It is wasteful and ineffective to leave a hot water cylinder uninsulated just so as it can contribute to the home heating.

• The cylinder should always be lagged to minimise heat loss and keep the water hot for as long as possible. It is better still if the water cylinder has factory-applied insulation. /

• If your hot water is being heated by the central heating boiler, you should fit a cylinder thermostat to moderate the temperature.  /