The Polaris? has a high grade 444 stainless steel tank with brass connections for years of dependable, trouble-free service - no anode required. A submerged combustion chamber with spiral flue provides up to 96% thermal efficiency and ultra-low standby heat loss of approximately 1%.
??? 95+% Thermal Efficiency.
??? Stainless Steel Tank and Combustion Chamber/Flue.
??? Sealed Combustion.
??? Vents (Intake and Exhaust) with 2" (models having less than 175,000 Btu Input) 3" PVC ABS or CPVC Schedule 40 Plastic Pipe.
??? 2" Non-CFC Polyurethane Foam to prevent heat loss and reduce energy costs.
??? Factory-installed Temperature & Pressure Relief Valve.
??? LED Operational and Diagnostic Lights.
??? Negative-Pressure Gas Valve.
??? Electronic Hot Surface Ignition.
??? 24-Volt Thermostat Control.
??? Tested and listed with CSA International in accordance with the latest addition of ANSI Z21.10.3 CSA 4.3.
??? ASHRAE Standard 90.1-1999 - thermal efficiency requirements are met or exceeded. Zero clearance to combustibles.