Yes the cylinder mate. Ive had a look and there are a lot of copper pipes in the airing cupboard attached to it!!

Our heating system is a gas boiler in the kitchen that does the central heating AND the tap water..

the hot water cylinder in the bathroom however has a heater built in to it attached to a timer that can also be used.. its this an emmersion heater??

Ive currently drained the entire central heating system as I have removed radiators for redecorating/plastering, so the boiler is switched off. We use this electric timer / emmersion for our hot water at the mo