Up to 96% thermal efficiency,direct vent – A.O. Smith BTH-120 through BTH-500 User Manual

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Up to 96% thermal efficiency,direct vent | A.O. Smith BTH-120 through BTH-500 User Manual | Page 2 / 4 Up to 96% thermal efficiency,direct vent | A.O. Smith BTH-120 through BTH-500 User Manual | Page 2 / 4
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