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)                July 5, 2005
                                                  ------------------------------

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

                                    0-10707


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

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


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

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


Check the appropriate  box 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. below):

     o Written communications  pursuant to Rule 425 under the Securities Act (17
       CFR 230.425)

     o Soliciting  material  pursuant to Rule 14a-12 under the Exchange Act (17
       CFR 240, 14a-12)

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

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






- --------------------------------------------------------------------------------
Section 2.  Financial Information

Item 2.04.  Triggering  Events That  Accelerate  or Increase a Direct  Financial
Obligation or an Obligation under an Off-Balance Sheet Arrangement.

            On August 4, 2003, Thermodynetics, Inc. (the "Company") acquired all
of  the  issued  and  outstanding  capital  stock  of  Vulcan  Industries,  Inc.
("Vulcan").  The Company  financed the acquisition  through,  among other credit
facilities,  a $700,000 term note from its primary bank ("Bank"), and is secured
by  substantially  all of the assets of Vulcan and the Company and is guaranteed
by the  Company and its other  operating  subsidiary.  Further,  a term loan was
obtained from an equipment  finance  company  ("Equipment  Lender") to finance a
portion of new equipment (the  "Equipment  Term Loan").  The Equipment Term Loan
consists of a $1,847,580  term note due March 31, 2009,  and has a first secured
position  specific  equipment  of  Vulcan.  The  Company  is a  co-borrower  for
additional credit and security to such finance company.

         Further, a community block development term loan (the "City Term Loan")
was obtained September 12, 2003 from the City of Sturgis, Michigan ("City"). The
City Term Loan is a $400,000  term note  amortized  over the same  period as the
Equipment  Term Loan,  is secured by a  subordinated  position  in the assets of
Vulcan and the new equipment  purchased by Vulcan. The Company is a guarantor of
such loan.

         On July 5, 2005,  the Company  and Vulcan  received a notice of default
dated July 1, 2005 from Equipment Lender.  Equipment Lender stated its intention
to  accelerate  the entire unpaid  balance of the Equipment  Term Loan unless it
received a payment of $79,453.90 by July 10, 2005; such lender extended the cure
date  through  July 15,  2005.  The  Company is unable to pay such amount to the
Equipment Lender without selling the equipment financed by such loan.

         On July 6,  2005,  the  Company,  Vulcan and the  Company's  subsidiary
Turbotec  Products,  Inc.  received  a notice  dated  July 6, 2005 from the Bank
stating that Events of Default have  occurred and are  continuing  in respect of
the Bank's Term Loan as a result of, among other reasons,  the  acceleration  of
the  Equipment  Term Loan.  The Company has not yet received a notice of default
from the City; however, if the alleged Equipment Term Loan default is not cured,
the Company anticipates receiving a default notice from the City.

         In  anticipation  of the alleged  loan  defaults,  the Company has been
seeking  to sell  certain of the  equipment  owned by Vulcan.  The  Company  has
entered into a nonbinding  letter agreement with the Bank, the Equipment Lender,
the  City,  and one  customer  of  Vulcan  to sell the  equipment  securing  the
Equipment  Term Loan and some  additional  equipment to such customer of Vulcan;
such customer  accounts for  approximately 80% of Vulcan's sales, and 28% of the
Company's  sales.  The  anticipated  sale  will  be  sufficient  to pay  off the
Equipment  Term Loan in full and  approximately  one-half of the City Term Loan.
The Bank has indicated in such  nonbinding  letter that it would permit the sale
of such equipment to proceed.  Separately,  the Bank has verbally  indicated its
intention  to  forbear   accelerating  its  credit  facilities  and  to  provide
additional  term  debt to pay the  remaining  approximate  one-half  outstanding
balance of the City Term Loan if the other  parties agree to the terms set forth


                                       2


in the nonbinding letter agreement.  Such  transactions,  if consummated,  would
severely reduce Vulcan's  manufacturing capacity and revenues, but also remove a
significant amount of debt from the Company's balance sheet, which debt has been
accelerated. Further, the nonbinding letter agreement provides that the customer
may agree to fund certain  operations of Vulcan  through  August 15, 2005; if it
does  not do so,  it may  cause  Vulcan  to  cease  operations.  Therefore,  the
long-term viability of Vulcan is highly uncertain.

         The Company is  currently  unable to state the effect on its  financial
condition of such events, although they are likely to be material.





                                       3



Section 9.  Financial Statements and Exhibits

Item 9.01.  Financial Statements and Exhibits.

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

              Exhibit No.            Description
              -----------            -----------


            10.1    $700,000  Term Note  dated as of July 31,  2003 to  Citizens
                    Bank  of  Massachusetts.  (Incorporated  by  reference  from
                    Exhibit 10-a to Form 8-K filed  August 14, 2003,  Commission
                    File No. 0-10707).

            10.2.   $1,750,000  Term  Note  dated as of July  25,  2003 to Wells
                    Fargo Equipment  Finance,  Inc.  (Incorporated  by reference
                    from  Exhibit  10-d to  Form  8-K  filed  August  14,  2003,
                    Commission File No. 0-10707).






                                   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 hereto duly authorized.

 (Registrant)
THERMODYNETICS, INC.



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

Date: July 11, 2005




                                       4