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Last seen: Oct 27, 2026
1kW=1kWh per hour (kWh = kilowatts times hours, ie 1 kilowatt for 1 hour. Kilowatt hours per hour is thus kilowatts times hours divided by hours, ie ...
Consumption is entirely dependent on house construction. My house, a 1930s solid wall build with about 70% retrofitted IWI, 30cm loft insulation, d...
I agree with those who say don't/you cant do it, see regulation 5.4. The only 'get out' is that this is guidance which, 'in the opinion of the Sec...
I don't have the full specs to hand (Grrant don't publish them AFAIK, but Chofu, the oem, might) however a 4:1 turn down for an a2w pump is a good fig...
All a2w heat pumps work this way so far as I know, because it makes sense, Vaillant is no different. Ditto gas boilers with weather compensation. O...
I guess that in principle, with the right plumbing, you could run both together at the ft of the dhw. Lousy efficiency and the output is divided betw...
And gas boiler that operates weather compensation does exactly the same, for the simple reason that you need a higher flow temp for dhw than for space...
Yes mine also. It seems a sensible approach to me, much more sensible than making DT across each emitter the same in a system where the aim is to ope...
I completely agree. However DT can only change by a small amount (~5C) in a tolerably well adjusted setup and each degree it changes is equal to half...
I think because 6-8kW, which a 22mm pipe can deliver at a typical DT of 5, gives a sufficiently fast recovery time for many people and... 22mm gives...
Well exactly that. Much of the discussion above focussed on 'delta T' being in this case the difference between flow and return temperatures. But th...
I must say that the recent posts about buffers are most encouraging. When I first embarked on this journey it seemed almost heresy to suggest on a pu...
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Latest Posts
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RE: I need help with Ecodan ASHP
@f1p It turns out there have been a solar panel install...
By Andris , 2 hours ago
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RE: 15kw pump for 225m2 1990's house - over kill?
@seaviews your installer would be right to say that the...
By GrahamF , 2 hours ago
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RE: Vaillant ecoTEC Plus - Flow Temp and Set Up
@trebor12345 That curve looks healthy to me. I woul...
By JamesPa , 4 hours ago
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RE: Tradespeople on Their Phones: What’s Acceptable When They’re Working in Your Home?
Actually, that's a very important point. I've only ev...
By Majordennisbloodnok , 11 hours ago
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RE: The Changing Jet Stream Could Challenge UK Air Source Heat Pumps
@susannasaunders can I just add to @rob-of-york s comm...
By JamesPa , 14 hours ago
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RE: Aerotherm and weather compensation
These are likely inked. The basic explanation is tha...
By JamesPa , 14 hours ago
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RE: Electrical works for air to air heat pump
agree with above. I have not had extra costs added wh...
By Batpred , 15 hours ago
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Good to hear that you found a solution. Absolutely a...
By Batpred , 16 hours ago
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RE: Are there any comparisons of DHW heat stores around?
@sarahemmm I have done things the opposite way round I ...
By Toodles , 1 day ago
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RE: How will removing the standing charge on gas bills benefit heat pumps?
The BUS grant funding for 2026/27 will run out at the c...
By Rob of York , 2 days ago
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RE: Say hello and introduce yourself
@e-a-west as the good Major said, welcome to the forums...
By Mars , 4 days ago
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RE: How much of your renewable and home setup would still work if the internet went down?
Yes I actually have a copy of a tool that whenever a ce...
By EtchedPixels , 5 days ago
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RE: Indevolt Batteries UK Support & Info Thread
@editor Hi, To resolve this, please tap on the A...
By Indevolt Tech , 5 days ago
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RE: Double or Triple Glazed Windows?
Posted by: @singlespeed With 9 years repairing windo...
By Rob of York , 5 days ago
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