Pentair MasterTemp Low Nox Heater 200,000 BTU Propane 460731 New Model! LowNox Certified Pentair MasterTemp Low Nox Heater 200,000 BTU Propane 460731 MasterTemp Low Nox Heater By Pentair. 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. Includes liftgate option if going to residential home