Whirlpool Flame Guard Water Heaters are made by American Water Heaters, which is a subsidiary of AO Smith Corp. The Flame Guard is a name for a design of a Flammable Vapor Ignition Resistant (FVIR) design that is used on all of the FVIR gas water heaters made by AO Smith Corp and its subsidiaries. FVIR designs typically use a sealed combustion chamber for the [...]