Header Tank Filling up

[kevplumb]

Please Help. My header tank is filling and then overflowing. Am pretty sure it is associated with using the shower from a bath / shower combined tap set, and probably cold going up the expansion. What is the best cure. If its a non return valve, where does it fit? Is there another cure? Also am very confused as I have a small worcester combi boiler and yet have a header tank. Could you also explain this. Cheers

what can i say

untill we get some info the jurys out

 

[GeoffT]

Cowley , many thanks, this explains it all, header tank for cold = nothing to do with combi. Combi just for hot. Will fit a non return over weekend. Thanks everyone for input.

 

[GeoffT]

Thats it non return valve in cold fixed it. There was no expansion pipe over the top of the tank, just back filling via cold feed. There is a massive inbalance at the shower between the cold (Gravity- 4M head) and hot (mains pressure via the combi). Its nearly impossible to get the shower cold enough (without turning combi stat right down) The bath, toilet cistern and basin all get the cold via the header tank. How about if just bypassed the header and connected the tank feed to the outlet so entire flat was on mains?