AdvantagePlus Sealed Combustion Gas--------------------------------------------------------------------------------Available Capacities:100,000 - 1999,000 BTU/HR.Available Warranties:3-year limited tank, 1-year limited parts warranty--------------------------------------------------------------------------------Features:316L stainless steel tank construction (requires no anode rods). No chimney required - vents up to 40 feet using 3" schedule 40 PVC, CPVC or ABS pipe - direct vent using plastic pipe. Thermal efficiency of 95% dramatically reduces operating costs. 85 equivalent feet of vent length. Low NOx emissions. Meets SCAQMD Rule 1146.2. High impact plastic jacket eliminates dents. 2" of non-CFC, polyurethane foam insulation. Less than 1/2 degree per hour heat loss (R17). Corrosion resistant, high efficiency 90/10 cupronickel heat exchanger. Self-diagnostic electronic control with digital readout for water temperature, set point and differential. Removable front cover allows easy access to equipment (24" service clearance recommended). Temperature range from 70ºF to 160ºF (maximum temperature setting of 180ºF available on HE45-160 and HE45-199 booster models only). Zero clearance to all combustible surfaces. Factory installed AGA/ASME rated T&P relief valve.