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Last seen: Nov 12, 2026
For me the sole purpose of the glycol or antifreeze valves is to provide backup protection if the power fails for any length of time; the freeze stat ...
Most heat pumps have specs on minimum clearances, perhaps check this. That said I agree with @transparent that an open frame construction would be ...
Agree. I changed mine because I reheat only once per day, which is fine so long as hysterisis set too high cause it to skip a cycle. However you see...
Thats interesting and exactly what one installer said to me. We seriously need to do a survey of door blower testers - @editor have you any contacts...
Based on my own experience there are installers out there who will use more realistic values for ACH and/or take note of measured data. They are in t...
My 200l Vaillant DHW tank falls from 70 to 65 (immediately following a legionella cycle) in about 11 hrs, just shy of 0.5C/hr. Yours is quite a lot f...
Completely agree that 'efficiency' is strictly incorrect terminology. The efficiency (of a heat pump) would be (something like) heat out/theoretical ...
I completely agree based on my personal experience, and I have now heard a sprinkling of installers say this, but is there any wider evidence that you...
... If as a result you can turn the flow temp down then that could make quite a difference!
So your heating COP is (30-4)/(10.5-2.5) = 3.25 Your DHW COP is 4/2.5 = 1.6 As you imply sacrificing COP for low cost electricity saves money. Its...
No process is 100% efficient, so yes some is lost from pumps, electronics, pipework etc. I think Vaillant monitor deltaT and flow rate to calculate e...
Overall about 43/15 = 2.85 However this is made up of space heating COP and DHW COP, which normally are quoted separately, because they are typicall...
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Latest Posts
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Should I change my cylinder when changing from a gas boiler to a heat pump.
I have 178 L Gledhill unvented cylinder which was fitte...
By David , 1 hour ago
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Should I change my cylinder when changing from a gas boiler to a heat pump.
I have 178 L Gledhill unvented cylinder which was fitte...
By David , 1 hour ago
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RE: Plug and play solar. Thoughts?
Impressions so far from the one I've installed are that...
By EtchedPixels , 3 hours ago
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@batpred The Daikin temperature probe protrudes from th...
By Toodles , 6 hours ago
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RE: Air source heat pump roll call – what heat pump brand and model do you have?
@editor And as an occasional contributor, may I say wel...
By Toodles , 8 hours ago
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RE: Should Households Who Can Afford It Pay More for Energy to Help Those Who Can't?
They don't have to try. Our entire system is d...
By EtchedPixels , 9 hours ago
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RE: Why don't people choose heat pumps?
Fair enough. I guess I was thinking of pipes that run ...
By JamesPa , 9 hours ago
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RE: How Can I Prove Coal Was My Main Heating Source Without Receipts?
Got excepted for the grant now so thanks for the replie...
By Chilli304 , 13 hours ago
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Daikin Altherma 3 R F+W, room thermostat control, weath...
By JanHarley , 13 hours ago
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RE: Buffer tank on a 2 x 14kw Ecodan system
Pretty much as I had guessed in my crude scaling from m...
By JamesPa , 16 hours ago
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RE: Help me keep the faith with my air source heat pump installation
Well you have a vibration generator running at some fre...
By bobflux , 1 day ago
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RE: Who's your electricity provider and what's your tariff?
@downfield Thats a decent rate, I’m shocked they hadn...
By Papahuhu , 2 days ago
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RE: Adventures in heat loss calculations
@toodles thanks! So as suspected, around a doubling of ...
By SusannaSaunders , 2 days ago
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