Rheem RTG20006DW UMC-117 Water Heater Controller
A Rheem UMC-117 main remote control pad used with compatible Rheem tankless water heaters to adjust set temperature and access maintenance/diagnostic information when a wired controller is required.
Key Features
- UMC-117 main remote-control pad
- Designed to allow easy temperature adjustment
- Provides access to maintenance information
- Supports connecting up to 3 remote controls to the same tankless system
- Listed as replacing RTG20006EF
- Rheem notes the UMC-117 remote control operation can be set from 100°F up to a maximum of 140°F
Compatibility & Applications
- Listed as a Rheem tankless water heater controller
- Must only be used where the manufacturer specifies this exact part number: RTG20006DW.
Installation & Operation Notes
- Installation should be performed by a qualified service technician, following the tankless water heater's service/installation manual and any controller instructions.
- Confirm correct wiring/connection points and mounting location per the water heater documentation before energizing the unit.
- After installation, verify the controller powers up, communicates properly, and allows temperature adjustment within the manufacturer-stated range.
Maintenance & Troubleshooting
- This controller is commonly used to view maintenance/diagnostic information and read error codes on the tankless unit.
- If the unit is not responding to temperature changes or codes cannot be accessed, follow the water heater troubleshooting steps to confirm wiring/connection integrity and proper controller configuration for the specific model.
User Reviews & Q&A Summary
- Easy install / works as intended: Reviewers frequently describe it as straightforward to install and functioning properly right after install.
- Needed for temperature control and diagnostics: Common use cases include raising/adjusting temperature and using the controller to read tankless error codes.
- Replacement of worn controller: Multiple reviews describe replacing an older/worn-out controller and reporting the new one works perfectly.
- Strong shipping/service experience: Many comments focus on fast delivery, arriving earlier than expected, and smooth ordering/returns experiences.