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Andy -Thanks for the reply - sounds like I need a new plumber! Forgive my ignorance, but if it's the gate valve that's faulty, why do the immersion heaters need to be replaced? Cheers

I'm in Walsall, West Mids - thanks!

Hi, I've been having some issues with my water tank/economy 7 water heating - I'd be really grateful if anyone can advise. I have a combi tank with two immersion heaters linked up to an old style Sangamo economy 7 timer (with a 24 hour dial which drives the economy 7, and 1 hour boost button)...