Header Tank Filling up

[GeoffT]

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

 

[doitall]

Do you mean header tank, nothing to do with the domestic water or storage tank which feeds the cylinder

 

[kevplumb]

Also am very confused as I have a small worcester combi boiler and yet have a header tank. Could you also explain this. Cheers

juniour on an open vented system

 

[GeoffT]

yes the cold water storage tank in the loft is what I mean. I always thought these were not used in a combi system.

 

[kevplumb]

have you got a hot water cylinder

 

[GeoffT]

Not as far as I know, actually its my daughters flat. it is possible as I am aware of what she calls an "airing cupbouard" do you have these with a combi?

 

[kevplumb]

whats in it

and don't reply towels

 

[GeoffT]

Kevplumb. Thanks for trying to help, reckon there maybe a tank as well as a combi. She is away, so I cant ask. will post again when I have the info.cheers

 

[GeoffT]

She says there is no hot water tank

 

[kevplumb]

if there is no hot water cylinder and the header tank is for a combi

running the water shouldnt make a jot of difference

 

[GeoffT]

What about the cold and the hot somehow getting together at the shower mixer and pushing up the expansion pipe?

 

[kevplumb]

ang on how high is the header tank

and what model of worcester

this has got me thinking now (not always a good thing )

 

[GeoffT]

tank is in loft, boiler half way up wall in kitchen on floor below say 3M head boiler to tank. Mixer taps (bathroom) are down another half set of stairs, probably level with floor of the kitchen say 4-4.5M head to tank. No idea on model of worcester except its pretty small in physical size (only 4 room flat. Thanks for your patience

 

[kevplumb]

bear with me on this approx how big is the tank

 

[cowley]

If the cold feed for shower mixer is fed from storage tank and hot is from a combi boiler which is mains fed you have unequal pressures and in some rare occasions water can go back up cold feed and give the symptoms you describe, if you fit a non return valve to cold feed to shower mixer pipe this will cure it.