Willis Heater

HOW IT WORKS:

The internal heating element, controlled by the integral thermostat, heats the water to a setting of about 40 deg.C. If no water is being drawn from the taps, the Willis Heater acts like a “boiler” in that it causes water to circulate around the path marked with yellow arrows heating up the water in the cylinder as it does so, and until the Willis 

Heater thermostat reaches the set temperature. When the hot taps are used, water is drawn from both the cylinder and the Willis Heater along the path shown by the red arrows. Cold water refills the cylinder and also enters the Willis Heater along the blue arrow path.