Gas or oil fired water heaters in garages must be ___ so that gasoline vapors are not ignited?

a. 18 inches above the garage slab


b. insulated


c. 18 inches below grade


d. tested weeklyGas or oil fired water heaters in garages must be ___ so that gasoline vapors are not ignited?
a. Gasoline vapor is heavier than air and collects in highly combustible pockets. Every gas station fire fire you have ever witnessed on the evening news was caused by this..Gas or oil fired water heaters in garages must be ___ so that gasoline vapors are not ignited?
a
a
b, insulated, there must be an area between the gas or oil and the tank in which it directly sits in. This I believe is because of pressure of fumes or something.