EXHIBIT (10)(i)

                                SECURED TERM NOTE


$700,000.00                                                     January 23, 2002
                                                           Boston, Massachusetts

      For value received, the undersigned promises to pay to Citizens Bank of
Massachusetts ("Bank"), or order, at Bank, the principal sum of Seven Hundred
Thousand ($700,000.00) Dollars in sixty (60) installments, as follows:
$11,667.00 on February 1, 2002, and the same amount (except the last installment
which shall be the unpaid balance) on the first day of each month thereafter
until this note is fully paid, with interest from the date hereof on the said
principal sum from time to time outstanding at the Prime Rate for commercial
loans from time to time in effect at the Bank. Such interest shall be payable
monthly in arrears on the first day of each month, commencing on the first of
such dates next succeeding the date hereof. The term "Prime Rate" as used herein
shall mean the rate of interest announced by Bank from time to time at its head
office as its Prime Rate, it being understood that such rate is a reference rate
and not necessarily the lowest rate of interest charged by the Bank. Interest
shall be calculated on the basis of actual days elapsed and a 360 day year.

      At the option of the holder, this note shall become immediately due and
payable without notice or demand upon the occurrence at any time of any of the
following events of default: (1) the failure by the undersigned to pay when due
any principal, interest, fees, costs and expenses due to the holder hereunder or
otherwise; (2) if any statement, representation or warranty made in or in
connection with the loan evidenced by this note, or in any supporting financial
statement of the undersigned or of any guarantor hereof shall be found to have
been false in any material respect;(3) the institution by or against the
undersigned or any guarantor hereof of any proceedings pursuant to Title 11 of
the United States Code entitled "Bankruptcy" (commonly referred to as the
Bankruptcy Code) or any other law in which the undersigned or any guarantor
hereof is alleged to be insolvent or unable to pay their respective debts as
they mature or the making by the undersigned or any guarantor hereof of an
assignment for the benefit of creditors; (4) the service upon the holder hereof
of a writ in which the holder is named as trustee of the undersigned or of any
guarantor hereof; or (5) termination for any reason of the Amended and Restated
Loan and Security Agreement (Accounts Receivable and Inventory) dated October
31, 1994, as amended, between the Bank and Turbotec Products, Inc. (the
"Agreement").

      This note may be prepaid in whole or in part at any time and from time to
time without penalty or premium, provided that any such prepayment shall be
applied to the installments due hereunder in the inverse order of their
maturity.

      Any deposits or other sums at any time credited by or due from the Bank to
the undersigned or any guarantor hereof, and any securities or other property of
the undersigned or any such guarantor, in the possession of the Bank, may at any
and all times be held and treated as security for the payment of the liabilities
hereunder; and the Bank may apply or set off such deposits or other sums, at any
time, and without notice to the undersigned or to any such guarantor, against
any of such liabilities, whether or not the same have matured, and whether or
not other collateral is available to the Bank.

      The undersigned agrees to pay all costs of collection including reasonable
fees of attorneys.

      No delay or omission on the part of the holder in exercising any right
hereunder shall operate as a waiver of such right or of any other right of such
holder, nor shall any delay, omission or waiver on any one occasion be deemed a
bar to or waiver of the same or any other right on any future occasion. Every
one of the undersigned and every indorser or guarantor of this note regardless
of the time, order or place of signing waives presentment, demand, protest and
notices of every kind and assents to any one or more extensions or postponements
of the time of payment or any other indulgences, to any substitutions, exchanges
or releases of collateral if at any time there be available to the holder
collateral for this note, and to the additions or releases of any other parties
or persons primarily or secondarily liable.


<PAGE>


      This note is secured pursuant to the terms of an Open End Mortgage Deed of
even date herewith on property located at 651 Day Hill Road, Windsor,
Connecticut, and a Security Agreement - Inventory, Accounts, Equipment and Other
Property dated September 4, 1992.

      All rights and obligations hereunder shall be governed by the law of the
Commonwealth of Massachusetts and this note shall be deemed to be under seal.

Witness:                                   THERMODYNETICS, INC.


                                           By:   /s/  Robert I. Lieberman
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                                              Robert I. Lieberman, Treasurer