U.S. SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                    FORM 8-K

                     PURSUANT TO SECTION 13 OR 15(d) OF THE
                         SECURITIES EXCHANGE ACT OF 1934


Date of Report (Date of earliest event reported)           March 29, 2005
                                                  ------------------------------


                              THERMODYNETICS, INC.
- --------------------------------------------------------------------------------
             (Exact name of registrant as specified in its charter)

      Delaware                       0-10707                    06-1042505
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[State or other jurisdiction    (Commission File No.)     (I.R.S. Employer
 of incorporation)                                          Identification No.)

      651 Day Hill Road, Windsor, Connecticut                 06095
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     (Address of principal executive offices)             (Zip Code)



                                  860-683-2005
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                         (Registrant's telephone number)


                                      N/A
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         (Former name or former address, if changed since last report.)

Check  the  appropriate  box  below  if the  Form  8-K  filing  is  intended  to
simultaneously  satisfy the filing obligation of the registrant under any of the
following provisions (see General Instruction A.2):

[_]  Written  communications  pursuant to Rule 425 under the  Securities Act (17
     CFR 230.425)

[_]  Soliciting  material pursuant to Rule 14a-12 under the Exchange Act (17 CFR
     240.14a-12)

[_]  Pre-commencement   communications  pursuant  to  Rule  14d-2(b)  under  the
     Exchange Act (17 CFR 240.14d-2(b))

[_]  Pre-commencement   communications  pursuant  to  Rule  13e-4(c)  under  the
     Exchange Act (17 CFR 240.13e-4(c))







Item 3.03.  Material Modification to Rights of Security Holders.

On  March  29,  2005  the  amendment  to the  certificate  of  incorporation  of
Thermodynetics, Inc. (the "Company"), in the form which had been attached to the
November  9, 2004 proxy  statement,  was filed with the  Delaware  Secretary  of
State.  The Board of Directors  approved the  implementation  of a reverse stock
split,  whereby,  with a record date of April 15, 2005 and  effective  9:30 a.m.
April 18, 2005, each  outstanding five shares of the Company's common stock will
be exchanged for one share of common  stock.  No rights of the holders of common
stock will be affected in any other manner.  The stockholders of the Company had
previously  granted  authority  to the Board of Directors to approve and set the
date for a reverse stock split at the 2004 Annual Meeting of  Stockholders  held
November  9, 2004.  A copy of the press  release  announcing  the  approval  and
implementation  of the reverse  stock split is attached as Exhibit  99.1 to this
report.

Item 9.01.  Financial Statements and Exhibits.

(c)  Exhibits
     --------


The exhibits listed below are being furnished with this Form 8-K:



Exhibit Number                      Description
- --------------                      -----------
3.1:                                Amendment to Certificate of Incorporation,
                                    incorporated by reference to Exhibit A of
                                    November 9, 2004 proxy statement
                                   (File No. 2-71500).
99.1:                               Press Release dated April 4, 2005.














                                   SIGNATURES






         Pursuant to the  requirements  of the Securities  Exchange Act of 1934,
the  registrant  has duly  caused  this report to be signed on its behalf by the
undersigned, hereunto duly authorized.


(Registrant)
THERMODYNETICS, INC.



By:  /s/ Robert A. Lerman
   ------------------------------
      Robert A. Lerman, President

Date: April 4, 2005