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Last seen: Sep 6, 2026
Righty ho, here we go! The question is: does the lower mean LWT caused by cycling critically reduce output at low OATs? Current best estimate of hea...
I agree, but is that by design or by accident? There is also some evidence of overshoot at the end, not beginning, of the cycles in the chart I posted...
@jamespa - agreed. But never one to sit still, I have been thinking about another possible cause for the low OAT deficit, which does involve, indeed i...
@jamespa - all agreed, even most of the part in the middle about the PWM cable connection/disconnection test, with the minor difference that while the...
I don't think we are far apart, what differences there are are down to semantics and writing styles. I note you tend to use explicit often bracketed c...
To I hope clear up some points: I can say what I like (within the usual limits) but equally I am open to refutation! This is actually a woolly bi...
Perhaps the most interesting period in the chart is not when the heat pump is misbehaving, but when it is behaving, ie running at steady state, eg be...
Thanks. In reply: The flow temps are high by design. The rads (all rads, no UFH) are as large as can be (and are are all bar two K3s) but the height...
Part 4: Software Installation - OS (operating system) and Home Assistant Disclaimer(and this is entirely my fault): because I did my own install...
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Latest Posts
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RE: Next steps on my ASHP journey: Radiators and Pipework
At a practical level, you'll also want a heat pump syst...
By Old_Scientist , 1 minute ago
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RE: Where heat loss surveys seem to go against practical reality
Posted by: @cathoderay All I am doing is emphasising...
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 , 1 day 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 , 2 days 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 , 2 days ago
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RE: Surface mount or bury primaries for heat pump installation?
@jamespa It's rusting 🙂
By tomasmcguinness , 2 days ago
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RE: Glass lined Cylinder for private water supply
Thank you, once again, for your replies. Yes...
By ian33a , 2 days ago
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It’s been out a few days and Amazon has already attache...
By Mars , 2 days 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 , 2 days 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 , 2 days ago
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RE: Solar Power Output – Let’s Compare Generation Figures
@tim441 Here are those same three month periods for 202...
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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 , 5 days ago
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RE: Adventures in heat loss calculations
@rob-of-york — thanks for posting this, all very useful...
By cathodeRay , 1 week ago


