This HeatStar HSSVFR20LPBT is a vent-free radiant propane wall heater delivering 20,000 BTU/h, equipped with a built-in thermostat and integrated blower for efficient heat distribution. Featuring a battery-powered electronic ignition and an Oxygen Depletion Sensor (ODS), it ensures safe, maintenance-free operation without the need for electricity or venting. Designed for flexibility, it includes both wall-mount brackets and freestanding feet, and can warm spaces up to approximately 700 sq ft with 99.9% efficiency while carrying a 5-year limited warranty.