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Heat Exchanger to Preheat Service/Domestic Hot Water

I would like to preheat water into a WaterHeater:Mixed with the use of a fluid-to-fluid heat exchanger. The WaterHeater is used for service hot water. Is there a way I can setup the supply side to preheat the domestic supplied water?

Right now I have this setup but no preheating is occurring before the WaterHeater:Mixed. Hot Water Plant Loop

Heat Exchanger to Preheat Service/Domestic Hot Water

I would like to preheat water into a WaterHeater:Mixed with the use of a fluid-to-fluid heat exchanger. The WaterHeater is used for service hot water. Is there a way I can setup the supply side to preheat the domestic supplied water?

Right now I have this setup but no preheating is occurring before the WaterHeater:Mixed. Hot Water Plant Loop