Rheem ECO180XLN3-1 8.4 GPM Natural Gas Mid Efficiency Outdoor Tankless Water Heater. FREE SHIPPING AND 90 DAY WARRANTY! The Rheem ECO180XLN3-1 Outdoor Natural Gas Tankless Water Heater can provide up to 8.4 GPM at a 35° temperature rise. The 180,000 BTU Natural Gas Tankless Water Heater is designed to supply continuous hot water for up to 2 or 3 bathrooms at the same time. It heats water only when it's needed and has a 0.82 energy factor. This compact heater exceeds the requirements for many utility rebate programs. It comes with a remote digital thermostat that can be installed in almost any convenient area of the house. This heater's outdoor design requires no additional venting and features freeze protection to -30°F. This model can be used at elevations up to 9,840 ft. above sea level. Please see the specifications to view the Rheem Brochure Guide which will help you in your buying decision to ensure that you purchase the right tankless water heater model for your household needs. Outdoor tankless gas water heaters require no additional venting A 8.4 GPM tankless water heater at a 35° temperature rise can provide enough hot water to supply a 2-3 bathroom home Tankless gas water heaters heat water on demand, saving energy compared to many standard gas tank-type water heaters 0.82 energy factor meets or exceeds minimum energy efficiency standards Remote digital display shows precise temperature setting and maintenance codes Ability to link 2 like units together for high demand applications with the EZ-link cable (sold separately) Hot start programming helps to minimize fluctuation in water temperature during periods of frequent on/off operation High-altitude capability up to 9,840 ft. elevation about sea level Environmentally friendly ultra-low Nox burner meets SCAQMD rule 1146.2 requirements Product Depth (in.): 8.875 Product Height (in.): 23.625 Product Width (in.): 13.875 Vent diameter (in.): 0.0 Water Connection Size (in.): 0.75 Application Type: Commercial & Residential Energy Factor: 0.82 Finish Family: Gray Flow Rate @ 35 F Rise (gallons/min): 8.4 gal (US)/min Flow Rate @ 45 F Rise (gallons/min): 6.7 Flow Rate @ 55 F Rise (gallons/min): 5.4 Flow Rate @ 65 F Rise (gallons/min): 4.5 Fuel Type: Gas Gas Connection Size: 0.75 Gas Product Type: Commercial & Residential Gas Type: Natural Gas Gas Type: Natural Gas Indoor/Outdoor: Outdoor Maximum Temperature (F): 140.0 Minimum Activation Rate (gpm): .40 Minimum Temperature (F): 85 Pilot Light: No Point-Of-Use: No Product Weight (lb.): 54lb Total BTU: 180000 Btu Vent Type: Single Wall Water Connection Location: Bottom Water Heater Features: Ultra LoNox Certifications and Listings: 1-UL Listed,CSA Listed