Fixtures & Water HeatersQuestion 186 of 360
A gas water heater is installed in a residential garage. To reduce the risk of igniting flammable vapors, the ignition source should generally be elevated above the floor by at least:
a.18 inches
b.6 inches
c.12 inches
d.30 inches
Explanation
Gasoline and other heavy flammable vapors tend to settle near the floor of a garage. Elevating the ignition source, such as a pilot or burner, at least 18 inches above the floor reduces the chance of ignition. Listed flammable-vapor-ignition-resistant (FVIR) heaters may change the specifics, but the 18-inch elevation is the traditional rule.
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