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1. | A O Smith Water Heater 500A Manual CYCLONE Xi Model BTH 300A, 400A, 500A COMMERCIAL GAS WATER HEATER GAS-FIRED POWER BURNER FOR DOMESTIC HOT WATER INSTALLATION OPERATION SERVICE MAINTENANCE LIMITED WARRANTY WARNING: If the information in these instructions is not followed exactly, a fire or explosion may result causing property damage, personal injury or death. Do not store or use gasoline or ... Brands:A | User Manual | ENGLISH | [View] | ||||||||||