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1. | A O Smith Water Heater BTH 300A Manual CYCLONE XHE Model BTH 300A AND 400A Series 970 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 explo... Brands:A | User Manual | ENGLISH | [View] | ||||||||||