I also have installed a Rheem last year. If you connect it to your home’s WiFi, you’ll get usage data. It appears my Sense is under reporting, showing only half of the usage data. It doesn’t seem to matter which of the 3 modes I choose:
Automate Savings, Most Efficient, High Demand
I wrote extensively about my experience with this water heater here:
Replaced my failed gas water heater with a much more efficient Rheem hybrid electric with WiFi, its quiet heat pump is also dehumidying and cooling my basement
and in this section I have screenshots of the Sense data versus the Rheem data.