The Empire Direct Vent Wall Furnace-Wall Thermostat-Millivolt-35,000 Btu - NG has been designed to heat larger areas while remaining convenient and economical. With Empire's Direct-Vent units it's possible to deliver ample, room-filling warmth. Each furnace is stylishly crafted and fits against an outside wall. This Direct Vent Furnace includes a wall thermostat and emits 35,000 BTUs. This unit is for Natural Gas.