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If I understand your question correctly, here's one (untested) option to try. The boiler loop supplies hot water to ZoneHVACBaseboardConvectiveWater and HeatExchangerFluidToFluid objects. The SHW loop is heated by the HX from the boiler loop and a WaterHeaterMixed object.

Boiler Loop

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SHW Loop

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If I understand your question correctly, here's one (untested) option to try. The boiler loop supplies hot water to ZoneHVACBaseboardConvectiveWater and HeatExchangerFluidToFluid objects. The SHW loop is heated by the HX from the boiler loop and a WaterHeaterMixed object.object.

This configuration is meant to model a storage SHW system where supplemental heat is supplied by a boiler through a HX inside the tank.

Boiler Loop

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SHW Loop

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