FVIR flammable vapor ignition resistant. Ideal for retro-fit replacement of electric water heater. Perfect where high efficiency furnaces are used. Allows venting up to 32 feet with 2" PVC, ABS, or CPVC pipe. Allows venting up to 75 feet with 3" PVC, ABS, or CPVC pipe. Designed for installations at altitudes up to 7,700 feet. Electronic ignition eliminates standing pilot. Compact, quiet blower with standard 110-volt connection. Factory installed temperature and pressure relief valve. Extra thick rigid foam insulation helps conserve energy. Allows vertical or horizontal termination. Meets or exceeds National Appliance Energy Conservation Act (NAECA) requirements. 6 YEAR LIMITED WARRANTY ON TANK & PARTS.