On Mar 16, 8:27 pm, Don Wiss wrote:
I'd like to switch to a direct vent water heater. Looking at the A.O. Smith
site I get confused with all the models. Efficiency information is hidden.
There is no convenient chart to distinguish the models. It would seem that
these are my choice:

ProMax Closed Combustion Power Direct-Vent
ProMax Power Vent (C3 FVIR)
Power House Sealed Shot Power Direct-Vent
Power House Power Shot Power-Vent

But I can't figure out what is different. Plus each of the above has
variants.

So, what is the most efficient 50 gallon tank water heater with the longest
tank warranty? The run would be about 40 feet and will have a bunch of 90
degree bends.

Don www.donwiss.com (e-mail link at home page bottom)

Take a look at Voyager water heaters similar to the AO Smith Cyclone.
They (Voyager) have stainless heat exchangers. It's the recovery rate
and efficiencies that you want to pay attention too.