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Last seen: Sep 7, 2026
Pre-installation, standard heat loss calcs done by me and also separately by my installer (latter had one typo which did matter but was easily correct...
I'm not sure that answers my question (is the divide by 2000 rule of thumb unreliable?). You divided 16000kWh pa (current/historic fossil fuel use) by...
I do - see my previous post! Plus it also happens to be the figure decent heat loss calculations come up with.
I should have explained more. The 300% efficiency is actually based on my monitored energy in/energy out (energy out divided by energy in), and is a l...
I am not sure the divide fossil fuel kWh by 2000 rule of thumb works. I was going to remark 16000kWh per annum is rather on the high side, suggesting ...
All sound stuff apart from the TRVs - aim not to use them at all, except when you have no alternative (which should be rare, preferably never eg use t...
That sounds promising. Do you still have the heat loss/rad sizing calculations used to select your current rads? If you do, they may add some more inf...
I strongly endorse this. Some of the quotes I had from various goons claiming to be heating engineers had hopelessly out of whack rad specs. For radia...
I have a small old leaky listed building with limited wall space. As a very general rule of thumb, if you have correctly sized radiators for a fossil ...
I'm not sure they do. Take the first chart in your second to last post, this one: I take it this is what we conventionally call LWT, the tempe...
@jamespa - I owe much of my meagre but at the same time much improved understanding of the thermodynamic principles involved to your many generous con...
We have been here before, on the question of continuous vs intermittent heat pump running, and the effects on costs and comfort. My conclusions to dat...
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Degrees of Separation
Latest Posts
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RE: Where heat loss surveys seem to go against practical reality
@cathoderay If the heat pump occasionally over produc...
By Rob of York , 10 minutes ago
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There arent many of these hitachi pumps around here so ...
By JamesPa , 2 hours ago
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RE: Next steps on my ASHP journey: Radiators and Pipework
I think trying to deduce flow rate from an instantaneou...
By JamesPa , 3 hours ago
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RE: 7kW EV Charger Options Advice
I’ve had an EV with wall charger for over 3 years and t...
By AndrewJ , 4 hours ago
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My Adapt is finally installed and running! Almost a yea...
By tomasmcguinness , 5 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 , 3 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 , 3 days ago
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RE: Surface mount or bury primaries for heat pump installation?
@jamespa It's rusting 🙂
By tomasmcguinness , 3 days ago
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RE: Glass lined Cylinder for private water supply
Thank you, once again, for your replies. Yes...
By ian33a , 3 days ago
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It’s been out a few days and Amazon has already attache...
By Mars , 3 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 , 3 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 , 3 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...
By Toodles , 5 days ago
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