turning down the lsv to...
By JamesPa , 20 hours ago
-
RE: Grant R290 DHW Cycle Interuption
It looks like some sort of short pre-run. The question...
By JamesPa , 21 hours ago
-
RE: Cascade System or larger single unit
@renewables345 I would say if it a new build it’s no mo...
By Aventus Eco , 22 hours ago
-
RE: Why are ASHP installs so expensive?
Posted by: @batpred There´s another aspect that coul...
By Rob of York , 1 day ago
-
RE: Say hello and introduce yourself
@gz00, welcome to the forums. There’s a huge amount of ...
By Mars , 2 days ago
-
RE: Home energy storage & battery register
1 fox ess lv5200 batteries, plus 2 more waiting to be i...
By Jimcub , 2 days ago
-
RE: Heat Pump deployment statistics: June 2026
@l8again Unfortunately the government is, I suspect,...
By JamesPa , 2 days ago
-
My feed of random industrial auctions turned up this au...
By Prunus , 2 days ago
-
Thank you @majordennisbloodnok – that means a lot, part...
By Mars , 3 days ago
-
We’ve just passed 20 million forum views! 🎉
It's official. The Renewable Heating Hub forums have of...
By Mars , 3 days ago
-
RE: Who's your electricity provider and what's your tariff?
@batpred When the raw material input has increased in c...
By Papahuhu , 4 days ago
SPONSORS
