How high should a hot water tank with an open source of ignition be elevated above the garage floor?

The correct height for a hot water tank with an open source of ignition to be elevated above the garage floor is 18 inches. This requirement is set to help prevent the possibility of ignition of flammable vapors that can accumulate in a garage setting, which is common due to the storage of volatile substances such as gasoline and solvents.

By positioning the hot water tank at least 18 inches above the garage floor, any flammable vapors, which are typically denser than air and may settle near the ground, are less likely to come into contact with the ignition source from the tank. This safety measure significantly reduces the risk of fire or explosion, aligning with building codes that aim to ensure safe installation practices.

In a residential environment, particularly in garages where vehicles and potentially hazardous materials are stored, compliance with this elevation requirement is crucial for fire safety.