CUSIP No. 942749 10 2 13G Page 1 of 15 UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 --------------- SCHEDULE 13G (Rule 13d-102) INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT TO RULES 13d-1(b), (c), AND (d) AND AMENDMENTS THERETO FILED PURSUANT TO 13d-2 (Amendment No. 21)* WATTS WATER TECHNOLOGIES, INC. ------------------------------ (Name of Issuer) Class A Common Stock, par value $.10 per share ---------------------------------------------- (Title of Class of Securities) 942749 10 2 ----------- (CUSIP Number) December 31, 2006 ----------------- (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate the rule pursuant to which this Schedule is filed: |_| Rule 13d-1(b) |_| Rule 13d-1(c) |X| Rule 13d-1(d) -------------------------------------------------------------------------------- *The remainder of this cover page shall be filled out for a reporting person's initial filing on this form with respect to the subject class of securities, and for any subsequent amendment containing information which would alter the disclosures provided in a prior cover page. The information required in the remainder of this cover page shall not be deemed to be "filed" for the purpose of Section 18 of the Securities Exchange Act of 1934 ("Act") or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act. CUSIP No. 942749 10 2 13G Page 2 of 15 ________________________________________________________________________________ 1. NAME OF REPORTING PERSONS I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY) Timothy P. Horne ________________________________________________________________________________ 2. CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (a) [_] (b) [_] ________________________________________________________________________________ 3. SEC USE ONLY ________________________________________________________________________________ 4. CITIZENSHIP OR PLACE OF ORGANIZATION United States ________________________________________________________________________________ NUMBER OF 5. SOLE VOTING POWER SHARES 7,229,962 _________________________________________________________________ BENEFICIALLY 6. SHARED VOTING POWER OWNED BY None _________________________________________________________________ EACH 7. SOLE DISPOSITIVE POWER REPORTING 3,572,826 _________________________________________________________________ PERSON 8. SHARED DISPOSITIVE POWER WITH 2,421,680 ________________________________________________________________________________ 9. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 7,229,962 ________________________________________________________________________________ 10. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* [_] ________________________________________________________________________________ 11. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 18.8% ________________________________________________________________________________ 12. TYPE OF REPORTING PERSON* IN CUSIP No. 942749 10 2 13G Page 3 of 15 ________________________________________________________________________________ 1. NAME OF REPORTING PERSONS I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY) George B. Horne ________________________________________________________________________________ 2. CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (a) [_] (b) [_] ________________________________________________________________________________ 3. SEC USE ONLY ________________________________________________________________________________ 4. CITIZENSHIP OR PLACE OF ORGANIZATION United States ________________________________________________________________________________ NUMBER OF 5. SOLE VOTING POWER SHARES None _________________________________________________________________ BENEFICIALLY 6. SHARED VOTING POWER OWNED BY None _________________________________________________________________ EACH 7. SOLE DISPOSITIVE POWER REPORTING None _________________________________________________________________ PERSON 8. SHARED DISPOSITIVE POWER WITH None ________________________________________________________________________________ 9. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON None ________________________________________________________________________________ 10. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* [_] ________________________________________________________________________________ 11. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 0% ________________________________________________________________________________ 12. TYPE OF REPORTING PERSON* IN CUSIP No. 942749 10 2 13G Page 4 of 15 STATEMENT ON SCHEDULE 13G Item 1(a). Name of Issuer. Watts Water Technologies, Inc. Item 1(b). Address of Issuer's Principal Executive Offices. 815 Chestnut Street North Andover, MA 01845 Item 2(a). Names of Persons Filing. Timothy P. Horne George B. Horne Item 2(b). Address of Principal Business Office or, if None, Residence. c/o Watts Water Technologies, Inc. 815 Chestnut Street North Andover, MA 01845 Item 2(c). Citizenship. United States Item 2(d). Title of Class of Securities. Class A Common Stock, par value $.10 per share CUSIP No. 942749 10 2 13G Page 5 of 15 Item 2(e). CUSIP Number. 942749 10 2 Item 3. If This Statement is Filed Pursuant to Rule 13d-1(b), or 13d-2(b) or (c), Check Whether the Person Filing is a: (a) |_| Broker or dealer registered under Section 15 of the Exchange Act. (b) |_| Bank as defined in Section 3(a)(6) of the Exchange Act. (c) |_| Insurance company as defined in Section 3(a)(19) of the Exchange Act. (d) |_| Investment company registered under Section 8 of the Investment Company Act. (e) |_| An investment adviser in accordance with Rule 13d-1(b)(1)(ii)(E); (f) |_| An employee benefit plan or endowment fund in accordance with Rule 13d-1(b)(1)(ii)(F); (g) |_| A parent holding company or control person in accordance with Rule 13d- 1(b)(1)(ii)(G); (h) |_| A savings association as defined in Section 3(b) of the Federal Deposit Insurance Act; (i) |_| A church plan that is excluded from the definition of an investment company under Section 3(c)(14) of the Investment Company Act; (j) |_| Group, in accordance with Rule 13d-1(b)(1)(ii)(J). Not Applicable. CUSIP No. 942749 10 2 13G Page 6 of 15 Item 4. Ownership. Timothy P. Horne (a) Amount Beneficially Owned: Timothy P. Horne (for purposes of this particular Item 4, "Mr. Horne") is deemed the beneficial owner of 7,229,962 shares of Class A Common Stock of the Issuer. As noted below, a substantial portion of Mr. Horne's beneficial ownership of Class A Common Stock is derived from beneficial ownership of Class B Common Stock, par value $.10 per share, of the Issuer, which is convertible into Class A Common Stock on a share-for-share basis. Includes (i) 1,601,220 shares of Class B Common Stock and 1,112 shares of Class A Common Stock held by Mr. Horne, (ii) 1,210,840 shares of Class B Common Stock held by a revocable trust for the benefit of Daniel W. Horne, Mr. Horne's brother, for which Mr. Horne serves as sole trustee, (iii) 1,210,840 shares of Class B Common Stock held by a revocable trust for the benefit of Deborah Horne, Mr. Horne's sister, for which Mr. Horne serves as sole trustee, which trust is revocable with the consent of the trustee, (iv) 1,085,840 shares of Class B Common Stock held by a revocable trust for the benefit of Peter W. Horne, Mr. Horne's brother, for which Peter W. Horne serves as sole trustee, (v) 1,924,600 shares of Class B Common Stock held for the benefit of the estate of George B. Horne, Mr. Horne's late father, under a revocable trust for which Mr. Horne serves as sole trustee, (vi) 22,600 and 20,200 shares of Class B Common Stock held for the benefit of Tiffany Rae Horne (Mr. Horne's daughter) and Tara V. Horne (Mr. Horne's daughter), respectively, under irrevocable trusts for which Mr. Horne serves as trustee, (vii) 147,740 shares of Class B Common Stock held by a revocable trust for the benefit of Tiffany Rae Horne, for which Walter J. Flowers, a partner in the law firm of Flowers and Manning, LLP, serves as trustee, (viii) 3,094 shares of Class A Common Stock issuable upon the exercise of stock options within 60 days after December 31, 2006, and (ix) 1,876 shares of Class A Common Stock issued to Mr. Horne as a restricted stock award under the Watts Water Technologies, Inc. 2004 Stock Incentive Plan, which remain subject to certain restrictions on the transfer and disposition of such shares. All of the shares of Class B Common Stock noted in clauses (i) through (vii) (7,223,880 shares of Class B Common Stock in the aggregate) are subject to The Amended and Restated George B. Horne Voting Trust Agreement - 1997 ("1997 Voting Trust") for which Mr. Horne serves as trustee. (See Exhibit 2 for a description of the 1997 Voting Trust). CUSIP No. 942749 10 2 13G Page 7 of 15 (b) Percent of Class: 18.8% equity percentage 69.3% voting percentage The equity percentage was determined in accordance with Rule 13d-3 under the Securities Exchange Act of 1934, as amended. Due to the fact that each share of Class A Common Stock is entitled to one vote on all matters submitted to stockholders and each share of Class B Common Stock is entitled to ten votes on all matters, equity percentage is not equivalent to voting percentage. (c) Number of shares as to which such person has: (i) sole power to vote or to direct the vote 7,229,962 (ii) shared power to vote or to direct the vote None (iii) sole power to dispose or to direct the disposition of 3,572,826 (iv) shared power to dispose or to direct the disposition of 2,421,680 CUSIP No. 942749 10 2 13G Page 8 of 15 Item 4. Ownership. George B. Horne (a) Amount Beneficially Owned: During 2006, George B. Horne passed away. As a result of his death, he has ceased to be the beneficial owner of shares of Watts Water Technologies, Inc. (b) Percent of Class: 0% (c) Number of shares to which such person has: (i) sole power to vote or to direct the vote None (ii) shared power to vote or to direct the vote None (iii) sole power to dispose or to direct the disposition of None (iv) shared power to dispose or to direct the disposition of None CUSIP No. 942749 10 2 13G Page 9 of 15 Item 5. Ownership of Five Percent or Less of a Class. George B. Horne If this statement is being filed to report the fact that as of the date hereof the reporting person has ceased to be the beneficial owner of more than five percent of the class of securities, check the following |X|. Item 6. Ownership of More than Five Percent on Behalf of Another Person. Timothy P. Horne The estate of George B. Horne has the right to receive and the power to direct the receipt of dividends from, or the proceeds from the sale of, 1,924,600 shares of Class B Common Stock held for the benefit of the estate of George B. Horne under a revocable trust for which Timothy P. Horne serves as sole trustee. Daniel W. Horne has the right to receive and the power to direct the receipt of dividends from, or the proceeds from the sale of, 1,210,840 shares of Class B Common Stock held for the benefit of Daniel W. Horne under a revocable trust for which Timothy P. Horne serves as sole trustee. Deborah Horne has (subject to obtaining the consent of the trustee as described below) the right to receive and the power to direct the receipt of dividends from, or the proceeds from the sale of, 1,210,840 shares of Class B Common Stock held for the benefit of Deborah Horne under a trust for which Timothy P. Horne serves as sole trustee, which trust is revocable with the consent of the trustee. Peter W. Horne has the right to receive and the power to direct the receipt of dividends from, or the proceeds from the sale of, 1,085,840 shares of Class B Common Stock held for the benefit of Peter W. Horne under a revocable trust for which Peter W. Horne serves as sole trustee and which shares are subject to the 1997 Voting Trust. CUSIP No. 942749 10 2 13G Page 10 of 15 Item 7. Identification and Classification of the Subsidiary which Acquired the Security Being Reported on by the Parent Holding Company or Control Person. Not Applicable Item 8. Identification and Classification of members of the Group. Not Applicable Item 9. Notice of Dissolution of Group. As a result of the death of George B. Horne during 2006, the group consisting of Timothy P. Horne and George B. Horne has dissolved. All further filings with respect to the securities reported on in this Schedule 13G will be filed, if required, by Timothy P. Horne individually. Item 10. Certification. Not Applicable CUSIP No. 942749 10 2 13G Page 11 of 15 SIGNATURES After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct. Dated: February 5, 2007 /s/ Timothy P. Horne ------------------------------------------------- TIMOTHY P. HORNE CUSIP No. 942749 10 2 13G Page 12 of 15 INDEX OF EXHIBITS 1. Amended and Restated Stock Restriction Agreement 2. The Amended and Restated George B. Horne Voting Trust Agreement - 1997 CUSIP No. 942749 10 2 13G Page 13 of 15 EXHIBIT 1 All Class B Common Stock shares beneficially owned by Timothy P. Horne are held individually by or in trust for the benefit of Timothy P. Horne, the estate of George B. Horne, Daniel W. Horne, Deborah Horne, Tara V. Horne, Tiffany R. Horne and Peter W. Horne, and any voting trust certificates representing such shares, are subject to an Amended and Restated Stock Restriction Agreement (the "Agreement"). Upon any proposed voluntary transfer or transfer by operation of law of Class B Common Stock or voting trust certificates representing such shares by any of the above stockholders, or upon the death of such a stockholder holding such shares or voting trust certificates, the other parties to the Agreement (other than George B. Horne) have a pro rata right of first refusal to purchase such shares (including a second opportunity to elect to purchase any shares not purchased under the first right of refusal). The purchase price per share is the 15-day average trading price of the Issuer's Class A Common Stock while publicly traded, except in the case of certain involuntary transfers, in which case the purchase price is book value. This summary is qualified in its entirety by reference to the text of the Agreement which is incorporated herein by reference to Exhibit 2 to the Issuer's Current Report on Form 8-K dated October 31, 1991, and to the text of Amendment No. 1 to the Agreement which is incorporated herein by reference to Exhibit 10.21 to the Issuer's Annual Report on Form 10-K dated September 16, 1997. CUSIP No. 942749 10 2 13G Page 14 of 15 EXHIBIT 2 The 1,601,220 shares of Class B Common Stock held by Timothy P. Horne, individually, 1,210,840 shares of Class B Common Stock held by a trust for the benefit of Daniel W. Horne, 1,210,840 shares of Class B Common Stock held by a trust for the benefit of Deborah Horne, 1,924,600 shares of Class B Common Stock held by a trust for the benefit of the estate of George B. Horne, 1,085,840 shares of Class B Common Stock held by a trust for the benefit of Peter W. Horne, 22,600 and 20,200 shares of Class B Common Stock held for the benefit of Tiffany Rae Horne and Tara V. Horne, respectively, under irrevocable trusts for which Mr. Horne serves as trustee, and 147,740 shares of Class B Common Stock held by a trust for the benefit of Tiffany Rae Horne (7,223,880 shares of Class B Common Stock in the aggregate) are subject to the terms of The George B. Horne Voting Trust Agreement-1997 (the "1997 Voting Trust"). Under the terms of the 1997 Voting Trust, the trustee (currently Timothy P. Horne) has sole power to vote all shares subject to the 1997 Voting Trust. Under the terms of the 1997 Voting Trust, in the event Timothy P. Horne ceases to serve as trustee of the 1997 Voting Trust, then Daniel J. Murphy, III, a director of the Issuer, and Walter J. Flowers, a partner in the law firm of Flowers and Manning, LLP (each, a "Successor Trustee" and collectively, the "Successor Trustees"), shall thereupon become co-trustees of the 1997 Voting Trust if such individuals are willing and able to succeed. At any time, Timothy P. Horne, if then living and not subject to incapacity, may designate up to two additional persons, one to be designated as the primary designee (the "Primary Designee") and the other as the secondary designee ("Secondary Designee"), to serve in the stead of any Successor Trustee who shall be unable or unwilling to serve as a trustee of the 1997 Voting Trust. Such designations are revocable by Timothy P. Horne at any time prior to the time at which such designees become a trustee. If any of the Successor Trustees is unable or unwilling or shall otherwise fail to serve as a trustee of the 1997 Voting Trust, or after becoming a co-trustee shall cease to serve as such for any reason, then a third person shall become a co-trustee with the remaining two trustees, in accordance with the following line of succession: first, any individual designated as the Primary Designee, next, any individual designated as the Secondary Designee, and then, an individual appointed by the holders of a majority in interest of the voting trust certificates then outstanding. In the event that the Successor Trustees shall not concur on matters not specifically contemplated by the terms of the 1997 Voting Trust, the vote of a majority of the Successor Trustees shall be determinative. No trustee or Successor Trustee shall possess the Determination Power unless it is specifically conferred upon such trustee pursuant to the provisions of the 1997 Voting Trust. The 1997 Voting Trust expires on August 26, 2021, subject to extension on or after August 26, 2019 by stockholders (including the trustee of any trust stockholder, whether or not such trust is then in existence) who deposited shares of Class B Common Stock in the 1997 Voting Trust and are then living or, in the case of shares in the 1997 Voting Trust the original depositor of which (or the trustee of the original depositor of which) is not then living, the holders of voting trust certificates representing such shares. The 1997 Voting Trust may be amended by vote of the holders of a majority of the voting trust certificates then outstanding and by the number of trustees authorized to take action at the relevant time. Shares may not be removed from the 1997 Voting Trust during its term without the consent of the trustees. CUSIP No. 942749 10 2 13G Page 15 of 15 This summary is qualified in its entirety by reference to the 1997 Voting Trust which is incorporated herein by reference to Exhibit 9.2 of the Issuer's Annual Report on Form 10-K dated September 28, 1999 filed with the Securities and Exchange Commission.