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 18, 2005
                                                  ------------------------------

                              THERMODYNETICS, INC.
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             (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.)
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   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 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))


Thermodynetics. Inc.                 Page 2

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Item 1.01.  Entry into a Material Definitive Agreement.

         On July 11, 2005,  Thermodynetics,  Inc. (the "Company") filed a report
on Form 8-K under Item 2.04,  "Triggering  Events That  Accelerate or Increase a
Direct  Financial  Obligation  or  an  Obligation  under  an  Off-Balance  Sheet
Arrangement,"  (the  "July  11th  8-K")  regarding  Vulcan  Industries,   Inc.'s
("Vulcan")  receipt of a notice of default dated July 1, 2005 from its equipment
finance  company (the  "Equipment  Lender") of a $1,847,580  equipment term loan
(the "Equipment Term Loan"). The Form 8-K also reported that the Company, Vulcan
and another subsidiary, Turbotec Products, Inc., received a notice dated July 6,
2005 from its primary bank (the "Bank") stating that the $700,000 term loan from
the Bank (the "Bank Term  Loan") was in default.  Such Form 8-K is  incorporated
herein by reference.

         Consequently the Company,  Vulcan,  the Bank, the Equipment Lender, the
City of Sturgis ("City") and Vulcan's major customer  ("Customer")  entered into
an  Accommodation  Agreement  consummated  July  18,  2005  (the  "Accommodation
Agreement") as summarized below:

   o All  equipment  financed  by the  Equipment  Lender  was  purchased  by the
     Customer by payment of 100% of the  Company's  obligation  to the Equipment
     Lender,  and $175,000 of the Company's  obligation to the City. The Company
     paid the remaining $187,000 due to the City.
   o The  Company  and  Vulcan   received   full  releases  from  all  financial
     obligations owed to such lenders.
   o The  Customer  also  acquired  certain  other  assets  from  Vulcan  for no
     additional  consideration  and the Bank released such other  equipment from
     its lien.
   o The Customer  waived certain offsets it may have against amounts due Vulcan
     until such time as Vulcan's obligations to the Bank are satisfied in full.
   o The Customer has purchased certain inventory from Vulcan.
   o Vulcan has agreed to continue to produce certain products for the Customer,
     provided  the Customer  funds such  production  pursuant to weekly  budgets
     agreed to by Customer.
   o The Company  owes the  Customer  $175,000 for  operating  advances  made in
     January, 2005.
   o At its option, the Customer may sublease Vulcan's facility and equipment at
     the same amount  Vulcan pays to its  landlord,  plus an amount to be agreed
     upon for the use of any remaining equipment owned by Vulcan.  Further,  the
     Customer was granted an exercisable right,  upon a default by Vulcan,  an
     exercisable  right to occupy and use  Vulcan's  facility  and  equipment to
     manufacture  parts  for  itself,  including  the  right to  lease  Vulcan's
     employees; the Customer would then be obligated to reimburse Vulcan for all
     costs related to the employees and all overhead  facility costs  associated
     with the production of its parts.
   o The  Accommodation  Agreement also provided  releases  between the Customer
     Vulcan and the Company.


Thermodynetics. Inc.                 Page 3


         The  Accommodation  Agreement  severely reduces Vulcan's  manufacturing
capacity and revenues,  but also removes a  significant  amount of debt from the
Company's  balance  sheet.  Further,  if the  Customer  does  not  fund  certain
operations  of Vulcan it may cause Vulcan to cease  operations as the ability of
Vulcan to operate afterwards may not be economically  feasible.  Therefore,  the
long-term viability of Vulcan is highly uncertain.

Item 2.01.  Completion of Acquisition or Disposition of Assets.

         The information  provided in Item 1.01 of this Form 8-K is incorporated
herein in its entirety.

Item 8.01.  Other Events.

           In a press release dated  May 23, 2005  which was filed as an exhibit
to Form 8-K filed May 24, 2005,  the Company stated that it expected "to achieve
new record  level of sales and  operating  results"  in  fiscal-year  2006;  the
company no longer  anticipates  achieving  record  levels of sales and operating
results in fiscal-year 2006.

Item 9.01.  Financial Statements and Exhibits

         (c) Exhibits.
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                Exhibit No.                      Description
                -----------                      -----------

                10.1.    Accommodation  Agreement by and among Customer,  Vulcan
                         Industries, Inc., Thermodynetics, Inc., Bank, Equipment
                         Lender and the City of Sturgis, Michigan dated July 15,
                         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 hereto duly authorized.

(Registrant)
THERMODYNETICS, INC.



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


Date: July 21, 2005

TDYT 8-K 2005 (TDYT 8-K Accom 07-20-05 (2))