Kozy World GWD208 20,000-BTU Vent-Free Dual-Fuel Gas Wall Heater 20,000-BTU dual-fuel gas wall heater for spaces up to 700 square feet Electronic piezo ignition system provides easy start-ups; dancing blue-flame burner Safe-watch pilot assembly, built-in oxygen-depletion sensor, and pressure regulator for safety Built-in thermostat; wall-mounting brackets and detailed instructions included Measures approximately 7 by 19 by 23 inches