It is designed to regulate the access of air to the combustion chamber and the temperature of the coolant in the boiler by opening or closing the air damper.
They are installed on solid fuel boilers and regulate air access to the combustion chamber and water temperature in the pipeline.
The model with a chain has a removable sleeve that allows you to change the thermostatic sensor and clean it without draining the water from the heating system.
Body and immersion sleeve made of nickel-plated brass.
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