Last seen: Sep 21, 2025
One vital question I should have asked. Is '2kwh per hour' energy consumed (as measured eg by your electricity meter) or energy delivered (as measure...
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...
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