Peter wrote:

Many people install based on price not performance. So loads of people
go for 24kW models. Lots of these will be old 70% efficient jobs that
can only throw 18kW of heat at the water.


Is this what the power rating is? So a 24kW model *uses* 24kW but does
not *provide* 24kW of power?

Yes exactly. Most times you see a power rating stated for a boiler, it
is an input power - i.e. that is its rate of energy consumption. The
amount that comes out in a way useful to you (as opposed to just
straight out the flue), is a measure of the efficiency.


--
Cheers,

John.

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