The Kenmore tall natural gas water heater is energy-efficient, with foam insulation and has a cobalt blue glass-lined tank with a large anode rod to protect the tank from corrosion. It also includes a self-cleaning cold water inlet tube which reduces and protects against mineral build-up in the tank. A 30-gallon natural gas water heater is the recommended size for a 1- to 2-person household with typical water use.