EXHIBIT 31.1

                                  CERTIFICATION
   pursuant to Rules 13a-15 and 15d-15 of the Securities Exchange Act of 1934

I, Robert A. Lerman, Chief Executive Officer of Thermodynetics, Inc., certify
that:

1. I have reviewed this quarterly report on Form 10-QSB of Thermodynetics, Inc.;

2. Based on my knowledge, this quarterly report does not contain any untrue
statement of a material fact or omit to state a material fact necessary to make
the statements made, in light of the circumstances under which such statements
were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial
information included in this quarterly report, fairly present in all material
respects the financial condition, results of operations and cash flows of the
small business issuer as of, and for, the periods presented in this report;

4. The small business issuer's other certifying officers and I are responsible
for establishing and maintaining disclosure controls and procedures (as defined
in Exchange Act Rules 13a-15(e) and 15d-15(e)) for the small business issuer and
have:

     a) designed such disclosure controls and procedures, or caused such
     disclosure controls and procedures to be designed under our supervision, to
     ensure that material information relating to the small business issuer,
     including its consolidated subsidiaries, is made known to us by others
     within those entities, particularly during the period in which this report
     is being prepared;

     b) evaluated the overall effectiveness of the small business issuer's
     disclosure controls and procedures and presented in this report our
     conclusions about the effectiveness of the disclosure controls and
     procedures, as of the end of the period covered by this report based on
     such evaluation; and

     c) disclosed in this report any change in the small business issuer's
     internal control over financial reporting that occurred during the small
     business issuer's most recent fiscal quarter (the small business issuer's
     fourth fiscal quarter in the case of an annual report) that has materially
     affected, or is reasonably likely to materially affect, the small business
     issuer's internal control over financial reporting;

5. The small business issuer's other certifying officers and I have disclosed,
based on our knowledge and our most recent evaluation of internal control over
financial reporting, to the small business issuer's auditors and the small
business issuer's board of directors:

     a) all significant deficiencies and material weaknesses in the design or
     operation of internal control over financial reporting which are reasonably
     likely to adversely affect the small business issuer's ability to record,
     process, summarize and report financial information; and

     b) any fraud, whether or not material, that involves management or other
     employees who have a significant role in the small business issuer's
     internal control over financial reporting; and


     Date: August 14, 2003             By: /s/ Robert A. Lerman
                                           -------------------------------------
                                           Robert A. Lerman
                                           President and Chief Executive Officer