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Inconsistent Hourly Results Hot Water

I'm extracting the hourly run period consumptions from several simulations and I'm getting inconsistent results between the Energy Plus HTML report and the hourly output.

I'm pulling: Output:Variable, *, !- Key Value Water Heater NaturalGas Energy, !- Variable Name Hourly; !- Reporting Frequency

When i sum the hourly output I'm getting 20% less energy than the HTML report for Water Heating Energy Consumption. What am I doing wrong or is there a simulation error? I checked the output units in Wh to Therms and i'm finding the mismatch. I would have expected these two values to be the same.

Services used: Open Studio Application 3.5.1 Energy Plus 22.2.0 DView: Windows 64

I upload 4 files to github that could help recreate the error, they are all from the same simulation. https://github.com/SDonohueRI/Energy-Plus

Inconsistent Hourly Results Hot Water

I'm extracting the hourly run period consumptions from several simulations and I'm getting inconsistent results between the Energy Plus HTML report and the hourly output.

I'm pulling: Output:Variable, *, !- Key Value Water Heater NaturalGas Energy, !- Variable Name Hourly; !- Reporting Frequency

When i sum the hourly output I'm getting 20% less energy than the HTML report for Water Heating Energy Consumption. What am I doing wrong or is there a simulation error? I checked the output units in Wh to Therms and i'm finding the mismatch. I would have expected these two values to be the same.

Services used: Open Studio Application 3.5.1 Energy Plus 22.2.0 DView: Windows 64

I upload 4 files to github that could help recreate the error, they are all from the same simulation. https://github.com/SDonohueRI/Energy-Plus