can someone help me. a plumber installed a new bathroom and fixed the hot water sytem so that the oil system would heat the bathroom bathroom radiator (previously only heated by the back boiler of the fire). since then water has been pumping out of the overflow into the yard. he claims that the coil in the cylinder is bust or someting and its not his fault. Apparently the waster is being pumped up into the small tank i think (it is not the ball cock as that has been checked) i need a new cylinder now. is it possible that it is his fault or merely coincidence??