In message , "Dave Plowman (News)"
writes
My weather compensated Viessmann system boiler - quite old now - seems
happy enough to heat the water above 60c at all times, but modulates down
when driving the heating to the most economical temperature once the house
is up to the set temperature.

I'll fit the transducer and see how it goes.

I have heating to get the house to the right temperature as quickly as
possible, rather than to save money.

Would likely be different with underfloor heating left on 24/7.

Indeed. Ground floor rooms in the original part of the house (where
there is much less insulation) get most heating at the moment.
I have been meaning to ask if exterior: ground level to foundation,
insulation would pay back and, if so, what would be a suitable material.


--
Tim Lamb