Hot Water Recirculation Design
Calculate recirc system requirements
Piping Details
Include supply and return (if dedicated)
Temperature Settings
Recirculation Results
Required Flow Rate
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Heat Loss
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Pump Size
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Return Line Size
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Annual Energy Cost
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System Comparison
| System | Pros | Cons |
|---|---|---|
| Dedicated Return | Most efficient, instant hot water | Requires return piping |
| Demand System | Energy efficient, retrofit | Short wait time |
| Crossover | No return pipe needed | Cold water warm-up |
Design Considerations
Pump Selection
- Bronze or stainless pump
- 1/25 to 1/6 HP typical
- Timer or aquastat control
- ECM pumps save energy
Energy Saving Tips
- Timer during occupied hours
- Aquastat with deadband
- Demand pump activation
- Proper pipe insulation
Code Requirements
- Check valve at return
- Balancing valves per branch
- Insulation per energy code
- Thermal expansion tank