Question-and-Answer Resource for the Building Energy Modeling Community
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The difference between a water heater and boiler is that only the boiler is setup to respond to plant operation schemes that dispatch load to the supply machines. The water heater's use side is basically passive, flow needs to be pushed through it by other things. I would look into how the primary HW loop is controlled and I imagine there would need to be some considerable differences between the two cases. I find that when you have tanks on the supply side of a complex plant, it is helpful to use a fluid HX on the demand side to control flow through the tanks.
