The Rheem tankless water heater recirculation pump improves hot water delivery by circulating water, reducing wait times and conserving water in your home.
A Rheem tankless water heater recirculation pump eliminates the wait for hot water by maintaining a constant flow. This guide covers how it works, benefits, installation tips, and smart controls for maximum efficiency.
How Rheem Recirculation Pumps Work
Rheem’s built-in recirculation pump (available in SR-Series and RTGH models) circulates hot water through your pipes continuously or on demand. When paired with a crossover valve at your farthest fixture, it creates a loop that keeps hot water ready at every tap.
The Recirculation Process
- Pump activates when temperature drops below set point (typically 107°F)
- Hot water circulates through supply lines and returns via dedicated return line or cold water pipe
- System shuts off after reaching temperature or 7-minute timeout
Key Components
| Component | Function |
|---|---|
| Taco 0015 Pump | Circulates water at 15 GPM with built-in check valve |
| Crossover Valve | Allows cold water line to function as return path |
| EcoNet Controller | Enables smart scheduling via mobile app |
Benefits of Rheem’s Recirculation System
Water and Energy Savings
Rheem’s system saves up to 12,000 gallons annually by eliminating wait times. The optimal temperature settings further reduce energy use by 34% compared to tank heaters.
Installation Advantages
- 1/2″ side clearance allows tight space installation
- PVC venting reduces material costs
- Works at altitudes up to 10,200 feet
Smart Control Options
Wi-Fi enabled models feature:
- Mobile app temperature adjustment
- Usage tracking and leak detection
- Custom recirculation schedules
For whole-home efficiency, pair with smart HVAC vents to optimize your heating system.
Installation Considerations
With Dedicated Return Line
Ideal for new construction, provides fastest hot water delivery with separate copper return piping.
Without Return Line (Crossover Valve)
Uses existing cold water pipes as return path. Valve installs under farthest sink – typically bathroom or kitchen.
Pump Specifications
- Max head pressure: 15 feet
- Pipe size compatibility: 1/2″ to 3/4″
- Power draw: 45W (plug-in or hardwired)
Maintenance Tips
Annual maintenance ensures peak performance:
- Flush system with vinegar solution
- Check crossover valve for debris
- Inspect pump bearings
- Verify condensate neutralizer function
For hard water areas, consider Rheem’s recommended descaling kits to prevent mineral buildup.
Comparing Rheem Recirculation Models
| Model | Flow Rate | Wi-Fi | Best For |
|---|---|---|---|
| SRT-75 | 7.5 GPM | Yes | 2-3 bathroom homes |
| RTGH-95 | 9.5 GPM | Yes | Large families |
| AP17920 Kit | 6.0 GPM | No | Retrofit existing units |
The Home Depot offers complete installation kits with all necessary components for DIYers.
Troubleshooting Common Issues
Pump Runs Continuously
Check crossover valve installation and temperature sensor. Most systems should cycle off after 7 minutes.
Insufficient Hot Water
Verify pipe insulation and consider increasing pump speed if using long runs of 1/2″ pipe.
Error Codes
Consult manual for specific codes. Common issues include flow sensor faults or overheating.
