Pentair MasterTemp Low Nox Heater 400,000 BTU Natural Gas 460736 New Model! LowNox Certified MasterTemp Low Nox Heater By Pentair 460736 Natural Gas Description: Ultra-high performance in a compact, quiet and eco-friendly design. Featured Highlights: Controls rotate to 3 positions so there’s no need to reverse the header, simplifying installation. Quick-change orifice allows easy conversion of gas sources. Compact design (21 L x 21W x 28 H) is easy to retrofit, no matter what the space challenges. Certified for low NOx emissions. Superior “best-in-class” energy-efficiency Built-in carrying handles for easy transport Top-mounted, large format digital display for easy viewing. Shipping included in the continental U.S. includes liftgate option if going to residential home.