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I believe I found the answer in the .mdd file. I believe this would be different for every run.
The Annual Building Utility Performance Summary (html) includes Water Heater Off and On Cycle Parasitic Energy. I pulled this below from my .mdd file.
For Meter=WaterSystems:NaturalGas [J], ResourceType=NaturalGas, EndUse=WaterSystems, contents are: 600 GAL WATER HEATER - 600 KBTU/HR:Water Heater NaturalGas Energy 600 GAL WATER HEATER - 600 KBTU/HR:Water Heater Off Cycle Parasitic NaturalGas Energy 600 GAL WATER HEATER - 600 KBTU/HR:Water Heater On Cycle Parasitic NaturalGas Energy
As i understand it, the total Water System: Natural Gas energy consumption is the Water Heater Natural Gas Energy plus the on and off cycle parasitic losses. I believe I had been missing those meters.
This is a little confusing because I would have assumed the parasitic energy would already be included in the Water Heater's Natural Gas Energy?