Keep the heat running even when the power is out with a transfer switch for heating units. The transfer switch is designed for the control of a single circuit, such as a forced-air furnace or boiler, in the event of a power failure. Power can be supplied from a portable generator or any standby source capable of producing sufficient current to operate the desired load. Uses standard grounded extension cord. Save 15% off installation with a Woolley Service Plan and be prepared the next time the power goes out.