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Last seen: Sep 5, 2026
@batpred I suspect it will be more this year. I had 9 months at 15p export and just 3 months at 12p. This year it’s likely to be 12p all the way, al...
@kilgorexv definitely a larger inverter will help and more PV will help support your usage in winter - we have 10kW of PV split across east and west a...
From experience, I think an 8kW inverter is the smallest worth having depending on household. In winter, the ASHP might pull 3kW or so, an oven heati...
@toodles possibly. The £9k labour charge for 4-5 days work certainly didn’t help.
Just be aware that Octopus are likely to over estimate the heat loss, as could any other installer. You should have a plan for discussing their calcu...
@jamespa Thanks James, very helpful. From the proposal and some email threads I've seen, the installer comes over as pretty competent. Obviously the...
@watcher actually, a picture from inside the living room on a sunny day and cloudy day, at midday, with the shutters open would be very useful. What ...
@lizzie that is useful info, thanks. I’m currently considering external shutters to try and reduce solar gain as our house typically heats up to over...
@ian-s I too can provide some insight. We have a Cosy 9 along with 10kW PV and 16kW of battery, 8kW inverter plus an EV. The batteries are charged u...
@ian-s that would point to a 5kW heat pump being sufficient assuming you want the same temperatures across the house. These ought to be considered 15...
@jamespa I used 9MWh of gas but the heat loss was originally calculated at around 8.5kWh and a 9kW heat pump installed. It was subsequently recalcula...
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Degrees of Separation
Latest Posts
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RE: Where heat loss surveys seem to go against practical reality
@rob-of-york Interesting that you mentioned this as an ...
By ian33a , 1 hour ago
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RE: Next steps on my ASHP journey: Radiators and Pipework
@bobflux The hydraulic simulator is very interesting...
By Rob of York , 2 hours ago
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RE: 7kW EV Charger Options Advice
Thanks. Yes, we have patchy 4G. The only option we had ...
By Rusty , 8 hours ago
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RE: Being screwed over by Volkswagen Audi Group
Thanks, @batpred. That integration is the one I have in...
By Majordennisbloodnok , 23 hours ago
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RE: How Accurate Is My DIY Heat Loss Calculation?
@batpred I suspect it will be more this year. I had 9 ...
By AndrewJ , 23 hours ago
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RE: Surface mount or bury primaries for heat pump installation?
@jamespa It's rusting 🙂
By tomasmcguinness , 24 hours ago
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RE: Glass lined Cylinder for private water supply
Thank you, once again, for your replies. Yes...
By ian33a , 1 day ago
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It’s been out a few days and Amazon has already attache...
By Mars , 1 day ago
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RE: Missing flow temperature in Heat Geek proposal
Yes, and this is another point I agree. We did find a f...
By Batpred , 1 day ago
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RE: Problems with sizing a replacement for a Viessmann Vitocal 200-S
A very good point. In effect, the DHW pipework is an em...
By cathodeRay , 1 day 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 , 3 days 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 , 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 , 6 days ago
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