When the current flowing through the contact page (Contact) connection in series with the heating coil (Main Heater) during the period of low temperature water. There would also be made contact to touch each other. Lamp display function Heat (tube). In parallel to the main heater to light. To show that the main heater is working to heat.
When the water temperature reaches the set point (approx. 80-100 ° C) to make a plan for Mumbai Catholic bent, push contacts separated by cutting current flowing through the heater element. But electricity is still flowing through the wire, heat set temperature (Warm Heater) will then flow to the heater element until full.