Rheemglas ® Energy Miser ® Direct Vent Gas Water Heater--------------------------------------------------------------------------------Available Capacities:40 and 50 gallon modelsAvailable Warranties:6-year limited tank , 6-year parts: With ProtectionPlus the 6-year limited tank warranty becomes 10 years!--------------------------------------------------------------------------------Features:Adjustable coaxial vent allows flexibility of installation - uses outside air for combustion and requires no electrical power Aluminum vent and cap base to prevent staining of building exterior Heat saving flue baffle design Brass drain valve Temperature and pressure relief valve included Exclusive Rheemglas ® tank lining resists corrosion and prolongs tank life Gas control and combination thermostat Anode rod equalizes aggressive water action Relief valve opening - side connect for fast economical installation Durable plastic formula dip tube