Ownership Submission
FORM 4
Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940
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(Print or Type Responses)
1. Name and Address of Reporting Person *
ROMOSER W DAVID
   2. Issuer Name and Ticker or Trading Symbol
SMITH A O CORP [AOS] 		5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
_____ Director _____ 10% Owner
__X__ Officer (give title below) _____ Other (specify below)
Senior VP, Gen. Counsel & Sec
(Last)
(First)
(Middle)
A. O. SMITH CORPORATION, 11270 WEST PARK PLACE		 3. Date of Earliest Transaction (Month/Day/Year)
01/25/2007
(Street)

MILWAUKEE, WI 53224		 4. If Amendment, Date Original Filed(Month/Day/Year)
 6. Individual or Joint/Group Filing(Check Applicable Line)
_X_ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person
(City)
(State)
(Zip)
Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security
(Instr. 3)		 2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code
(Instr. 8)		 4. Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5)		 5. Amount of Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 3 and 4)		 6. Ownership Form: Direct (D) or Indirect (I)
(Instr. 4)		 7. Nature of Indirect Beneficial Ownership
(Instr. 4)
Code V Amount (A) or (D) Price
Common Stock 01/25/2007   M(1)   2,625 A $ 29.0313 59,162 D  
Common Stock 01/25/2007   M(1)   8,725 A $ 13.563 67,887 D  
Common Stock 01/25/2007   M(1)   8,050 A $ 15.135 75,937 D  
Common Stock 01/25/2007   M(1)   4,675 A $ 26.88 80,612 D  
Common Stock 01/25/2007   M(1)   4,475 A $ 28.7 85,087 D  
Common Stock 01/25/2007   S(2)   200 D $ 38.05 84,887 D  
Common Stock 01/25/2007   S(2)   100 D $ 38.06 84,787 D  
Common Stock 01/25/2007   S(2)   600 D $ 38.07 84,187 D  
Common Stock 01/25/2007   S(2)   2,400 D $ 38.08 81,787 D  
Common Stock 01/25/2007   S(2)   300 D $ 38.09 81,487 D  
Common Stock 01/25/2007   S(2)   2,500 D $ 38.1 78,987 D  
Common Stock 01/25/2007   S(2)   3,100 D $ 38.12 75,887 D  
Common Stock 01/25/2007   S(2)   100 D $ 38.13 75,787 D  
Common Stock 01/25/2007   S(2)   800 D $ 38.14 74,987 D  
Common Stock 01/25/2007   S(2)   5,000 D $ 38.15 69,987 D  
Common Stock 01/25/2007   S(2)   1,800 D $ 38.16 68,187 D  
Common Stock 01/25/2007   S(2)   400 D $ 38.17 67,787 D  
Common Stock 01/25/2007   S(2)   800 D $ 38.18 66,987 D  
Common Stock 01/25/2007   S(2)   300 D $ 38.19 66,687 D  
Common Stock 01/25/2007   S(2)   3,400 D $ 38.2 63,287 D  
Common Stock 01/25/2007   S(2)   800 D $ 38.21 62,487 D  
Common Stock 01/25/2007   S(2)   500 D $ 38.23 61,987 D  
Common Stock 01/25/2007   S(2)   400 D $ 38.231 61,587 D  
Common Stock 01/25/2007   S(2)   100 D $ 38.24 61,487 D  
Common Stock 01/25/2007   S(2)   1,730 D $ 38.25 59,757 D  
Common Stock 01/25/2007   S(2)   870 D $ 38.26 58,887 D  
Common Stock 01/25/2007   S(2)   700 D $ 38.27 58,187 D  
Common Stock 01/25/2007   S(2)   1,100 D $ 38.28 57,087 D  
Common Stock 01/25/2007   S(2)   100 D $ 38.3 56,987 D  
Common Stock 01/25/2007   S(2)   300 D $ 38.31 56,687 D  

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Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security
(Instr. 3)		 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (Month/Day/Year) 3A. Deemed Execution Date, if any (Month/Day/Year) 4. Transaction Code
(Instr. 8)		 5. Number of Derivative Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4, and 5)		 6. Date Exercisable and Expiration Date
(Month/Day/Year)		 7. Title and Amount of Underlying Securities
(Instr. 3 and 4)		 8. Price of Derivative Security
(Instr. 5)		 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 4)		 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I)
(Instr. 4)		 11. Nature of Indirect Beneficial Ownership
(Instr. 4)
Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares
Employee Stock Options (Right to Buy) (3) $ 29.0313 01/25/2007   M(1)     2,625 10/12/2000 10/13/2009 Common Stock 2,625 $ 0 90,958 D  
Employee Stock Options (Right to Buy) (4) $ 13.563 01/25/2007   M(1)     8,725 10/09/2001 10/10/2010 Common Stock 8,725 $ 0 82,233 D  
Employee Stock Options (Right to Buy) (5) $ 15.135 01/25/2007   M(1)     8,050 10/08/2002 10/09/2011 Common Stock 8,050 $ 0 74,183 D  
Employee Stock Options (Right to Buy) (6) $ 26.88 01/25/2007   M(1)     4,675 10/10/2003 10/11/2012 Common Stock 4,675 $ 0 69,508 D  
Employee Stock Options (Right to Buy) (7) $ 28.7 01/25/2007   M(1)     4,475 10/06/2004 10/07/2013 Common Stock 4,475 $ 0 65,033 D  

Reporting Owners

Reporting Owner Name / Address Relationships
 Director  10% Owner  Officer  Other
ROMOSER W DAVID
A. O. SMITH CORPORATION
11270 WEST PARK PLACE
MILWAUKEE, WI 53224		       Senior VP, Gen. Counsel & Sec  

Signatures

 W. David Romoser   01/29/2007
**Signature of Reporting Person Date

Explanation of Responses:

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1) The exercises reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on October 10, 2006.
(2) The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on October 10, 2006.
(3) Granted on October 13, 1999, under the A. O. Smith Corporation Long-Term Executive Incentive Compensation Plan, a Rule 16b-3 Plan.
(4) Granted on October 10, 2000, under the A. O. Smith Corporation Long-Term Executive Incentive Compensation Plan, a Rule 16b-3 Plan.
(5) Granted on October 9, 2001, under the A. O. Smith Corporation Long-Term Executive Incentive Compensation Plan, a Rule 16b-3 Plan.
(6) Granted on October 11, 2002, under the A. O. Smith Combined Executive Incentive Compensation Plan, a Rule 16b-3 Plan.
(7) Granted on October 7, 2003, under the A. O. Smith Combined Executive Incentive Compensation Plan, a Rule 16b-3 Plan.

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