New York Codes, Rules and Regulations
Title 12 - DEPARTMENT OF LABOR
Chapter I - Industrial Board Of Appeals
Subchapter A - The Industrial Code
Part 4 - Low Pressure Boilers
Subpart 4-5 - Specific Requirements For Low Pressure Heating System Boilers
Section 4-5.12 - Combustion regulators

Each automatically fired hot water heating boiler shall be provided with a temperature actuated control which win control the rate of combustion to prevent the temperature of the water from rising above 250° F at or near the boiler outlet and each automatically fired steam boiler shall be provided with a pressure-actuated combustion control which shall operate to prevent the steam pressure from rising above 15 psi. Such control for a hot water boiler shall be incapable of being set so as to permit operation of the heat generating apparatus if the temperature of the water is higher than 250° F.