What is REQUIRED of copper water tube boilers to prevent thermal stress

A dual thermal overload switch is a safety feature designed to shut down the boiler if it overheats, but it does not actively prevent thermal stress during operation. While it enhances safety by protecting against excessive temperature, it does not address the root cause of thermal stress, which is uneven heating and cooling.

Cross-sectional bracing serves to provide structural support to the boiler and improve its stability under operational conditions. However, it does not mitigate thermal stress, which arises from temperature variations within the boiler tubes. Bracing may prevent physical deformation but does not influence thermal dynamics.

Glycol additives are often used in heating systems to lower the freezing point of water and provide antifreeze properties. While they can enhance the thermal properties of the water, they do not address the critical need for constant circulation, which is necessary to prevent thermal stress caused by localized heating.