The Heatstar High Intensity Radiant Overhead HS4040SPNG Natural Gas Auto-Spark heaters direct line of site radiant heat to floor-level objects, which in turn, heat surrounding air to the desired temperature. Personnel and objects at floor level enjoy instant, cost-saving comfort. Ideal for use in drafty or windy areas like a loading dock or auto mechanic bays where doors are open during winter conditions. 99.9% efficient, it transfers almost all of the fuel it burns directly into clean safe radiant heat. Has an auto-spark ignition system, a safety shut-off on the pilot and burner, and ships with a 120V/24VAC/40VA transformer. Heatstar high intensity heaters are protected by a 10 year, pro-rated burner assembly warranty and a limited one year gas control warranty. Consult the user manual for installation instructions and for clearance to combustible guidance.