ABSTRACT
First step of the immersion heater changing include isolation and disconnection of the electrical supply. Once the inlet has been located one should trace the pipe away from the cylinder until they reach a valve; this is normally a gate valve. If they are concerned about the valve it will probably be better to drain the cold water storage tank, which is usually located in the loft. This will be where the water is stored to supply the hot water cylinder and cold taps in the bathroom. Changing an immersion heater on an unvented cylinder is usually a lot easier than changing one on a vented cylinder. This is because the isolation valve is normally a lever type that is situated close to the cylinder. The cold fill pipe is normally the one that enters the cylinder at the lowest point. Quite often, this is where one will find the drain off valve as well.
