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Hi, I drained the central heating system to change a radiator and pump. Refilled ok and all radiators bled and also water pump. I appear to have trapped air in the hot water cylinder (not cylinder to tap) but in the heater coil. I can see what looks like a bleed valve which is located on...

Hi, Please help. Our hot water system has become very noise, gurgling and bubbling - as if air is in the system. When the timer kicks in, it is initially quiet, then you can hear the pipes from the boiler in the kitchen up to the emersion heater - where it is loudest. It sounds to me...