Yes, tankless water heaters can recirculate hot water when equipped with a recirculation system, ensuring instant hot water availability at taps.
Tankless water heaters provide endless hot water on demand while saving energy and space. But one common frustration is waiting for hot water to reach faucets. The solution? A recirculation system. This article explains how tankless recirculation works and helps you choose the best option for your home.
How Tankless Water Heater Recirculation Works
When you turn on a hot water tap, cold water sits in the pipes until hot water arrives from the heater. A recirculation pump solves this by:
- Keeping hot water moving through pipes
- Returning cooled water to be reheated
- Providing instant hot water at every fixture
Some tankless models like Noritz include built-in recirculation pumps. For others, you can add an external pump.
Two Types of Recirculation Systems
1. Dedicated Return Line System
This professional-grade solution adds a separate return pipe that creates a complete hot water loop:
| Pros | Cons |
|---|---|
| Best for large homes (6+ bathrooms) | Higher installation cost |
| Consistent performance | Requires extensive plumbing work |
Ideal for new construction where pipes are accessible. For existing homes, consider our guide to HVAC duct modifications which face similar installation challenges.
2. Crossover Valve System
A more affordable retrofit option that uses existing cold water pipes as the return path:
- Installs at farthest fixture from heater
- No additional piping required
- Lower installation cost
According to Monkey Wrench Plumbing, crossover valves work well in most homes under 3,000 sq ft.
Key Benefits of Recirculation
1. Instant Hot Water
No more waiting – hot water arrives immediately at every tap.
2. Water Conservation
Saves up to 30 gallons daily by eliminating cold water waste.
3. Energy Efficiency
Modern pumps use minimal electricity while providing maximum comfort.
4. Cost Savings
Most systems pay for themselves in 2-3 years through lower water and energy bills.
Installation Considerations
Professional Installation Recommended
Proper sizing and placement are critical for performance and efficiency. Our HVAC tools guide shows the specialized equipment professionals use for such installations.
Smart Controls
Newer systems offer:
- Programmable timers
- Motion sensors
- Smartphone control
Maintenance Needs
Annual flushing prevents mineral buildup that can reduce efficiency.
Is Recirculation Right For You?
Consider a recirculation system if:
- You frequently wait for hot water
- Your home has long pipe runs
- You want to reduce water waste
- Your tankless model supports it
For homes with very short pipe runs, the benefits may not justify the cost.
