A. O. Smith's ProMax® is an energy-efficient residential water heater designed for households, providing long-lasting value and exceptional performance, says the company.

Effex® from A. O. Smith is the most efficient and advanced conventional vent product on the market, says the company. The patented air intake system turbocharges the combustion process to produce the highest efficiency available for a standard atmospheric product.

Source: Air-Conditioning, Heating, and Refrigeration Institute (AHRI). Industry figures are estimates that are derived from the best available figures supplied by a sample of AHRI member companies.