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Last seen: Aug 19, 2026
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...
It doesn't directly contribute. The energy in basically powers the compressor (plus a bit for other things) and the energy out is the heat in the ga...
Here is the measured data (2 years worth of half hourly meter data) my selection was based on. You don't need 2 years worth and the 24, 12, 6,3 hour ...
I have done various thing, basically my approach was 'do a sensible and practical upgrade whenever a room is decorated or the opportunity arises'. Ov...
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Degrees of Separation
Latest Posts
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RE: The good, the bad and the not that great – my heat pump installation
@burtis, I’ve followed this thread pretty much from the...
By Mars , 5 hours ago
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RE: Starting Our Heat Pump Journey: 1962 build 3 bed detached house
First time poster here but I can share my experience as...
By SCH , 11 hours ago
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At the risk of going on: A slight side issue for a foru...
By Bart , 17 hours ago
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RE: Is it the house or the equipment?
...which, I've found out, is pretty much impossible to ...
By Majordennisbloodnok , 18 hours ago
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RE: Mitsubishi Ecodan FTC6 settings
The Mitsi remote thermostat should not be plugged into ...
By F1p , 1 day ago
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RE: Do I add Air Con or MVHR to existing A2W ASHP?
@lizzie Thank you, very interesting and useful informat...
By Toodles , 2 days ago
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RE: PV and battery long payback - sense check query
@jamespa I was just commenting on the speed, not sug...
By Batpred , 2 days ago
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Readers here please note that Derril Water and many oth...
By Transparent , 2 days ago
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RE: Advice on Vaillant Sensocomfort
Oops, I meant Sensocomfort (the UI to the controls)
By Batpred , 2 days ago
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RE: Heat Pump Training vs. Real-World Installation
Our instal was very much the opposite. White haired blo...
By Batpred , 2 days ago
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RE: Flushing system, cleaning and inhibitor
While skim reading a manual for our Vaillant HW tank, I...
By Batpred , 2 days ago
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RE: 'Chinese Diesel Heater' to heat the home .....
Old thread but I'm new to the forum so new to me. How...
By BlizzardGreen , 2 days ago
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I'm not sure why you would want to make it more difficu...
By JamesPa , 3 days ago
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