Premium Features Give You The Advantage! 616 ADVANTAGE Series Gas Water Heaters Reliance 616 Series gas water heaters deliver 40,000 Btu/hr. input, and feature FVIR technology to help prevent accidental ignition of flammable vapors from gasoline and other sources near the water heater. A sediment reducing dip tube helps extend the life of the tank and ensure efficient heat transfer. The 616 family offers premium features in several of our most popular sizes. And all Series 616 water heaters are backed by a strong six-year tank and parts warranty, and a one-year warranty on labor. Back to gas water heaters