CUSIP No. 942749 10 2

13G

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

o

Rule 13d-1(b)

o

Rule 13d-1(c)

x

Rule 13d-1(d)

CUSIP No. 942749 10 2

13G

1.

Name of Reporting Person
Timothy P. Horne

2.

Check the Appropriate Box if a Member of a Group

(a)

x

(b)

o

3.

SEC Use Only

4.

Citizenship or Place of Organization
United States

Number of
Shares
Beneficially
Owned by
Each
Reporting
Person With

5.

Sole Voting Power
6,329,290

6.

Shared Voting Power
None

7.

Sole Dispositive Power
1,272,600

8.

Shared Dispositive Power
5,056,690

9.

Aggregate Amount Beneficially Owned by Each Reporting Person
6,329,290

10.

Check Box if the Aggregate Amount in Row (9) Excludes Certain Shares  o

11.

Percent of Class Represented by Amount in Row 9
18.5%

12.

Type of Reporting Person
IN

CUSIP No. 942749 10 2

13G

1.

Name of Reporting Person
Daniel W. Horne

2.

Check the Appropriate Box if a Member of a Group

(a)

x

(b)

o

3.

SEC Use Only

4.

Citizenship or Place of Organization
United States

Number of
Shares
Beneficially
Owned by
Each
Reporting
Person With

5.

Sole Voting Power
None

6.

Shared Voting Power
None

7.

Sole Dispositive Power
None

8.

Shared Dispositive Power
1,666,970

9.

Aggregate Amount Beneficially Owned by Each Reporting Person
1,666,970

10.

Check Box if the Aggregate Amount in Row (9) Excludes Certain Shares  o

11.

Percent of Class Represented by Amount in Row 9
5.7%

12.

Type of Reporting Person
IN

CUSIP No. 942749 10 2

13G

1.

Name of Reporting Person
Deborah Horne

2.

Check the Appropriate Box if a Member of a Group

(a)

x

(b)

o

3.

SEC Use Only

4.

Citizenship or Place of Organization
United States

Number of
Shares
Beneficially
Owned by
Each
Reporting
Person With

5.

Sole Voting Power
None

6.

Shared Voting Power
None

7.

Sole Dispositive Power
None

8.

Shared Dispositive Power
1,666,970

9.

Aggregate Amount Beneficially Owned by Each Reporting Person
1,666,970

10.

Check Box if the Aggregate Amount in Row (9) Excludes Certain Shares  o

11.

Percent of Class Represented by Amount in Row 9
5.7%

12.

Type of Reporting Person
IN

CUSIP No. 942749 10 2

13G

1.

Name of Reporting Person
Peter W. Horne

2.

Check the Appropriate Box if a Member of a Group

(a)

x

(b)

o

3.

SEC Use Only

4.

Citizenship or Place of Organization
United States

Number of
Shares
Beneficially
Owned by
Each
Reporting
Person With

5.

Sole Voting Power
85,760

6.

Shared Voting Power
None

7.

Sole Dispositive Power
85,760

8.

Shared Dispositive Power
1,495,010

9.

Aggregate Amount Beneficially Owned by Each Reporting Person
1,580,770

10.

Check Box if the Aggregate Amount in Row (9) Excludes Certain Shares  o

11.

Percent of Class Represented by Amount in Row 9
5.4%

12.

Type of Reporting Person
IN

CUSIP No. 942749 10 2

13G

1.

Name of Reporting Person
Walter J. Flowers

2.

Check the Appropriate Box if a Member of a Group

(a)

x

(b)

o

3.

SEC Use Only

4.

Citizenship or Place of Organization
United States

Number of
Shares
Beneficially
Owned by
Each
Reporting
Person With

5.

Sole Voting Power
None

6.

Shared Voting Power
None

7.

Sole Dispositive Power
None

8.

Shared Dispositive Power
1,894,710

9.

Aggregate Amount Beneficially Owned by Each Reporting Person
1,894,710

10.

Check Box if the Aggregate Amount in Row (9) Excludes Certain Shares  o

11.

Percent of Class Represented by Amount in Row 9
6.4%

12.

Type of Reporting Person
IN

CUSIP No. 942749 10 2

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

Daniel W. Horne

Deborah Horne

Peter W. Horne

Walter J. Flowers

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

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)

o

Broker or dealer registered under Section 15 of the Exchange Act;

(b)

o

Bank as defined in Section 3(a)(6) of the Exchange Act;

(c)

o

Insurance company as defined in Section 3(a)(19) of the Exchange Act;

(d)

o

Investment company registered under Section 8 of the Investment Company Act of 1940;

(e)

o

An investment adviser in accordance with Rule 13d-1(b)(1)(ii)(E);

(f)

o

An employee benefit plan or endowment fund in accordance with Rule 13d-1(b)(1)(ii)(F);

(g)

o

A parent holding company or control person in accordance with Rule 13d- 1(b)(1)(ii)(G);

(h)

o

A savings association as defined in Section 3(b) of the Federal Deposit Insurance Act;

(i)

o

A church plan that is excluded from the definition of an investment company under Section 3(c)(14) of the Investment Company Act;

(j)

o

A non-U.S. institution in accordance with Rule 13d-1(b)(1)(ii)(J);

(k)

o

Group, in accordance with Rule 13d-1(b)(1)(ii)(K). If filing as a non-U.S. institution in accordance with Rule 13d-1(b)(1)(ii)(J), please specify the type of institution:____________________________

Not Applicable.

CUSIP No. 942749 10 2

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Item 4.

Ownership.

Timothy P. Horne

(a)

Amount beneficially owned:   

Timothy P. Horne is deemed the beneficial owner of 6,329,290 shares of Class A Common Stock of the Issuer.  As noted below, all of Timothy P. 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) 1,250,000 shares of Class B Common Stock held by Timothy P. Horne, (ii) 1,666,970 shares of Class B Common Stock held by a revocable trust for the benefit of Daniel W. Horne, Timothy P. Horne’s brother, for which Daniel W. Horne and Walter J. Flowers, a partner in the law firm of Flowers and Manning, LLP, serve as co-trustees, (iii) 1,666,970 shares of Class B Common Stock held by a revocable trust for the benefit of Deborah Horne, Timothy P. Horne’s sister, for which Timothy P. Horne serves as sole trustee, which trust is revocable with the consent of the trustee, (iv) 1,495,010 shares of Class B Common Stock held by a revocable trust for the benefit of Peter W. Horne, Timothy P. Horne’s brother, for which Peter W. Horne serves as sole trustee, (v) 22,600 shares of Class B Common Stock held for the benefit of Tiffany Horne Noonan (Timothy P. Horne’s daughter) under an irrevocable trust for which Timothy P. Horne serves as trustee, (vi) 132,740 shares of Class B Common Stock held by a revocable trust for the benefit of Tiffany Horne Noonan, for which Walter J. Flowers serves as trustee, (vii) 55,000 shares of Class B Common Stock held by a trust for the benefit of Tara V. Horne (Timothy P. Horne’s daughter), for which Walter J. Flowers and Timothy P. Horne serve as co-trustees, and (viii) 40,000 shares of Class B Common Stock held by a trust for the benefit of Tiffany Horne Noonan, for which Walter J. Flowers and Timothy P. Horne serve as co-trustees.  All of the shares of Class B Common Stock noted in clauses (i) through (viii) (6,329,290 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 Timothy P. Horne serves as trustee.  (See Exhibit 2 for a description of the 1997 Voting Trust).

CUSIP No. 942749 10 2

13G

(b)

Percent of class:   

18.5% equity percentage
69.1% 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   

6,329,290

(ii)

Shared power to vote or to direct the vote    

None

(iii)

Sole power to dispose or to direct the disposition of   

1,272,600

(iv)

Shared power to dispose or to direct the disposition of   

5,056,690

CUSIP No. 942749 10 2

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Item 4.

Ownership.

Daniel W. Horne

(a)

Amount beneficially owned:   

Daniel W. Horne is deemed the beneficial owner of 1,666,970 shares of Class A Common Stock of the Issuer.  As noted below, all of Daniel W. 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.

Daniel W. Horne’s beneficial ownership consists of 1,666,970 shares of Class B Common Stock held in a revocable trust for which Daniel W. Horne and Walter J. Flowers serve as co-trustees, all of which are subject to the 1997 Voting Trust for which Timothy P. Horne serves as sole trustee.  (See Exhibit 2 for a description of the 1997 Voting Trust).

(b)

Percent of class:   

5.7% equity percentage
0.0% voting percentage

(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   

1,666,970

CUSIP No. 942749 10 2

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Item 4.

Ownership.

Deborah Horne

(a)

Amount beneficially owned:   

Deborah Horne is deemed the beneficial owner of 1,666,970 shares of Class A Common Stock of the Issuer.  As noted below, all of Deborah 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.

Deborah Horne’s beneficial ownership consists of 1,666,970 shares of Class B Common Stock held in a revocable trust for which Timothy P. Horne serves as the sole trustee, all of which are subject to the 1997 Voting Trust for which Timothy P. Horne serves as sole trustee.  (See Exhibit 2 for a description of the 1997 Voting Trust).

(b)

Percent of class:   

5.7% equity percentage
0.0% voting percentage

(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   

1,666,970

CUSIP No. 942749 10 2

13G

Item 4.

Ownership.

Peter W. Horne

(a)

Amount beneficially owned:   

Peter W. Horne is deemed the beneficial owner of 1,580,770 shares of Class A Common Stock of the Issuer.  As noted below, substantially all of Peter W. 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

Peter W. Horne’s beneficial ownership consists of (i) 1,545,010 shares of Class B Common Stock held in a revocable trust for which Peter W. Horne serves as the sole trustee, and (ii) 35,760 shares of Class A Common Stock.  1,495,010 shares of Class B Common Stock described in clause (i) above are subject to the 1997 Voting Trust for which Timothy P. Horne serves as trustee.  (See Exhibit 2 for a description of the 1997 Voting Trust).

(b)

Percent of class:   

5.4% equity percentage
0.6% voting percentage

(c)

Number of shares to which such person has:

(i)

Sole power to vote or to direct the vote   

85,760

(ii)

Shared power to vote or to direct the vote    

None

(iii)

Sole power to dispose or to direct the disposition of   

85,760

(iv)

Shared power to dispose or to direct the disposition of   

1,495,010

CUSIP No. 942749 10 2

13G

Item 4.

Ownership.

Walter J. Flowers

(a)

Amount beneficially owned:   

Walter J. Flowers is deemed the beneficial owner of 1,894,710 shares of Class A Common Stock of the Issuer.  As noted below, a substantial portion of Mr. Flowers’ 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.

Mr. Flowers’ beneficial ownership consists of (i) 1,666,970 shares of Class B Common Stock held in a revocable trust for the benefit of Daniel W. Horne for which Daniel W. Horne and Mr. Flowers serve as co-trustees, (ii) 132,740 shares of Class B Common Stock held in a revocable trust for the benefit of Tiffany Horne Noonan for which Mr. Flowers serves as the sole trustee, (iii) 55,000 shares of Class B Common Stock held in a trust for the benefit of Tara V. Horne for which Mr. Flowers and Timothy P. Horne serve as co-trustees, and (iv) 40,000 shares of Class B Common Stock held in a trust for the benefit of Tiffany Horne Noonan for which Mr. Flowers and Timothy P. Horne serve as co-trustees. All of the shares of Class B Common Stock noted in clauses (i) through (iv) (1,894,710 in the aggregate) are subject to the 1997 Voting Trust for which Timothy P. Horne serves as sole trustee.  (See Exhibit 2 for a description of the 1997 Voting Trust).   Mr. Flowers disclaims beneficial ownership of all such shares.

(b)

Percent of class:   

6.4% equity percentage
0.0% voting percentage

(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   

1,894,710

CUSIP No. 942749 10 2

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Item 5.

Ownership of Five Percent or Less of a Class.

Not Applicable

Item 6.

Ownership of More than Five Percent on Behalf of Another Person.

Not Applicable

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.

A group has filed this Schedule 13G pursuant to Rule 13d-1(d).  The members of the group are:

Timothy P. Horne

Daniel W. Horne

Deborah Horne

Peter W. Horne

Walter J. Flowers

Item 9.

Notice of Dissolution of Group.

Not Applicable

Item 10.

Certifications.

Not Applicable

CUSIP No. 942749 10 2

13G

/s/ Timothy P. Horne

TIMOTHY P. HORNE

/s/ Timothy P. Horne*

DANIEL W. HORNE

/s/ Timothy P. Horne*

DEBORAH HORNE

/s/ Timothy P. Horne*

PETER W. HORNE

/s/ Walter J. Flowers

WALTER J. FLOWERS

CUSIP No. 942749 10 2

13G