a direct vent water heater is more fuel efficient (cost's less to operate). aside from that there isn't much difference, aside from not needing a double wall flue through the roof on a standard gas water heater.
yes there are direct vent gas water heater available Absolutely NOT
When you cannot use B vent to find a way to vent the HWT through to the roof!
No. Gas water heaters are not all designed to use direct venting.
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No, directly vents through to outside wall of building.
Installing a direct vent tankless water heater in your home can provide benefits such as energy efficiency, cost savings on utility bills, continuous hot water supply, space savings, and longer lifespan compared to traditional water heaters.
No, an electric water heater does not require a vent for proper operation.
Depends on what type of vent system water heater has.
P.F Edwards has written: 'Direct vent water heater test' -- subject(s): Gas Water heaters, Testing, Water heaters, Gas
The purpose of a water heater vent cap is to safely exhaust combustion gases from the water heater to the outside. It helps prevent the buildup of harmful gases like carbon monoxide inside the home. By ensuring proper ventilation, the vent cap contributes to the efficient and safe operation of the water heater system.
B-vent pipe.