Low flow activation with a minimum flow rate of. 26GPM ensures hot water is received even in low-demand situations. Ultra-Low Nox burner meets Scaqmd rule requirements of safety with low emissions. While our exclusive Guardian Overheat Film Wrap prevents our units from reaching dangerous temperatures others can. Add in our maintenance notification settings, self-diagnostic system, and EcoNet enabled mobile app feature (additional kit available), buying the Rheem RTG tankless water heater makes perfect sense. Included are a digital remote control and 10ft. of thermostat wire. As this unit is for use outdoors no venting is required. Best if used with up to 3 bathrooms; .81-.82UEF (.82EF Canada), 180,000BTU efficiency. Professional installation is required otherwise warranty void. Warranty: 12yr heat exchanger, 5 yrs parts, and 1 yr labor.