Motorised valves control the flow of water in hot water and central heating systems. An electronic trigger turns the valve on and off to direct the water either to be heated for hot water or to circulate within the heating system. Without a functioning motorised valve, water will not be pumped around the system. 2 port motorised valves are commonly used when there is a one pump in the system, alternatives are used if both heating and hot water systems are pumped.
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