A.O. Smith's highest-rated Legend(r) Boilers (90 percent thermal efficiency) and Genesis(r) Boilers (84 percent thermal efficiency) provide inputs up to 2.5 million Btu, small footprints, and advanced features for ease of installation and venting versatility. All Legend and Genesis hydronic boilers deliver low NOx emissions, and are covered by a 10-year warranty. A.O. Smith's Dia-Scan(tm) II self-diagnostic system provides "24/7" LED display of system status and temperature, along with push-button adjustment of temperature and other program settings.

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