Hi,

I moved house a few months ago, into a house that had cold radiators.
No matter how high the thermostats were turned up the house wouldn't
warm up.

I noticed the indirect water cylinder had a valve on the "return to
boiler pipe". After closing this valve (not fully) the house got to a
nice temperature. I think previously at least 50% of the hot water from
the boiler was passing through the cylinder's heat exchanger back to
the boiler.

When it comes to summer, and we switch off the central heating, is my
hot water pump going to break as the valve has been almost shut?
Any help is appreciated.

Ta.