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1. | A O Smith Water Heater HWHWB 300 THRU 670 ManualPSD-3-452 COMMERCIAL WATER HEATER REPLACEMENT PARTS LIST MODELS HW/HWB 300 THRU 670 SERIES: 100/101 INTERMITTENT IGNITION CONTROL RADIATION SHIELD 73 74 75 A.O. SMITH WATER PRODUCTS CO., INC. 5621 W. 115TH STREET ALSIP, ILLINOIS 60803 Phone: 1-800-433-2545 Fax: 1-800-433-2515 website: [email protected] PRINTED IN U.S.A. 0303 211829-000 REV. 00 ... Brands:A | User Manual | ENGLISH | [View] | ||||||||||