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603.3.7.2 Solar Thermal
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Equipment and systems providing heat to fluids or gases through the capture of solar energy shall be capable of being metered so that the peak thermal energy (Btu/h) provided to the building and its systems or to off-site entities can be determined at 15-minute intervals and the amount of heat captured (Btu) for delivery to the building and its systems can be determined intervals of 1 hour or less.
Exception: Systems with a rated output of less than 100 kBtu/hr shall not be required to have the capacity to be metered.