"Andrew Gabriel" wrote in message
...
In article ,
"dennis@home" writes:


"Andrew Gabriel" wrote in message
...


Agreed.
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.
Don't ask me why, that is what the manufacturer says.

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

True but at full output it will heat the water rather quickly,
So it will only fire for a few tens of seconds if the water temp is set low.