Exhibit 4.7

      NEITHER THIS WARRANT NOR THE SHARES FOR WHICH IT IS EXERCISABLE HAVE
      BEEN  REGISTERED  UNDER THE  SECURITIES ACT OF 1933, AS AMENDED (THE
      "ACT")  OR  ANY  APPLICABLE   STATE  SECURITIES  LAWS.  NO  SALE  OR
      DISPOSITION OF THIS WARRANT OR OF ANY SUCH SHARES MAY BE EFFECTED IN
      THE ABSENCE OF AN EFFECTIVE  REGISTRATION  STATEMENT RELATED THERETO
      UNDER THE ACT AND ANY  APPLICABLE  STATE  SECURITIES  LAWS UNLESS AN
      EXEMPTION FROM SUCH REGISTRATION  REQUIREMENT IS AVAILABLE UNDER THE
      ACT AND ANY APPLICABLE STATE SECURITIES LAWS.

_________ __, 2004                   WARRANT                               CPS-_

                                   To Purchase

                       Shares of Series C Preferred Stock

                                       of

                          OVATION PRODUCTS CORPORATION

      This Warrant entitles ___________,  a resident of __________ (the "INITIAL
HOLDER"),  or assigns,  to  subscribe  for and purchase  from  OVATION  PRODUCTS
CORPORATION,  a Delaware corporation (the "COMPANY"),  at any time commencing on
the date hereof (the "EFFECTIVE DATE"), and on or before 5:00 P.M., Eastern Time
time,  on the first to occur of (a)  __________  __, 2006 or (b) the date of the
closing of the initial public offering ("IPO") to the public generally of shares
of the Company's Common Stock pursuant to a registration statement under the Act
(the `EXPIRATION  DATE"),  _______ shares of Series C Preferred Stock at a price
of $5.00 per share (the "Purchase Price") on the terms and conditions  contained
herein.

            1. DEFINITIONS. For all purposes of this Warrant the following terms
shall have the following meanings:

            "COMMISSION" shall mean the Securities and Exchange  Commission,  or
any other federal agency then administering the Securities Act.

            "COMPANY"  shall  mean  Ovation  Products  Corporation,  a  Delaware
corporation,  and any corporation which shall succeed to the obligations of said
corporation hereunder.

            "OTHER  SECURITIES"  shall  mean  any  stock  (other  than  Series C
Preferred  Stock)  or  other  securities  of the  Company  or any  other  person
(corporate or otherwise) which the  Warrantholders at any time shall be entitled
to receive, or shall have received,  upon the exercise of the Warrants,  in lieu
of or in  addition to Series C  Preferred  Stock,  or which at any time shall be
issuable or shall have been issued in exchange for or in replacement of Series C
Preferred Stock or Other Securities.

            "REGISTRATION  STATEMENT" shall mean a registration  statement filed
under the Securities Act of 1933.

<PAGE>

            "SECURITIES  ACT" shall mean the Securities Act of 1933, as amended,
and the rules and regulations of the Commission thereunder.

            "SUBSCRIPTION  FORM"  shall  mean  the  subscription  form  attached
hereto.

            "TRANSFER"  shall  mean  any  sale,  assignment,   pledge  or  other
imposition of any Warrants and/or Warrant  Shares,  or of any interest in either
thereof,  which would  constitute a sale thereof within the meaning of Section 2
(3) of the Securities Act.

            "WARRANT  SHARES" shall mean the shares of Series C Preferred  Stock
purchased or purchasable by the Warrantholder  upon the exercise of the Warrants
pursuant to Section 2 hereof.

            "WARRANTHOLDER"  shall  mean the  holder  or  holders  of any of the
Warrants or any related Warrant Shares.

            "WARRANTS" shall mean the Warrants (including this Warrant), of even
date  herewith,  evidencing  the right to purchase  shares of Series C Preferred
Stock and designated by a number preceded by the letters "CPS", and all Warrants
issued in exchange, transfer or replacement thereof.

All terms used in this  Warrant  which are not  defined in Section 1 hereof have
the meanings respectively set forth elsewhere in this Warrant.

            2.  EXERCISE OF WARRANT,  SHARES  ISSUABLE UPON EXERCISE AND PAYMENT
FOR WARRANT SHARES.

            (a) The rights  represented  by this Warrant may be exercised at any
time on or  after  the  Effective  Date  and  from  time to  time  prior  to the
Expiration Date, by the holder of this Warrant,  in whole or in part (but not as
to less than 100 Warrant Shares or as to any fractional  Warrant Share), by: (i)
delivery to the Company of a completed  Subscription Form; (ii) surrender to the
Company of this Warrant;  and (iii) payment for such Warrant  shares as provided
in  Section  2(b)  below,  at the  Company's  office or agency  in  Nashua,  New
Hampshire,  or such other  office or agency of the  Company as the  Company  may
designate by notice in writing to the holder hereof.

            (b) The aggregate  purchase price for Warrant Shares being purchased
hereunder  may be  paid  either  (i) by cash or  wire  transfer  of  immediately
available funds, or (ii) by surrender of a number of Warrant Shares which have a
fair market value equal to the aggregate  purchase  price of the Warrant  Shares
being purchased (`DIET ISSUANCE") as determined herein. If the Holder elects the
Net Issuance method of payment,  the Company shall issue to Holder upon exercise
a number of shares of Warrant Shares determined in accordance with the following
formula:


                                      -2-
<PAGE>

                                X=      Y(A-B)
                                      ----------
                                          A

      where:      X =   the number of Warrant Shares to be issued to the Holder;
                        the number of Warrant  Shares with  respect to which the
                        Holder is exercising
                  Y =   its purchase rights under this Warrant;  the fair market
                        value of one share of the Warrant Shares on the date of
                  A =   exercise; and
                  B =   the Purchase Price.

No fractional shares arising out of the above formula for determining the number
of shares to be issued to the Holder shall be issued,  and the Company  shall in
lieu thereof  make payment to the Holder of cash in the amount of such  fraction
multiplied  by the fair market  value of one share of the Warrant  Shares on the
date of exercise.  For purposes of the above calculation,  the fair market value
of one share of the  Warrant  Shares  shall mean (a) if the date of  exercise is
after the  commencement of trading of the Common Stock on a securities  exchange
or over-the-counter  but prior to the closing of the IPO, the price per share to
the public set forth on the final prospectus  relating to the IPO, multiplied by
the number of shares of Common Stock into which each share of the Warrant Shares
is then  convertible,  (b) if the Common  Stock is then  traded on a  securities
exchange,  the  average  of the  closing  prices  of such  Common  Stock on such
exchange over the 30 calendar day period (or portion  thereof) ending three days
prior to the date of  exercise,  multiplied  by the  number  of shares of Common
Stock into which each share of the Warrant  Shares is then  convertible,  (c) if
the Common Stock is then regularly traded  over-the0counter,  the average of the
closing sale prices or secondarily the closing bid of such Common Stock over the
30 calendar day period (or portion  thereof) ending three days prior to the date
of exercise,  multiplied by the number of shares of Common Stock into which each
share of the Warrant  Shares is then  convertible,  or (d) if there is no active
public market for the Common Stock,  the fair market value thereof as determined
in good faith by the Board of Directors of the Company, multiplied by the number
of shares of Common  Stock into which each share of the  Warrant  Shares is then
convertible.

            (c) The Company agrees and  acknowledges  that the Warrant Shares so
purchased  shall be deemed to be issued  to the  holder of this  Warrant  as the
record  owner of such  shares as of the close of  business  on the date on which
this Warrant and the  Subscription  Form shall have been surrendered and payment
made for such shares as aforesaid.  Upon receipt thereof,  the Company shall, as
promptly as practicable, and in any event within seven business days thereafter,
execute or cause to be  executed  and  deliver  to the holder of this  Warrant a
certificate or certificates  representing the aggregate number of Warrant Shares
specified in said  Subscription  Form. Each stock certificate so delivered shall
be in such  denomination  as may be required  by the holder of this  Warrant and
shall be registered  in the name of the holder of this Warrant.  If this Warrant
shall  have been  exercised  only in part,  the  Company  shall,  at the time of
delivery of said stock certificate or certificates, deliver to the Warrantholder
a new Warrant

                                      -3-
<PAGE>

evidencing  the rights of such holder to purchase the remaining  Warrant  Shares
covered by this  Warrant.  The Company shall pay all  expenses,  stock  transfer
taxes and other charges payable in connection with the  preparation,  execution-
and delivery of stock certificates pursuant to this Section 2.

            3. Ownership and Transfer of this Warrant.

            (a) The  Company  may deem and  treat the  registered  owner of this
Warrant  as the  holder  and owner  hereof  (notwithstanding  any  notations  of
ownership  or writing  made  hereon by anyone  other than the  Company)  for all
purposes  and  shall  not be  affected  by any  notice  to the  contrary,  until
presentation  of this Warrant for  transfer as provided  herein and then only if
such  transfer  meets the  requirements  of Sections 3 and 5 hereof.  All shares
issuable pursuant to this Warrant,  and all shares of Common Stock issuable upon
conversion thereof, shall be deemed to be "Registrable  Securities" for purposes
of the Third Amended and Restated Investor Rights Agreement dated as of June 30,
2004, among the Company and the stockholders of the Company named therein.

            (b) An  appropriate  legend may be endorsed on the  Warrants and the
certificates representing the Warrant Shares evidencing these restrictions,  and
a stop order may be placed on the Company's transfer records.

            4. EXCHANGE,  TRANSFER OR REPLACEMENT.  Subject to Section 5 hereof,
this  Warrant is  exchangeable  upon the  surrender  hereof by the holder to the
Company at its office or agency  described  in Section 2 hereof for new Warrants
of like tenor and date  representing  in the aggregate the right to purchase the
number of shares of Series C Preferred Stock purchasable hereunder, each of such
new  Warrants to represent  the right to purchase  such number of shares (not to
exceed the aggregate total number purchasable  hereunder) as shall be designated
by the Warrantholder at the time of such surrender. Subject to Section 5 hereof,
this Warrant and all rights  hereunder  are  transferable,  in whole or in part,
upon the books of the  Company  by the  holder  in person or by duly  authorized
attorney,  and a new  Warrant  of the same tenor and date as this  Warrant,  but
registered in the name of the transferee, shall be executed and delivered by the
Company upon surrender of this Warrant,  duly endorsed, at said office or agency
of the Company. Upon receipt by the Company of evidence reasonably  satisfactory
to it of the loss, theft,  destruction,  or mutilation of this Warrant,  and, in
case of loss,  theft,  or  destruction,  of  indemnity  or  security  reasonably
satisfactory  to it, and upon  surrender and  cancellation  of this Warrant,  if
mutilated,  the Company  will make and  deliver a new Warrant of like tenor,  in
lieu of this  Warrant.  This Warrant  shall be promptly  canceled by the Company
upon the  surrender  hereof  in  connection  with  any  exchange,  transfer,  or
replacement.  The Company  shall pay all  expenses,  transfer  taxes,  and other
charges payable in connection with the preparation,  execution,  and delivery of
Warrants pursuant to this Section 4.

            5. INVESTMENT  INTENT.  The Warrant Shares issuable upon exercise of
the  Warrant  and any shares of Common  Stock into which any such  shares may be
convertible  have not been registered under the Securities Act or any applicable
state law. The Warrant is issued to the  Warrantholder on the condition that the
Warrant and any Warrant  Shares  purchased  upon exercise of the Warrant and any
Common Stock into which any such shares may be converted  (excepting  shares for
which a Notification  under  Regulation A or a  Registration  Statement has


                                      -4-
<PAGE>

been filed and declared  effective  and for which such  exercise may be effected
pursuant to registration or an exemption from registration  under any applicable
state law) are or will be  purchased  for  investment  purposes  and not with an
intent to distribute the same.  Prior to making any disposition of this Warrant,
the holder  shall give  written  notice to the  Company  describing  briefly the
manner of any such  proposed  disposition.  The  holder  shall not make any such
disposition,  until and unless (i) such  holder has  delivered  to the Company a
legal  opinion  of  counsel,   reasonably   acceptable  to  the  Company,   that
registration  under  the  Securities  Act and any  applicable  state  law is not
required  with  respect  to  such  disposition,  or  (ii) a  Notification  under
Regulation A or a Registration  Statement covering the proposed distribution has
been filed by the Company and has become  effective  and  applicable  state laws
relating to registration  are complied with. Upon receipt of written notice form
the holder with respect to such proposed distribution,  the Company will use its
best efforts, in consultation with the holder's counsel, to ascertain as soon as
practicable whether or not registration is required,  and will advise the holder
promptly with respect thereto.

            6.  ADJUSTMENT  OF PURCHASE  PRICE.  The  Purchase  Price and/or the
number of Warrant Shares or Other  Securities the  Warrantholder  is entitled to
receive  hereunder  shall  be  subject  to  adjustment  from  time  to  time  as
hereinafter provided.

            (a) STOCK SPLITS,  STOCK DIVIDENDS AND REVERSE  SPLITS.  In case the
      Company  shall at any time  divide the  outstanding  mares of its Series C
      Preferred  Stock into a greater  number of shares  (whether  pursuant to a
      stock split,  stock dividend or  otherwise),  the Purchase Price in effect
      immediately  prior to such division shall be  proportionately  reduced and
      the number of  Warrant  Shares  shall be  proportionately  increased,  and
      conversely,  in the case the outstanding  shares of the Company's Series C
      Preferred  Stock shall be combined  into a smaller  number of shares,  the
      Purchase Price in effect  immediately  prior to such combination  shall be
      proportionately increased and the number of Warrant Shares proportionately
      reduced.

            (b) REORGANIZATION,  CONSOLIDATION, MERGER OR SALE OF ASSETS. If any
      capital  reorganization  or  reclassification  of the capital stock of the
      Company,   or   consolidation  or  merger  of  the  Company  with  another
      corporation,  or the sale of all or  substantially  all of its  assets  to
      another corporation shall be effected in such a way that holders of shares
      of the  Company's  Series C  Preferred  Stock shall be entitled to receive
      stock,  securities  or assets,  with  respect to or in  exchange  for such
      shares,  then,  as a condition of such  reorganization,  reclassification,
      consolidation,  merger or sale,  the holder of this Warrant shall have the
      right to  purchase  and  receive  upon the  basis  and upon the  terms and
      conditions  specified in this Warrant and in addition to or in lieu of, as
      the case may be,  the  shares  of  Series C  Preferred  Stock  immediately
      theretofore  purchasable  and  receivable  upon the exercise of the rights
      represented  hereby,  such shares of stock,  other securities or assets as
      would have been issued or  delivered to the holder of this Warrant if such
      holder had exercised this Warrant and had received such shares of Series C
      Preferred   Stock   prior   to  such   reorganization,   reclassification,
      consolidation,  merger or sale.  The  Company  shall not  effect  any such
      consolidation,  merger or sale,  unless prior to the consummation  thereof
      the successor  corporation (if other than the Company) resulting from such
      consolidation  or merger or the  corporation  purchasing such assets shall
      assume by written instrument  executed and mailed to the registered holder
      of this

                                      -5-
<PAGE>

      Warrant at the last  address of such holder  appearing on the books of the
      Company  the  obligation  to deliver to such  holder such shares of stock,
      securities or assets as, in accordance with the foregoing provisions, such
      holder may be entitled to purchase.

            (c) OTHER ACTIONS.  The issuance of additional  capital stock of the
      Company to persons other than the  Warrantholder in a manner not discussed
      in this Section 6 shall not result in any adjustment in the Purchase Price
      or increase in the number of shares subject to this Warrant.

            (d) NOTICE.  Upon any  adjustment of the Purchase Price or change in
      the number of Warrant Shares or Other Securities  subject to this Warrant,
      the  Company  shall give  written  notice  thereof,  by first  class mail,
      postage prepaid, addressed to the registered holder at the address of such
      holder as shown on the books of the Company,  which notice shall state the
      Purchase  Price  resulting  from  such  adjustment  and  the  increase  or
      decrease,  if any,  in the  number of Warrant  Shares or Other  Securities
      purchasable at such price upon the exercise of this Warrant, setting forth
      in reasonable  detail the method of  calculation  and the facts upon which
      such calculation is based.

            (e) OTHER NOTICES. If at any time:

                  (1) the  Company  shall  declare  any cash  dividend  upon its
Preferred Stock;

                  (2)   there   shall   be   any   capital   reorganization   or
reclassification of the capital stock of the Company; or consolidation or merger
of the  Company  with,  or sale of all or  substantially  all of its  assets to,
another corporation;

                  (3) there shall be a  voluntary  or  involuntary  dissolution,
liquidation or winding-up of the Company; or

                  (4) there shall be an IPO;

then,  in any one or more of said cases,  the Company shall give, by first class
mail, postage prepaid, addressed to the Holder of this Warrant at the address of
such  Holder as shown on the books of the  Company,  (a) at least 20 days  prior
written  notice of the date on which the books of the  Company  shall close or a
record  shall be taken for such  dividend or for  determining  rights to vote in
respect of any such  reorganization,  reclassification,  consolidation,  merger,
sale,  dissolution,  liquidation or winding- up, and (b) in the case of any such
reorganization,  reclassification,  consolidation,  merger,  sale,  dissolution,
liquidation,  winding-up  or public  offering,  at least 20 days  prior  written
notice of the date when the same shall take place;  provided,  however, that the
Holder shall make a best  efforts  attempt to respond to such notice as early as
possible  after the receipt  thereof.  Any notice given in  accordance  with the
foregoing clause (a) shall also specify,  in the case of any such dividend,  the
date on which the holders of  Preferred  Stock shall be  entitled  thereto.  Any
notice given in accordance with the foregoing  clause (b) shall also specify the
date on which the holders of Preferred Stock shall be entitled to exchange their
Preferred  Stock  for  securities  or  other  property   deliverable  upon  such
reorganization,  reclassification,  consolidation,  merger,  sale,  dissolution,
liquidation, winding-up, conversion or public offering, as the case may be.


                                      -6-
<PAGE>

            7. SPECIAL  AGREEMENTS  OF THE COMPANY.  The Company  covenants  and
agrees that it will:

            (a)  reserve  and  set  apart  and  have  at all  times,  free  from
      preemptive  rights, the number of shares of authorized but unissued Series
      C Preferred Stock  deliverable upon the exercise of the Warrants,  and the
      number of shares of Common Stock into which such Preferred  Stock shall be
      convertible,  and it will have at all times any other rights or privileges
      provided for herein  sufficient to enable it at any time to fulfill all of
      its obligations hereunder; and

            (b) keep its books open for transfer of any Warrant  and/or  Warrant
      Shares except as otherwise provided by law.

            8. NOTICES. Any notice or other document required or permitted to be
given or  delivered  to  Warrantholders  shall be delivered or sent by certified
mail to each Warrantholder at the last address shown on the books of the Company
maintained  for the registry and transfer of the  Warrants.  Any notice or other
document  required or permitted to be given or delivered to the Company shall be
delivered or sent by certified  mail to the  principal  office of the Company in
Nashua, New Hampshire, or such other address as shall have been furnished to the
Warrantholders by the Company.

            9. NO RIGHTS AS SHAREHOLDERS;  LIMITATION OF LIABILITY. This Warrant
shall not entitle any holder hereof to any of the rights of a stockholder of the
Company. No provision hereof, in the absence of affirmative action by the holder
hereof to purchase shares of Common Stock, and no mere enumeration herein of the
rights or privileges of the holder  hereof,  shall give rise to any liability of
such holder for the Purchase Price or as a stockholder  of the Company,  whether
such liability is asserted by the Company or by creditors of the Company.

            10.  GOVERNING LAW. This Warrant shall be governed by, and construed
and enforced in accordance with, the laws of the State of Delaware.

            11. SUCCESSORS AND ASSIGNS. The terms and provisions of this Warrant
and the  Agreement  shall  inure to the  benefit  of, and be binding  upon,  the
Company and the holders hereof and their respective successors and assigns.

            12.  MISCELLANEOUS.  This Warrant and any  provision may be changed,
waived,  discharged or terminated only by an instrument in writing signed by the
party (or any predecessor in interest  thereof) against which enforcement of the
same is sought.  The headings in this Warrant are for purposes of reference only
and shall not  AFFECT  the  meaning  or  construction  of any of the  provisions
hereof.

            13.  INDEMNIFICATION.  The Company hereby  indemnifies the holder of
this  Warrant  and of any  Warrant  Shares  issued or  issuable  hereunder,  its
officers and  directors,  and any person who controls the holder of this Warrant
or such  holder of  Warrant  Shares  within  the  meaning  of  Section 15 of the
Securities Act, against all losses,  claims,  damages, and liabilities caused by
any untrue statement of a material fact contained in any registration statement,
prospectus, notification or offering circular (and as amended or supplemented if
the Company shall have furnished any  amendments or supplements  thereto) or any
preliminary  prospectus  or caused by any  omission to state  therein a material
fact required to be stated therein or necessary to make the  statements  therein
not misleading,  except insofar as such losses, claims,  damages, or liabilities
are caused

                                      -7-
<PAGE>

by any untrue  statement  or omission  contained  in  information  furnished  in
writing to the Company by such holder  expressly for use therein,  and each such
holder by its  acceptance  hereof  severally and not jointly agrees that it will
indemnify  and hold  harmless the Company and each of its officers who sign such
registration  statement and each of its  directors and each person,  if any, who
controls the Company within the meaning of Section 15 of the Securities Act with
respect to losses, claims, damages or liabilities which are caused by any untrue
statement  or omission  contained  in  information  furnished  in writing to the
Company by such holder expressly for use therein.


                                      -8-
<PAGE>

            IN WITNESS WHEREOF, the Company has caused this Warrant to be signed
by a duly authorized officer effective as of the ___ day of ______, 2004.

                                        OVATION PRODUCTS CORPORATION


                                        By: ____________________________________


                                      -9-
<PAGE>

                             FULL SUBSCRIPTION FORM

TO BE EXECUTED BY THE REGISTERED  WARRANTHOLDER IF SUCH WARRANTHOLDER DESIRES TO
EXERCISE, IN FULL, THE WARRANT.

            The undersigned  (the  "Subscriber")  hereby  exercises the right to
purchase ______ shares of Series C Preferred Stock covered by the within Warrant
at the  date of this  subscription  and  herewith  makes  payment  of the sum of
$______  representing  the Purchase Price of $______ per share in effect on this
date.  Certificates for such shares shall be issued in the name of and delivered
to the Subscriber, unless otherwise specified by written instructions, signed by
the Subscriber and accompanying this subscription.

            The  Subscriber  understands  that the Company may be issuing  these
shares  to it in  accordance  with the  exemption  from  registration  under the
Securities  Act of 1933,  as amended (the "Act")  afforded to  transactions  not
involving any public  offering and that such exemption from  registration is not
available if the Subscriber  acquires the shares with a view to  distribution of
said shares in a manner  prohibited by the provisions of the Act. If such shares
have not been  registered  under the Act, then the Subscriber  represents to the
Company that it is acquiring said shares for its own account, and not as nominee
for any other person or entity, for investment and not for distribution.

            The Subscriber  understands  and agrees that the stock  certificates
evidencing the shares will,  unless such shares have been  registered  under the
Act, be stamped with  substantially the following legend and that it will comply
with the terms of said legend:

      "The shares represented by this certificate have not been registered under
      the Securities Act of 1933 (the "Act"),  but have been issued  pursuant to
      an exemption thereto.  The registered holder of such shares has agreed not
      to effect a disposition  of such shares until  either:  (1) the holder has
      received   the  opinion  of  counsel   acceptable   to  the  Company  that
      registration  under  the  Act  is  not  required,  or  (2) a  registration
      statement  under the Act covering such shares and  disposition  has become
      effective under the Act."

Dated: ____________________

                                        Name: __________________________________

                                        Signature ______________________________

                                        Address: _______________________________