Got a problem with hot water gushing out of overflow.
We have a Titan Flomaster pressurised cylinder (mains cold feed). It is an 'indirect' system. Had to turn off stop tap at cylinder's inlet from central heating to stop the overflow. The water in the expansion tank is hot and this seems to be where the overflow is coming from.
Local plumber said the cylinder needed replacing (its only 5 years old) as water from the CH system coil must be getting water in from the cylinder (at least I think thats what he said). He did suggest I get a second opinion! Does this sound possible?