AO Smith Water Heater BTH 400 User Manual
A.O. Smith Water Heater Parts Fulfillment  
125 Southeast Parkway • Franklin, TN 37068  
Phone: 1-800-433-2545 • www.hotwater.com  
“AT A GLANCE” BTH 300/400  
QUICK INSTALLATION TIPS  
Horizontal Sidewall Venting  
Vertical Rooftop Venting  
PRINTED IN U.S.A. 0706  
PART NO. 197062-002  

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