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Last seen: Sep 13, 2026
@judith Thanks very much for this! My room by room calculation, done on my own spreadsheet, comes out at about 18 kW. I've also found the original Nu-...
@cathoderay Yes, it does look much better, thanks for suggesting it. I do now log gas consumption for DHW additionally to the total consumption, so it...
@cathoderay I've deblobbed the chart and extrapolated. Also gas usage for DHW was a crazily high 39 kWh per day mainly because the circulating pump ...
The Vitotronic 200 WO1C control unit manual can be downloaded here (link will download the PDF manual): Viessmann Manual The relevant descriptions a...
@cathoderay @transparent @jamespa I've got data from my outside temperature sensors (mounted on a shaded, north facing wall) so I might try again usin...
@jamespa Thanks for this. Let me address the hot water point first. The basement plant room has two Viesmann Vitocell 300 hot water cylinders, each wi...
@transparent Sorry for the silence, I'm working today but will reply properly this evening (yes, ERA5 was Claude's choice, but I can go back to degree...
@jamespa @transparent Sorry about that. Here are the charts, hopefully these are a bit easier to follow than the text:
@bobflux It was originally, but now both are using the same heating curve, with the TRVs fully open.
@jamespa I have revised my figure downwards as a result of your scrutiny, so thank you! The challenge about wanting to see the raw plots, and the ques...
Hello everyone. I've recently found this forum and thought I would detail my setup as I've spent a lot of time on it over the years. My house was ne...
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Degrees of Separation
Latest Posts
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RE: How quickly would you want/expect heat recovery to take from setback?
I have no idea how the control loop works with the Cosy...
By AndrewJ , 3 hours ago
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RE: How should the Boiler Upgrade Scheme be reformed?
Not quite, regular A2W heat-pumps need a load of extra ...
By Temperature_Gradient , 18 hours ago
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RE: Heat Geek installations: share your experiences
one thing i learnt from reading people’s comments and e...
By Batpred , 20 hours ago
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RE: Cooling/heating with one unit
"The way we use A2A on a cheap overnight EV tariff is t...
By mrkfm , 22 hours ago
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RE: Do I add Air Con or MVHR to existing A2W ASHP?
We have ‘signed on the dotted line’ today for a Panason...
By Toodles , 23 hours ago
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RE: Heat pump branding. Clever, contemporary… or a bit too much?
...or it was there and was lost thanks to laziness and ...
By Majordennisbloodnok , 23 hours ago
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@bobflux Thank you for your response. I am trying to ...
By RonV. , 23 hours ago
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This post is about how I successfully configured a buff...
By Tony.Stolz , 1 day ago
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The installer visited yesterday and suggested the noise...
By JamesChatz , 1 day ago
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RE: HeatGeek vs Octopus surveys: puzzling disparity - any ideas why?
Your house sounds a lot like mine. 2 surveyors each sp...
By JamesPa , 1 day ago
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RE: Heat Geek Zero Disrupt: Are We Sleepwalking Into Another Race to the Bottom?
Thats true only if you do the wrong experiment. Done c...
By JamesPa , 1 day ago
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RE: battery storage without solar
As of October 1st they need specific qualifications to ...
By EtchedPixels , 2 days ago
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RE: Renewables & Heat Pumps in the News
With regards to the BUS grant raid, I gave it more thou...
By ASHP-BOBBA , 2 days ago
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RE: Why are ASHP installs so expensive?
The whole system seems to work on the basis of...
By ian33a , 2 days ago
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