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The Bard 8402-182 Water Temperature Limit is an OEM temperature safety control used in Bard HVAC hydronic or domestic hot water accessory applications to help prevent overheating by opening the control circuit when water temperature rises beyond the switch setpoint. Replacing a weak or nuisance-tripping limit is a common fix when a system locks out on high temperature, cycles erratically, or cannot maintain stable water heating operation. Because limit controls are selected by temperature rating, reset type, and mounting style, confirm 8402-182 against your Bard unit model and service literature before ordering to ensure proper fit and safe operation.