How do I bathroom / kitchen / extension? etc.

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Nahguavkire

With underfloor heating, no problem at all. With modern aluminium radiators you should be able to get very low too. Ancient cast iron or chappy steel radiators would admittedly require a higher temperature.

Here are the heating curves/ COP for the unit I'm installing. (Edit as I uploaded the wrong chart)
Also keep in mind annual average air temperature in London is 10.8°c and average temperature in January (coldest month) is 4.8°c...

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Howard in reply to @Nahguavkire

With underfloor heating, no problem at all. With modern aluminium radiators you should be able to get very low too

Looking at the charts, as long as you don't need more than 7-8kw of heat, you are golden.

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Nahguavkire in reply to @Howard

That chart is for a unit rated for 8kw nominal output. If you need more you can just get a bigger one!
The project I'm finishing up at the moment in our workshop is a 120kw air source plantroom with two 60kw HPs...

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