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The documentation appears to be incorrect; the output variables are "Cooling Coil Foo", not "Heating Coil Foo". We've been using "Cooling Coil Water Heating Electricity Energy" in our modeling workflow to successfully get the energy use.

Interestingly, note that the description of the Coil:WaterHeating objects all say:

From the air-side heat transfer perspective, the water-heater receives heating energy from air. Thus it is considered as a cooling coil, and the output variable names are using “Cooling Coil”.

But then the output variables in the documentation don't reflect that statement.

So it looks like the output variables for Coil:WaterHeating:AirToWaterHeatPump:VariableSpeed are correctly labeled as "Cooling Coil" while Coil:WaterHeating:AirToWaterHeatPump:Pumped and Coil:WaterHeating:AirToWaterHeatPump:Wrapped are incorrectly labeled in the documentation.