Last seen: Feb 6, 2026
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...
@toodles I believe that is the case. At warmer temps, say >4c, it's quiet, and it's definitely not as noisy as reported here for the Cosy 12. I d...
The Cosy 9 isn't exactly the strong silent type and I also dismissed most noise complaints as just people being picky. When it is cold and it's worki...
@swwils I’m not too worried about things like solar gain as it’s a bit out of anyone’s control. In fact the porch now gets over 21c on sunny days bec...
@agentgeorge they are oversized, except now the porch and downstairs wc which are now about right. According to the radiator schedule the kitchen is ...
@toodles the LSV in the bedroom is only just cracked open and I will see how it goes. For most of the day, the room has been sat at 23.2c, up from 22...
Latest Posts
-
RE: If a heat pump can only heat DHW to 50C then what? Issue with 18KW Heliotherm heat pump
Hi, Nothing yet. I've asked customer to measure flow...
By errmm , 5 hours ago
-
RE: High Temp Heat Pumps for fast warm-up of house
I don't know exactly how long it takes to heat up (and ...
By JamesPa , 7 hours ago
-
RE: Need help maximising COP of 3.5kW Valiant Aerotherm heat pump
OK. What Im seeing looks fairly normal TBH: 1 start ...
By JamesPa , 7 hours ago
-
RE: Vaillant Tech Support Flagged Low DT: UFH Return Cold, Suspected Zero Flow
@editor thanks for the tips which I will try before cal...
By DavidB , 9 hours ago
-
RE: Daikin 6kw setup with Dixell controller
@jamespa Many thanks for your reply, a very detailed an...
By CraigH , 9 hours ago
-
RE: Exploring the role of alternative clean heating solutions - Government Consultation
Despite reservations, I found some time to respond to t...
By Rusty , 9 hours ago
-
RE: New Vaillant aroTherm Plus in black - When will it come to the UK?
@crankplus, nope, still not, and I've followed up with ...
By Mars , 9 hours ago
-
RE: Octopus Cosy Heat Pump Owners & Discussion Thread
@agentgeorge Probably, but temperature change at -10 ha...
By AndrewJ , 10 hours ago
-
RE: External wall insulation - your experience
To be clear, my experience was very positive. The journ...
By Batpred , 12 hours ago
-
@foxesfan Re: ‘Servicing’ as @editor has covered in his...
By Toodles , 12 hours ago
-
RE: A Smarter Smart Controller from Homely?
@benson No idea why mine doesn’t work, all I see on ...
By Papahuhu , 13 hours ago
-
RE: Battery sizing - How low can you go!
It seems I am seeing something similar to what you do, ...
By Batpred , 14 hours ago
-
RE: Gaslighting in the heat pump industry – has anyone else experienced this?
Don’t know if this is relevant to this thread, but my A...
By Gruff2001 , 14 hours ago
-
RE: Bosch CS5800i 5kW - Experience So Far
@majordennisbloodnok While getting Home Assistant runni...
By Steelbadger , 1 day ago
-
RE: MCS - BS EN 12831-1:2017 – Heat Loss Survey
Since May 2025 it no longer a requirement in England to...
By JamesPa , 1 day ago
-
RE: Air source heat pump roll call – what heat pump brand and model do you have?
Forum Handel @jancold Manufacturer: Daikin Model: E...
By Jancold , 1 day ago
-
RE: Octopus Cosy 12 Heat Pump Regret: Incredibly Loud, Poor Heating & Constant Hum - Help!
@harriworld it was roughly 3am for an hour as that’s ...
By L2jad , 1 day ago
-
RE: Hoped for improvements not being realised on my Mitsubishi heat pump
I have been wondering that myself. The fact is that, ...
By JamesPa , 1 day ago
-
RE: Filtering Tap Water – Share Your Setup for Cleaner, Better-Tasting Water
I remember when I was in my early 20s I was introduced ...
By Majordennisbloodnok , 2 days ago
-
RE: Setback savings - fact or fiction?
But if it is recorded an an integer, which it seems it ...
By cathodeRay , 2 days ago
