Boiler thermal protection devices and systems that protect the boiler against overheating and the effects of too high water or exhaust gas temperatures. They include, among others: temperature sensors, safety thermostats and thermal switches that automatically cut off the fuel or electricity supply in the event of a threat. Thanks to them, the boiler operates in safe conditions, minimizing the risk of failure and damage to the installation. The use of thermal protection increases the reliability and extends the life of the heating device.