This redesigned direct-vent gas water heater from A.O. Smith offers energy factors of up to .60 thanks to 2 inches of foam insulation added to the heater. Four indoor models are available in 40-, 50-, and 75-gallon capacities. The factory-supplied kit features several adjustable venting features that can expand up to 80 feet for quick and easy installation. Other features include intelligent control logic, a self-powered electronic gas valve, and a CSA-certified/ASME-rated temperature and pressure valve.