Above are our top recommendations for how to contact A.O. Smith, including their top phone number and live chat options. Below you can compare and contrast the 5 ways to contact A.O. Smith by looking at which ones are the fastest and which ones other customers recommend the most for solving A.O. Smith customer service issues as reported to us by the 50 million or so customers that come to GetHuman each year and share their experiences. You can contact A.O. Smith across the following mediums: Phone, Web.