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                                                                    Exhibit 31.2
                                 CERTIFICATIONS

I, Larry T. Guillemette, certify that:

1.   I have reviewed this quarterly report on Form 10-Q of AMTROL Inc;

2.   Based on my knowledge, this quarterly report does not contain any untrue
     statement of a material fact or omit to state a material fact necessary to
     make the statements made, in light of the circumstances under which such
     statements were made, not misleading with respect to the period covered by
     this quarterly report;

3.   Based on my knowledge, the financial statements, and other financial
     information included in this quarterly report, fairly present in all
     material respects the financial condition, results of operations and cash
     flows of the Registrant as of, and for, the periods presented in this
     quarterly report;

4.   The Registrant's other certifying officers and I are responsible for
     establishing and maintaining disclosure controls and procedures (as defined
     in Exchange Act Rules 13a-15(e) and 15d-15(e)) for the Registrant and have:

          a.   Designed such disclosure controls and procedures, or caused such
               disclosure controls and procedures to be designed under our
               supervision, to ensure that material information relating to the
               Registrant, including its consolidated subsidiaries, is made
               known to us by others within those entities, particularly during
               the period in which this quarterly report is being prepared;

          b.   (Paragraph omitted in accordance with SEC transition instructions
               contained in SEC Release 34-47986)

          c.   Evaluated the effectiveness of the Registrant's disclosure
               controls and procedures and presented in this report our
               conclusions about the effectiveness of the disclosure controls
               and procedures, as of the end of the period covered by this
               quarterly report based on such evaluation; and

          d.   Disclosed in this quarterly report any change in the Registrant's
               internal control over financial reporting that occurred during
               the Registrant's most recent fiscal quarter (the Registrant's
               fourth fiscal quarter in the case of an annual report) that has
               materially affected, or is reasonably likely to materially
               affect, the Registrant's internal control over financial
               reporting; and

5.   The Registrant's other certifying officers and I have disclosed, based on
     our most recent evaluation of internal control over financial reporting, to
     the Registrant's auditors and the audit committee of the Registrant's Board
     of Directors (or persons performing the equivalent functions):

          a.   All significant deficiencies and material weaknesses in the
               design or operation of internals control over financial reporting
               which are reasonably likely to adversely affect the Registrant's
               ability to record, process, summarize and report financial
               information; and

          b.   Any fraud, whether or not material, that involves management or
               other employees who have a significant role in the Registrant's
               internal control over financial reporting.

Date:     August 13, 2004                      By: /s/LARRY GUILLEMETTE
                                               -------------------------------
                                                   Larry T. Guillemette
                                                   Executive Vice President,
                                                   Chief Financial Officer and
                                                   Treasurer
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