What is the minimum temperature rating for all valves or cocks on a heating boiler?

The minimum temperature rating for all valves or cocks on a heating boiler is established to ensure safe and efficient operation under the conditions that a boiler encounters. A rating of 250°F is necessary because it reflects the operational requirements and safety standards critical in heating systems.

Valves and cocks must withstand not just the temperatures produced during operation but also any potential temperature spikes that could occur during service. The 250°F rating ensures that these components remain functional and safe under maximum working conditions, contributing to the overall integrity and reliability of the heating system.

Lower temperature ratings might not provide the necessary durability and safety features required for high-pressure and high-temperature applications typically found in heating boilers. Thus, the higher specification of 250°F is crucial in maintaining the performance and safety standards expected in professional installations.