Pump House Factory wired 208/240V; field-convertible to 120V. Heater dim.: 5″H x 21″W x 3-1/2D Provides protection to keep water, hydraulic fluid, or oil-filled equipment from freezing. Built-in thermostat (40 to 70 F) and mounting brackets. Special-Purpose Electric Heaters ETL Listed and ETL Listed for Canada.