Effective September 18, 2015

Standard Information
Standard Number:
ANSI Z21.23
Standard Name:
Gas Appliance Thermostats
Standard Edition and Issue Date:
11th Edition Dated October 1, 2010
Date of Revision:
October 1, 2010
Date of Previous Revisions to Standard:
11th Edition Revised April 1, 2005
Effective Date of New/Revised Requirements

Effective Date (see Schedule below): September 18, 2015

Impact, Overview, Fees and Action Required

Impact Statement: A review of all Listing Reports is necessary to determine which products comply with new/revised requirements and which products will require re-evaluation. NOTE: Effective immediately, this revised standard will be exclusively used for evaluation of new products unless the Applicant requests in writing that current requirements be used along with their understanding that their listings will be withdrawn on Effective Date noted above, unless the product is found to comply with new/revised requirements.

Overview of Changes:Revised or added requirements to the Manufacturing and Production Line Test requirements. Specific details of new/revised requirements are found in table below.

Schedule: So that shipping of products with Listing Marks will not be interrupted, an approximate schedule has been established to ensure Listing Reports are found compliant by Effective Date:

  • September 18, 2015 = Effective Date – ATM Suspended for all non-compliant Reports

Fees: An initial review of Listing Report (s) will be covered by a direct billing project and will be invoiced at not more than $1000 per report.

Client Action Required:

Information - To assist our Engineer with review of your Listing Reports, please submit technical information in response to the new/revised paragraphs noted in the attached or explain why these new/revised requirements do not apply to your product (s).

Current Listings Not Active? – Please immediately identify any current Listing Reports or products that are no longer active and should be removed from our records. We will do this at no charge as long as Intertek is notified in writing prior to the review of your reports.

Description of New/Revised Technical Requirements
  The Underlined portion below has been changed or added. 

The manufacturer shall conduct the following tests on each thermostat at room temperature (as applicable). The manufacturer shall submit to the certifying agency a description of the test procedures used during production testing.

a. Leakage (internal and external).

b. Dielectric Strength.

CUSTOMERS PLEASE NOTE: This Table and column "Verdict" can be used in determining how your current or future production is or will be in compliance with new/revised requirements.

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