A tankless water heater system including a tankless water heater assembly anda mixing valveassembly enclosed within a system housing. The mixing valve assembly is formedby a onepiece mixing valve housing that defines an unheated water path proceeding tothe heaterassembly and a heated water path proceeding from a hot water inlet passagewayto a mixedwater outlet passageway. Water flow through the mixed water passageway iscontrolled bymixing valve that includes a shuttle operably coupled to a thermostatic motor.
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