Last seen: Feb 6, 2026
@swwils good results supporting running heat pumps at lowest FT that will keep the home warm and not overheat it @andrewj are you able to adjust you...
Has anyone seen a graph of efficiency vs Flow Temp. Trying to achieve FT of 45C when it’s-12C outside sounds like a step to far. with my setup, ive no...
@kevh they certainly have updated the App to allow 45C, you can see the screen grab I di a few days ago shows 50C as the lowest. I’ve changed mine t...
This has been on the App front screen for a few weeks, so being bored 🙂 decided to click the link and read all about how your Cosy should've been se...
@kevh you cant change the 50C on a Cosy install, if you try, it will let you type 45, then you get a red warning that 50 is minimum. i wonder if you...
@swwils What i deduce from all the comments in this forum is that hardly any installation has been setup. Mine by Octopus was just a simple spec, fit ...
@editor I can detail the concise version of events, if anything strikes a chord I can elaborate initially declined to quote, which I deduced by chan...
@andrewj found this article by heart geeks it touches a lot of topics, WC is as you described, a line or curve between 2 OATs where flow temperat...
@kevh todays COP is 4.02 (0.5-6.8C), 2 days ago was 4.50 (5.5-8C) The lower overnight temperature has affected the performance, likely more defrost ...
The App says it choses the top temperature when OAT is above 12C, my system is running at 36C today and its 6.8C according to Cosy HP. Logic would sug...
@editor i have detailed my experience with Octopus on your forum, if you need further discussion on them id be happy to spend a few hours detailing ho...
Latest Posts
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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
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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 , 6 hours ago
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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
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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
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RE: Daikin 6kw setup with Dixell controller
@jamespa Many thanks for your reply, a very detailed an...
By CraigH , 9 hours ago
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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
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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
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RE: Octopus Cosy Heat Pump Owners & Discussion Thread
@agentgeorge Probably, but temperature change at -10 ha...
By AndrewJ , 10 hours ago
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RE: External wall insulation - your experience
To be clear, my experience was very positive. The journ...
By Batpred , 12 hours ago
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@foxesfan Re: ‘Servicing’ as @editor has covered in his...
By Toodles , 12 hours ago
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RE: A Smarter Smart Controller from Homely?
@benson No idea why mine doesn’t work, all I see on ...
By Papahuhu , 13 hours ago
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RE: Battery sizing - How low can you go!
It seems I am seeing something similar to what you do, ...
By Batpred , 14 hours ago
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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
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RE: Bosch CS5800i 5kW - Experience So Far
@majordennisbloodnok While getting Home Assistant runni...
By Steelbadger , 1 day ago
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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
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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
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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
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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
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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
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RE: Setback savings - fact or fiction?
But if it is recorded an an integer, which it seems it ...
By cathodeRay , 2 days ago
