sealed combustion hot water heater tank type

Greetings, anyone have a sealed combustion natural gas hot water heater that can vent from the first floor vertically through a second floor roof? One that does not require a powered blower to do so? One with a tank, not a tankless one?
I see several sealed combustion units when doing a web search but these seem to need to vent horizontally (and must vent a very short distance immediately adjacent the unit).
Thanks for any input.
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