EXHIBIT 32.1 CERTIFICATION PURSUANT TO SECTION 1350, CHAPTER 63 OF TITLE 18, UNITED STATES CODE, AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 Pursuant to Section 1350, Chapter 63 of Title 18, United States Code, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, the undersigned, as President and Chief Executive Officer of BTU International, Inc. (the "Company"), does hereby certify that to his knowledge: 1) the Company's Quarterly Report on Form 10-Q for the quarterly period ended October 3, 2004 (the "Report") fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and 2) the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company for the periods covered by the Report. /s/ Paul van der Wansem ----------------------- Paul van der Wansem President, Chief Executive Officer and Chairman of the Board Dated: November 17, 2004