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Last seen: May 18, 2026
@rhiannon Welcome to the forums and feel free to ask any questions. The best way to run almost any heat pump is 24x7 with any thermostat set to say ...
Er dont you expect the mean 24hr temp to be lower on setback days. Thats sort of the point. The mean of interest is surely the mean IAT during the h...
Too expensive IMHO for a whole house, at this point do the job properly and fit fancoils (also expensive!) or larger radiators. Best IMHO used in 'ma...
@mars I think you say somewhere in the video that fans dont increase rad output. I think they do. By blowing more air over the fins/panels the heat ...
Sorry I dont know the answer to that as I dont have a Mitsubishi myself. Perhaps @sheriff-fatman knows. I imagine somewhere in the installer section...
What I have definitely noticed since getting the heat pump is that I have almost no sense of what the outside temperature is; I have to look at the he...
'setback running shoots itself in the foot by somehow compromising COPs at higher OATs?' is very plausible. At higher OATs the heat pump is going t...
All noted, Im not doubting you, just trying to be certain (and hopefully help you be certain) that what you are measuring is real and representative o...
So you can get totally analogue sensors that are held on the side of the flue by a magnet. Hook up a cheap camera pointed at the sensor and feed the ...
Thanks for the further info. Are the two pumps just because one wasnt sufficient, or is there anything between them. Have you got the Mitsubishi pr...
Have you got an LLH or buffer? If so which pump speed did you reduce and which flow rate are you measuring? At moderate OAT expect deltaT to fall u...
OK 12 hours stable running should be enough to get a good reading. Can you be more precise about where the flow and return temperature sensors which...
Latest Posts
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RE: ASHP Capacity loss with aging
This is a good question. The short answer IMO is yes, c...
By Mars , 7 hours ago
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RE: Daikin Altherma 3 with Fan Coils in Puglia (Italy)… Sanity Check on System Operation
Welcome @simon_jm, and this is not a dumb question at a...
By Mars , 7 hours ago
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RE: Loud noises in the night - and one for the toolbox?
Brilliant bit of lateral thinking, and a useful one to ...
By Mars , 9 hours ago
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RE: Setback savings - fact or fiction?
Yes, also the higher OAT end is possibly a smidge high ...
By RobS , 9 hours ago
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RE: UK warm homes plan - how can it be delivered?
@bobflux My view is that regulation for consumer pro...
By Batpred , 11 hours ago
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Hi Mars, I've sent you a request to connect me with a...
By sttpd1917 , 12 hours ago
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RE: Sizing an ASHP; Heat loss and kW
Annual consumption is almost certainly better than an E...
By JamesPa , 16 hours ago
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Grant Aerona R290 (15.5kW) - How is DHW Target Temp calculated?
Hello all, We have just had a Grant Aerona R290 insta...
By TaffontheTaff , 18 hours ago
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RE: Advice on Vaillant Sensocomfort
The latest Vaillant announcement I saw said that they w...
By JamesPa , 22 hours ago
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RE: Debugging my legionella immersion heater
I notice this (66 is rather hot) with my legionella cyc...
By JamesPa , 1 day ago
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RE: DIY Heat Pump Installations: Navigating Legal and Regulatory Hurdles
@transparent I thought you would spot that wind turbine...
By Batpred , 1 day ago
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RE: Octopus Cosy Heat Pump Owners & Discussion Thread
@swwils there is no logic to oversizing a heat pump. It...
By AgentGeorge , 2 days ago
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RE: Vaillant Sensocomfort Time
Thank youy for the pointer. I think I have managed to ...
By ispookie666 , 2 days ago
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RE: Forum updates, announcements & issues
I have been doing a lot of work on the site lately and ...
By Mars , 2 days ago
