Rinnai V65EP 6.6 GPM Outdoor Low NOx Tankless Propane Water Heater no fabrics Imported Energy Factor of .82 for Natural Gas and Propane Certified for Installation in Manufactured (Mobile) Homes. 1/2inch Gas Line Compatible Enhanced scale detection lessens possibility of serious, long-term damage to unit Temperature lock prevents accidental or unauthorized changes to water temperature Complies with South Coast Air Quality Management District 14 ng/J or 20 ppm NOx emission levels 150,000 Max BTU