Mhu80-80,000 btu, big maxx natural gas unit heater, 80,000 btu per hour, heats up to 2000 sqdt, spark ignition features self-diagnostic control module, includes 2 angle brackets for ceiling mount, ships as natural gas, includes ng to lp conversion kit, 4" flue size, category 1 vertical: category 3 horizontal venting, 1/2' gas connection.