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Please excuse spelling as im still racking my brains at 3.15am thinking about this lol

Thanks mate there are only two other mixing valves we have taken them off and blanked tails so only the cylinder is being fed via cws aftee a ling investigation we have found that when the hot water is being used it does temporally stop coming out expansion pipe..absolutely baffling as ive...

Thanks guys but everything seems normal ie height of cws to vent . Dhw is being vented through roof and is approx 7 ft above head of hot water level ..I have fitted a swing non return valve to cold feed outlet to hot water cylinder this has only moved the problem from back filling cws tank to...

thanks mate , but only taps supplied are single and ive blanked off all mixers, i did forget to mention that o fitted a swing non return valve to cold feed from storage to cylinder. it does only start to escape via roof when cold feed is on to cylinder.

my company is jcem glasgow ltd & jcem home energy type these in to google or ratedpeople website have a look at our ratings and reviews.

hi this question will baffle most experienced plumbers, i have a normal direct vented d/h/w system in a small hotel that im working on, vent on cylinder via roof and not back into storage tank, it is continuing water escape , ive put in two new thermostats at immersion heater and tested hot...