On 27 Oct 2008 15:30:56 GMT, Andrew Gabriel wrote:

Most efficient is to set the boiler temperature low enough such that
the room stat never quite switches off.

That may not be true.. my boiler is most efficient at full output and
is a few % less if the output is reduced.

I suspect full output is referring to burner power, not the water
temperature.

I'd add full output with the return temperature low enough such that
maximum condensing occurs.

--
Cheers
Dave.