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Can a broken thermostat on an oil boiler cause hot water to flow out through the expansion pipe?

A broken thermostat on an oil boiler can cause the boiler to overheat, but it usually will not cause hot water to flow out through the expansion pipe. The expansion pipe is a safety feature designed to relieve pressure from the boiler when the water temperature reaches a certain point. If the expansion pipe is flowing constantly, it is likely that there is a problem with the pressure release valve or the pressure relief valve.
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