Toyostove and Oil Miser both make them.
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.
When you cannot use B vent to find a way to vent the HWT through to the roof!
yes there are direct vent gas water heater available Absolutely NOT
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No. Gas water heaters are not all designed to use direct venting.
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.
heater vent will not readjust to any position
No, an electric water heater does not require a vent for proper operation.
My direct vent furnace pilot light issue was the glass viewing port was missingallowing room air to blow out the pilot light. Replacing the missing glass which stopped the draft, fixed the problem.
YES
Depends on what type of vent system water heater has.