The only other option is an electric water heater which requires no vent.
Venting gas water heater through wall.
This venting may either be dedicated to the water heater or can be shared with other atmospheric vent appliances such as a furnace.
All solid liquid or gas fueled water heater whether they are tank type or tankless must vent through the roof unless they are direct vent.
Direct vent water boiler.
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Atmospheric gas water heaters vent their exhaust through a vertical or upward sloping metal duct vent to exit the home.
The atmospheric water heater is very common.
On 2019 11 07 by harry.
Venting a conventional or typical gas fired water heater straight out through a sidewall using plastic pipe would be failure to follow the manufacturer s instructions and most likely would be unsafe.
For clean comfortable heat when and where you want it the gas flame is completely sealed inside away from all contact with room air.
Exhaust gases are vented outdoors through a separate vent duct or through a separate chamber of the same pipe this requires a double wall vent duct.
Venting a hot water heater through the wall atmospheric water heater.
The space saving direct vent furnace design mounts to an exterior wall and the adjustable vent assembly adjusts to fit walls from 4 1 2 in.
The direct vent water boiler is another type of water heater venting that you should know.
On 2019 11 11 by mod vent gas water heater out through side wall with pvc.
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Instead both systems typically expel exhaust through a pipe that runs outside through an exterior wall.
Direct venting or side wall vent chimney and flue systems are a method of venting the exhaust gases from a heating appliance directly out through the side wall of a building while eliminating the need for a vertical chimney of any sort.
They do make two models of power vent units one is called a direct vent power vent as bob harper pointed out it draws its combustion air from outside unlike a standard power vent unit which burns its combustion air from the dwelling.
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The difference is that a power vent water heater pulls in combustion air from the space.
This water heater is found in different homes.
Gas or oil fired side wall power vents are provided by several manufacturers listed at the end of this article.