FREE 40 Gal. to 50 GAL. water heater Upgrade.Natural Gas only, excludes electric water heaters. Free upgrade from 40 to 50 gallon water heater with standard water eater installation, space permitting. Standard water heater installation does not include attic installations, commercia installations, tankless installations, low boys or dual water heater installations. Not to be combined with any other offers Expires 6/12/20