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The Resideo L4008E1156 is a Manual Reset Aquastat, a safety control device used in hydronic heating systems. It contains a sensor bulb connected by a capillary tube to a switch. The sensor bulb is placed in direct contact with the boiler water or heating tank. As the water temperature rises, a liquid expands within the capillary tube, tripping the switch and interrupting the heating system's electrical circuit. This prevents the water from overheating and potentially damaging the boiler or creating a safety hazard. <br><br>
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