You can contact Rheem by calling them at 1-800-432-8373 or via their website.
For questions related to Eco Net call 1-800-255-2388.
For hybrid heat pump water heater technical support call 1-800-995-0982.  The hybrid heat pump water heater technical support line's hours are 8:00AM to 5:00PM Central Time.  The staff at Rheem are very knowledgable, but you can expect long wait times midday.  Call early in the morning for faster response times.