These requirements apply to newly produced gas appliance thermostats of the integral gas valve type having a maximum operating gas pressure of ½ psi (3.5 kPa) or electric type. This Standard does not apply to an electric type comfort heating thermostat (wall-mounted) for installation remote from an appliance. When the operating performance characteristics of the thermostat can be affected by the separate components, such as power supply, transformer and valve(s), the thermostat shall be tested as part of a complete system. Compliance of a device with this standard does not imply that such device is acceptable for use on gas appliances without supplemental tests with the device applied to the particular appliance design.
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ANSI Z21.23b-2005 - Addenda 2 to ANSI Z21.23-2000, Gas Appliance Thermostats
ANSI Z21.23a-2003 (R2005) - Addenda 1 to ANSI Z21.23-2000, Gas Appliance Thermostats