I am moving my water heater.

I know I am supposed to have a vent to the top of the water heater for combustion air.

What about the bottom?

Does the answer depend at all on if the water heater is enclosed or just sitting in the room (a studio/tool-room) ?

Thanks!

Quote:

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Originally Posted by ptnoble

I am moving my water heater.

I know I am supposed to have a vent to the top of the water heater for combustion air.

What about the bottom?

Does the answer depend at all on if the water heater is enclosed or just sitting in the room (a studio/tool-room) ?

Thanks!

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Are you talking about a gas fired water heater? That type must have a vent cap and a metal chimney on the top to conduct the product of combustion to a chimney or out of doors. Should the tank be in a small sealed room, then outdoor air should be supplied, better at the low level. In a large room such as an unfinished basement then you may not need combustion air. Should a gas furnace exist that is not high efficiency then suggest combustion air be supplied at a low level to satisfy both appliances.
PS high efficiency units get the combustion air from outside when installed originally.