AO Smith VertexThe Vertex™, by A. O. Smith, is a residential gas-condensing water heater that combines an advanced internal heat exchanger with 100,000 Btu input resulting in a state-of-the-art water heater with money-saving 96 percent thermal efficiency, the company says. With advanced diagnostic capabilities, the Vertex records performance history and has a backlit LCD display that details model functions including accurate temperature control.

A. O. Smith