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Last seen: Mar 23, 2026
@ianmk13 Yes radiators will need replacing, most if not all. Many of them were installed 30 years ago and the plumber basically guessed the sizes when...
A Heat Geek installer came to assess my house today. What a difference from the other surveys, as in the professionalism displayed. He was here for 3 ...
Dropped into to a newly opened Energy Support Hub run by volunteers this morning to see what they had to offer. There was already someone in there bem...
@gunboatdiplomat A little more complicated. I have one small room that is entirely solid wall, one large room with one wall run that is about 15% soli...
@jamespa I agree it's sensible - now I know what their strategy is and it's not just a huge error. As I posted earlier they will be offering a much la...
A final ‘No’ from Octopus. Apparently they accept that I might have a heat loss of 10w but their software is not able to distinguish the subtleties be...
@gunboatdiplomat That’s good news and a good price as well - I’m only faintly jealous. My indicative quote came out at £6200 (including an unvented ho...
@ivanopinion Octopus have told me they will have a Cosy 16 next year capable of delivering 50c and will cover the alleged 14kw heat loss - if I’d like...
@jamespa I’ve challenged Octopus’s figures using the very helpful comments from this forum. They’ve come back and admitted that the heat loss might no...
@jamespa - great idea. I’ll download the data. @gunboatdiplomat - yes similar house. Mine is detached, 160sqmtr, 300mm plus insulation, double glaz...
@ivanopinion and @jamespa. I do have the half hour readings (but then so do Octopus). However I’m going to have one last go. Today I called a local fi...
@jamespa My actual gas usage is 16500kwh & electricity 3500kwh. My survey assumed a heat demand of 19200kwh. So a heat loss of 14300w? It can’t be...
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Degrees of Separation
Latest Posts
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RE: 7kW EV Charger Options Advice
Yes, that is the case, but as I understand it not as an...
By Rusty , 9 minutes ago
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RE: Problems with sizing a replacement for a Viessmann Vitocal 200-S
@jamespa — this chart is indeed suspect, it suggests th...
By cathodeRay , 1 hour ago
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RE: Next steps on my ASHP journey: Radiators and Pipework
Flow rate is set by pressure created by the circulator ...
By bobflux , 16 hours ago
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RE: Glass lined Cylinder for private water supply
I have one of those... a Thermal Store. In my case th...
By Transparent , 22 hours ago
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RE: Solar Power Output – Let’s Compare Generation Figures
@tim441 Here are those same three month periods for 202...
By Toodles , 24 hours ago
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RE: Adding additional Solar Panels to a DC coupled battery system
@transparent thank you for your reply above. As alway...
By Old_Scientist , 2 days ago
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RE: How Accurate Is My DIY Heat Loss Calculation?
@kilgorexv definitely a larger inverter will help and m...
By AndrewJ , 4 days ago
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RE: Adventures in heat loss calculations
@rob-of-york — thanks for posting this, all very useful...
By cathodeRay , 4 days ago
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RE: Surface mount or bury primaries for heat pump installation?
The installation is almost done! I've written up two ...
By tomasmcguinness , 4 days ago
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RE: Switch suitable to change between two inverter CT's
Last winter my battery ,32KWh, could run the house com...
By Jancold , 5 days ago
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RE: HeatGeek vs Octopus surveys: puzzling disparity - any ideas why?
Agree with Major. And even if I was very happy with ...
By Batpred , 5 days ago
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RE: Is the "divide by 2900" rule still valid?
There is another estimator that you could use, a formul...
By Rob of York , 5 days ago
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RE: To re-pipe or not to re-pipe? Moving from oil boiler to air source heat pump.
@penval, really useful update. After all the discussion...
By Mars , 7 days ago
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RE: Who's your electricity provider and what's your tariff?
@papahuhu I prefer to look at it simplistically. We d...
By Old_Scientist , 1 week ago
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