This represents a home heating system. The heater is shown in the lower left corner of the house. When it is OFF, the heater is colored black. When it is ON, blue indicates the READY state and red indicates that the unit is HEATING.

The thermostat controls the heating system. Adjust the temperature by dragging the setpoint. The master power to the heater is controlled by the ON/OFF buttons.

The outside temperature is 32 F. A real heating system operates slowly; you might fall asleep waiting for something to happen. This simulation runs faster so you can try many experiments in less time.