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The expansion vessel resistor is an electrical component used in some boiler systems to monitor or protect the expansion vessel. It may be part of a sensor circuit that detects the vessel's condition or a heating element to prevent freezing in cold environments. This resistor is designed to meet the specific electrical requirements of the boiler's control system. If your boiler is showing errors related to the expansion vessel or if the vessel is not functioning correctly, this resistor might need replacement. Always verify compatibility with your boiler model before installation. Proper functioning of this component contributes to the overall reliability and safety of the heating system.