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 5, 2026
@agentgeorge I’m aware of the process - in fact, it’s been mentioned by @jamespa and @toodles in this thread a few times. The approach requires reduc...
I don’t know how it is implemented but the two temps you select are the end points at -10c and +12c. The WC curve is, as far as people can tell, line...
@agentgeorge They redid the survey and determined the heat loss was 1kW less than original. This also then identified that most of the radiators were...
@swwils I tried that, but couldn’t get the flow temp down low enough to stop overheating.
If the hardware limits what can be done then I don't see what an advanced controls mode could actually do. Currently, it is possible to run as "alway...
Mostly my thoughts although I'm on the fence whether I regret it or not. My other quote was £12k more from Heat Geek so in some respects it's a no-br...
I wonder if there’s been a firmware update recently. It’s 3c outside and the Cosy is quiet which is unusual. It would have been noticeable at this ...
I haven’t tried that but may do so. I (my wife) wouldn’t want it below 21c when we go to bed so that’s my target. Last night, I managed 21.8c so I s...
No idea, the valve is fine, I had it set at 3 and the room is 22.8c typically. 3 should be 20c but….what can I say?? @swwils I guess I don’t care a...
@kevh yes, both ends actually. They have been pretty emphatic about not dropping the Cosy 9 below 36c and I’ve been told by one techie that it can’t ...
No it doesn't: as I commented on the Cosy 9 thread, the flow temps on the Cosy systems can't be lowered enough to deal with oversized radiators and "a...
I haven't and it is definitely not as loud as being reported here. The Cosy 12 is not starting from a whisper baseline though. I haven't reported an...
SPONSORS
Degrees of Separation
Latest Posts
-
RE: Where heat loss surveys seem to go against practical reality
I am amazed that there is not something out there to me...
By JamesPa , 2 hours ago
-
RE: Next steps on my ASHP journey: Radiators and Pipework
@bobflux The hydraulic simulator is very interesting...
By Rob of York , 7 hours ago
-
RE: 7kW EV Charger Options Advice
Thanks. Yes, we have patchy 4G. The only option we had ...
By Rusty , 13 hours ago
-
-
RE: Being screwed over by Volkswagen Audi Group
Thanks, @batpred. That integration is the one I have in...
By Majordennisbloodnok , 1 day ago
-
RE: How Accurate Is My DIY Heat Loss Calculation?
@batpred I suspect it will be more this year. I had 9 ...
By AndrewJ , 1 day ago
-
RE: Surface mount or bury primaries for heat pump installation?
@jamespa It's rusting 🙂
By tomasmcguinness , 1 day ago
-
RE: Glass lined Cylinder for private water supply
Thank you, once again, for your replies. Yes...
By ian33a , 1 day ago
-
It’s been out a few days and Amazon has already attache...
By Mars , 1 day ago
-
RE: Missing flow temperature in Heat Geek proposal
Yes, and this is another point I agree. We did find a f...
By Batpred , 2 days ago
-
RE: Problems with sizing a replacement for a Viessmann Vitocal 200-S
A very good point. In effect, the DHW pipework is an em...
By cathodeRay , 2 days ago
-
RE: Solar Power Output – Let’s Compare Generation Figures
@tim441 Here are those same three month periods for 202...
By Toodles , 4 days ago
-
RE: Adding additional Solar Panels to a DC coupled battery system
@transparent thank you for your reply above. As alway...
By Old_Scientist , 5 days ago
-
RE: Adventures in heat loss calculations
@rob-of-york — thanks for posting this, all very useful...
By cathodeRay , 6 days ago
SPONSORS
