Willis type external immersion heater shell, complete with 3kW element and thermostat

The Willis Heater is fitted in parallel to the main, vented, domestic hot water cylinder and heats the water in the main cylinder from the top down. It saves money and energy, as you only heat the water you need.

Item includes : copper cylinder / shell, 3kW element and thermostat, supplied un-assembled (just like it is shown in the picture).

Cylinder has 15mm compression pipe connections.

Not suitable for use in hard water areas.

Not suitable for use as a standalone water heater, a Willis Heater must only be used in conjunction with a vented hot water cylinder.