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Zone Valves Play an Important Role in your Hot Water Heating System By Mark J. Donovan Is your hot water heating system continuously running or not working at all? When you turn down the thermostat does hot water continue to flow through your hot water heating system? If so, it is possible that you have a failed hydronic zone valve. A hydronic zone valve is used in hot water heating systems. In conjunction with your home’s thermostat, circulating pump and boiler, the hydronic zone valve helps control the flow of…https://homeadditionplus.com/dev/wp-content/uploads/2016/12/Zone_Valve_1.jpg308267