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1. | A O Smith Water Heater BTH 120 through BTH 500 ManualUP TO 96% THERMAL EFFICIENCY,DIRECT VENT The A.O. Smith Cyclone Xi family of products represents the industry's most technologically advanced commercial water heaters. The innovative Cyclone Xi design takes performance to its highest level with efficiencies of 95% and 96%. Models are available from 120,000 BTUs and now up to 500,000 BTUs. In addition, the Cyclone Xi features an Intelligent Control System making it the smartest water heater in the industry. Cyclone Xi provides outstanding hot wa... Brands:A | User Manual | ENGLISH | [View] | ||||||||||