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                                                                   EXHIBIT 32.1

                            CERTIFICATION PURSUANT TO
                             18 U.S.C. SECTION 1350,
                             AS ADOPTED PURSUANT TO
                  SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

         The undersigned officer of Watts Water Technologies, Inc. (the
"Company") hereby certifies that the Company's quarterly report on Form 10-K to
which this certification is attached (the "Report"), as filed with the
Securities and Exchange Commission on the date hereof, fully complies with the
requirements of Section 13(a) or 15(d), as applicable, of the Securities
Exchange Act of 1934, as amended (the "Exchange Act"), and that the information
contained in the Report fairly presents, in all material respects, the financial
condition and results of operations of the Company. This certification is
provided solely pursuant to 18 U.S.C. Section 1350 and Item 601(b)(32) of
Regulation S-K ("Item 601(b)(32)") promulgated under the Securities Act of 1933,
as amended (the "Securities Act"), and the Exchange Act. In accordance with
clause (ii) of Item 601(b)(32), this certification (A) shall not be deemed
"filed" for purposes of Section 18 of the Exchange Act, or otherwise subject to
the liability of that section, and (B) shall not be deemed to be incorporated by
reference into any filing under the Securities Act or the Exchange Act, except
to the extent that the Company specifically incorporates it by reference.

Date: March 12, 2004                              /s/ Patrick S. O'Keefe
                                                  -----------------------
                                                  Patrick S. O'Keefe
                                                  Chief Executive Officer