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1. | A O Smith Water Heater BTN 120 THRU 400A Series ManualMODELS BTN 120 THRU 400/A Series 108 COMMERCIAL GAS, GLASS-LINED, TANK-TYPE WATER HEATER INSTALLATION OPERATION MAINTENANCE LIMITED WARRANTY Thank you for buying this energy efficient water heater from A.O. Smith Water Products Company. We appreciate your confidence in our products. CAUTION TEXT PRINTED OR OUT... Brands:A | User Manual | ENGLISH | [View] | ||||||||||