Question-and-Answer Resource for the Building Energy Modeling Community
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I'd put the natural gas boiler and the solar collector on the supply side of one plant loop and then a hot water heater with no heating capacity on the supply side of another plant loop. You can then put the hot water heater with zero capacity on the demand side of the plant loop with the boiler/solar collector. I'd love to have this methodology endorsed/criticized by someone else though.
Loop One:
Loop Two:
