Rheem Home Comfort WiFi Module for Electric Water Heaters - REWRA631EWH Enables your compatible Rheem electric water heater to communicate through your in-home WiFi broadband Internet connection Easy to set up - includes necessary components and step-by-step guide Cost-saving Vacation Mode is easy to set from your mobile device - saving energy and money while you're away Leak detection alert sent to your mobile device in the event water is detected outside the unit Time saving error codes speed up service calls in the event service is needed - share error code with your contractor ahead of time