I suspect I've got a leaking indirect coil in the hot water tank as the cold water is warm and the tank has overflowed recently, the overflow from the hot water goes back into the cold water. I've replaced the termostat on the hot water tank, is there any good diagnostic to prove that a leaky coil is the problem? I think I can hear the header tank for the heating system dripping and I presume that means I'm in trouble and I need a new tank, last time it took ages to get as its a funny smaller tank or is the coil repairable?
I'll be checking this tomorrow when the place is a little quieter and I can play with the tank thermostat post showers, but is there much else to do but call in the plumber?.
Somewhat glumly
Peter