Hi

After returning from Christmas with the inlaws my neighbour informed
me that one of the loft overflow pipes had been dripping whilst we
were away. I decided to have a root around tonight when I put the
decorations away for another year and was suprised to find the water
in the expansion tank was hot!

We have a Baxi Solo 3 PF with a Honeywell Y Plan control system with
more than the minimum head stated in the installation guide. I then
remembered that the plumbed who last serviced the boiler muttered
something about the pipe layout not being particularly good and
causing turbulence in the flow pipe.

I'm guessing that the dripping overflow is simply condensation from
the hot water, however, why is the tank getting hot?

Regards

Ross