Joining the Renewable Heating Hub forums is completely free and only takes a minute. By registering youāll be able to ask questions, join discussions, follow topics youāre 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 10, 2026
@derek-m - yes, an adjusted curve makes sense, maybe something along the lines I suggested in my last post, 60@-2/40@15? By the bye, the rads seem to ...
@derek-m (and others) - readings with (at 1200 noon yesterday) weather comp turned off (Preset Temperature > Weather Set Temp > Zine 1 H-Mode Hi...
There are also small but cumulative losses eg cleaning a magnetic filter (though I suppose one could catch and recycle the water) and bleeding rads. I...
Ah, OK, thanks. So far, running at 55 degree LWT has the house feeling warmer, room temps up, but it's 'only' 8 degrees outside, so demand is not at i...
@batalto - point taken, it's also the linear/area thing, half the diameter = a quarter the area. You are also spot on with the primary circuit length,...
@batalto - you will have seen @derek-m's remarks about the PHE above, 3 degrees loss through the PHE from primary to secondary, which suggests that at...
Exactly, it is the unfortunate use of a unit of time in the name that makes it seem like a rate, when in fact it is a quantity (that can then be produ...
Interesting. I will see if anyone comments further on your 'ramblings' (which look very erudite to me), in the meantime, to clarify: ie kg/s = l/s...
One final very simple, I hope, example: two convector heaters, one 1.5kW and one 3kW. The 3kW one delivers heat energy at twice the rate of the 1.5kW ...
Indeed. I have read some accounts that do a sort of vanishing trick, where everything gets divided by itself, and all disappears into oblivion, though...
As @robl has pointed out, it is easy to get confused by the apparent similarity between mph (miles per hour) and kWh (kilowatt hours) but there is the...
@batalto (and others) - having cleaned the filter, and let the system run for a while, I am pleased to say the Midea controller is reporting a higher ...
- 27 Forums
- 2,762 Topics
- 65 K Posts
- 1,617 Online
- 7,168 Members
Join Us!
Installer Finder
Degrees of Separation
Latest Posts
-
RE: Vaillant Aurotherm - Heater Wire Position
Ah, good point. I need to check if this was installed i...
By Batpred , 1 hour ago
-
RE: Adventures in heat loss calculations
Posted by: @jamespa At this point its probably worth...
By Rob of York , 3 hours ago
-
@batpred thanks for getting a copy. Appreciate the supp...
By Mars , 13 hours ago
-
RE: Tell us about your Solar (PV) setup
We have a 6.56kW solar PV system (16x 410W panels) inst...
By Rob of York , 18 hours ago
-
RE: Where heat loss surveys seem to go against practical reality
@cathoderay @jamespa I've managed to get some nice re...
By Rob of York , 2 days ago
-
RE: 7kW EV Charger Options Advice
Doh, not sure that I was thinking straight there, less ...
By Rusty , 2 days ago
-
RE: Problems with sizing a replacement for a Viessmann Vitocal 200-S
Iām really liking reading through this thread and the r...
By Judith , 2 days ago
-
Thank you @trebor12345
By rgabor , 2 days ago
-
Panasonic Free Multi Z and Etherea Internal units.
My prospective installers have suggested the Panasonic ...
By Toodles , 3 days ago
-
RE: Next steps on my ASHP journey: Radiators and Pipework
Great. You just need to find a way of cranking up your...
By JamesPa , 3 days ago
-
RE: Heat Pumps Without Grants: Would You Have Installed One & Will You Now?
We had two heat pumps installed without Govt funding. H...
By Rob of York , 3 days ago
-
My Adapt is finally installed and running! Almost a yea...
By tomasmcguinness , 3 days ago
-
-
RE: Being screwed over by Volkswagen Audi Group
Thanks, @batpred. That integration is the one I have in...
By Majordennisbloodnok , 6 days ago


