The EL 140H Waste Oil Heater’s stainless steel heat exchanger is designed to prevent corrosion, warping and weld breakage. Built to last decades, not years. 140,000 BTU (41.6 kW) per hour. The flame retention head patented design creates a hotter flame than competitor brands for complete fuel combustion and highest heat output. Less ash is produced resulting in longer maintenance intervals than competitor brands.