This is my first post on the forum, and know little about plumbing. But here is my problem.
My header tanks keeps overflowing. I have replaced the ball valve and checked this several times for leaks to which there is none. So I can confirm that it is not the Ball valve. The tank in the loft continues to fill up over a number of days and overflows via the overflow pipe outside. We have not had our central heating on or the emersion heater and still it is filling up. HOW????
I tested this today, no heating or emersion heater and did not use the hot water for several hours and the tank water depth rose by about an inch.
Our system is an indirect vented system with tank in loft. The Tank is a Showmax Supercal Cylinder.
Can someone please help with advice.