FORM 3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 INITIAL STATEMENT OF 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 *   Heideman Robert J 2. Date of Event Requiring Statement (Month/Day/Year) 12/14/2010 3. Issuer Name and Ticker or Trading Symbol SMITH A O CORP [AOS] (Last) (First) (Middle) A. O. SMITH CORPORATE TECHNOLOGY CENTER, 12100 WEST PARK PLACE 4. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner __X__ Officer (give title below) _____ Other (specify below) Senior Vice President Corp Tec 5. If Amendment, Date Original Filed(Month/Day/Year) (Street) MILWAUKEE, WI 53224 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 Beneficially Owned

1.Title of Security (Instr. 4) 2. Amount of Securities Beneficially Owned (Instr. 4) 3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5) 4. Nature of Indirect Beneficial Ownership (Instr. 5)

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.			SEC 1473 (7-02)
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Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)

1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Employee Stock Options (Right to Buy)	  (1)	  (1)	Common Stock	6,150	$ 0	D	Â
Restricted Stock Units	  (2)	  (2)	Common Stock	1,950	$ 0	D	Â

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
Heideman Robert J A. O. SMITH CORPORATE TECHNOLOGY CENTER 12100 WEST PARK PLACE MILWAUKEE, WI 53224	Â	Â	  Senior Vice President Corp Tec	Â

Signatures

James F. Stern, Attorney-in-Fact for Robert J. Heideman		12/17/2010
**Signature of Reporting Person		Date

Explanation of Responses:

*	If the form is filed by more than one reporting person, see Instruction 5(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)	1,200 employee stock options were granted on 02/11/2008 under the A. O. Smith Combined Incentive Compensation Plan, a transaction exempt under Rule 16b-3. The options become exercisable in three annual installments of 1/3 of the award starting on 02/11/2009. The options expire on 02/11/2018. 3,300 employee stock options were granted on 02/09/2009 under the A. O. Smith Combined Incentive Compensation Plan, a transaction exempt under Rule 16b-3. The options become exercisable in three annual installments of 1/3 of the award starting on 02/09/2010. The options expire on 02/09/2019. 1,650 employee stock options were granted on 02/08/2010 under the A. O. Smith Combined Incentive Compensation Plan, a transaction exempt under Rule 16b-3. The options become exercisable in three annual installments of 1/3 of the award starting on 02/08/2011. The options expire on 02/08/2020.
(2)	450 restricted stock units were granted on 02/11/2008 under the A. O. Smith Combined Incentive Compensation Plan, a transaction exempt under Ruble 16b-3. The restricted stock units become payable in Common Stock on the vesting date of 02/11/2011. 900 restricted stock units were granted on 02/09/2009 under the A. O. Smith Combined Incentive Compensation Plan, a transaction exempt under Ruble 16b-3. The restricted stock units become payable in Common Stock on the vesting date of 02/09/2012. 600 restricted stock units were granted on 02/08/2010 under the A. O. Smith Combined Incentive Compensation Plan, a transaction exempt under Ruble 16B-3. The restricted stock units become payable in Common Stock on the vesting date of 02/08/2013.

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