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John

(Andrew Gabriel) wrote in
:

In article ,

at the moment the boiler thermostat is set to 65 deg and
the cylinder
to 58 deg.

my question is it better to set up to boiler thermostat to
max ? will
the boiler still work in condensing mode ?

The boiler would be running at its most efficient when the
return water
temp to the boiler is 54c

It still gets even more efficient at lower temperatures than
that.
My condensing boiler runs at 40C return temperature for
heating,

True but I was replying to OP and making some assumptions
based on his plumbers comments
I.e. I would be surprised if radiators have been replaced and
resized to allow such a low return temp.
And I think it's only the ecomax combi that has a separate HW
temp setting.