A. O. Smith (AOS) 10-Q 2010 Q1 Quarterly report

Exhibit 32

Written Statement of the Chief Executive Officer and the

Chief Financial Officer Pursuant to 18 U.S.C. Section 1350

Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, 18 U.S.C. Section 1350, each of the undersigned certifies that to the best of our knowledge:

(1) the Quarterly Report Form 10-Q of A. O. Smith Corporation for the quarter ended March 31, 2010 (the “Report”) fully complies with the requirements of Section 13(a) or Section 15(d) of the Securities Exchange Act of 1934; and

(2) the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of A. O. Smith Corporation.

May 5, 2010

/s/ Paul W. Jones

Paul W. Jones

Chairman and Chief Executive Officer

/s/ Terry M. Murphy

Terry M. Murphy

Executive Vice President and Chief Financial Officer

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