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yes it's a flowmatic eyes are as bad as the boiler. thanks I'll get the guy out tomorrow.

cheers ,it's a vokera 20-80 rs howmatic to be exact. so it's relatively simple to put right and not too expensive?

I have a ten year old volkera combi boiler which works fine as far as the central heating is concerned but the hot water has a nasty habit of turning cold. If I open the tap by half this seems to allow the flow of hot water but if I open it fully the water soon turns cold. Has anyone got any...