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1. | A O Smith Water Heater ARGSS02306 ManualResidential Gas Water Heaters DIRECT-VENT SURE SHOT FEATURES DIRECT-VENT DESIGN One-pipe, dual-channel closed-combustion system draws all make-up air from outside the home, eliminating problems caused by insufficient indoor ventilation. Horizontal air intake and venting on most models up to 4 feet from outside wall, with no electrical power needed. 6-YEAR LIMITED TANK & PARTS WARRANTY For complete information, consult written warranty or A. O. Smith Water Products Company. A. O. ... Brands:A | User Manual | ENGLISH | [View] | ||||||||||