I choose that water heater after talking to a number of friends, one who installs solar hot water systems and another that heads up the low income energy efficient retrofits that I've mentioned on here before and both of them right away said that the A.O Smith Vertex water heater was the way to go and I never really found a good 2nd choice.
The friend who installs solar hot water systems looks to install a handful of these water heaters per year, I installed mine my self and found it to be really straight forward.
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