The Italian-designed heater is controlled by a thermostat and temperatures can be set at between 30˚C - 90˚C.

Lights indicate when the heat is on and when it reaches operating temperature.

The unit reaches the correct temperature more quickly than standard heaters, has overheating protection and keeps the water warm long after it's turned off, to save energy.

Its separate lift-off base makes it easy to fill and clean, while the stones rest in a soft, removable silicone basket to ensure no noise is made during the treatment as they are moved around.

The heater has been designed to blend into the spa environment and comes in three colours - silver blue, light green and ice violet.

It has a six-litre capacity to enable it to hold enough stones for a full body massage.