Water heater for removing particulates and returning water without particulates to heater, and method of operating same

摘要

A water heater for heating water containing particulates comprises a recirculating path responsive to water and particulates in the heater. The recirculating path removes particulates from the water flowing therein and returns water with particulates removed from it to the heater. The path includes a particulate filter for removing particulates from the water flowing in the path and a pump for pumping water in the path back into the heater. The path is responsive to a liquid cleaning agent applied to the heater with the water returned to the heater.