Water Heater contained by garage - Code? Does water kiln in the garage enjoy to be on platform 18"...

Does water kiln in the garage enjoy to be on platform 18" or does it have to be vent outside, or both?
How do I check the grease height surrounded...
Answers:    Is it a gas WH?
If it is it should be vented.
It should be 18" sour the floor.
I in recent times get a camp grill....
That varies by city, township etc. Call your local building inspector and ask for codes.
Venting is critical.!