Table lamp electric patio heater Northgate. This is the Northgate table lamp style electric patio heater. This beautiful electric heater can heat up to 12 feet diameter. It is perfect for cool evenings. Its heater has a 1,200 W halogen bulb which is equivalent to approx. 4,095 BTUs of heat. It has 8 Ft. cord that uses a standard 120V grounded outlet. It has an automatic shutoff tilt switch. It is made of weather resistant hardware and requires simple assembly.