DESC: Glo Warm blue flame heater. Requires no electricity. Wall mount brackets included. 99% fuel efficient. Includes: Piezo ignition, thermostat, and oxygen depletion system. Available in both natural gas and propane. Thermostatically controlled. The thermostatic controls operate by gradually modulating the heat output and flame height from the selected setting to lower settings, or pilot, in order to maintain a consistent room temperature. Ivory. Use model No. GA4550 base if needed. No. GWP20TA: Propane gas, 2 heat settings, 10,000 to 20,000 BTU, heats 700 sq. ft., 18 1 4'' W. x 26 1 4'' H. x 8 1 4'' D. No. GWN30TA: Natural gas, 2 heat settings, 15,000 to 30,000 BTU, heats 1000 sq. ft., 25 1 2'' W. x 26 1 4'' H. x 8 1 4'' D. %