EcoSmart ECO 11
EcoSmart ECO 11 Electric Tankless Water Heater
Model: ECO 11
Introduction
The EcoSmart ECO 11 Electric Tankless Water Heater is designed to provide efficient, on-demand hot water for various applications. Its compact size and advanced self-modulating technology ensure a continuous supply of hot water while minimizing energy consumption. This manual provides essential information for the proper installation, operation, and maintenance of your EcoSmart ECO 11 unit.
Key features include:
- Endless On-Demand Hot Water: Consistent hot water when you need it that never runs out. Continuously monitored water temperature and controlled flow rates ensure efficiency and consistent performance within 1 degree of selected temperature.
- Space-Saving Design: 90% smaller than traditional tank heaters, allowing for flexible installation on a wall or at the point of use. Dimensions: 11.5 x 8 x 3.75 inches.
- Energy Efficient: 99% thermal energy efficient, only heating water when called, unlike tank heaters that maintain water temperature even when not being used.
- Optimal Sizing: 13-kilowatt unit ideal for providing hot water for a bathroom, small sink, office breakroom, and other point-of-use or low-flow applications. Provides between 1.3 and 3.1 gallons-per-minute depending on the inlet water temperature.
Setup and Installation
Proper installation is crucial for the safe and efficient operation of your EcoSmart ECO 11 water heater. It is recommended that installation be performed by a qualified professional.
Electrical Requirements
The EcoSmart ECO 11 requires specific electrical infrastructure:
- Voltage: 220-240 Volts
- Wattage: 13000 watts (13KW)
- Amperage Draw: 54 Amps
- Circuit Breaker: Requires 1x 60 AMP double-pole circuit breaker
- Required Wiring: #6 AWG
Ensure your electrical panel can accommodate these requirements. Consult with a licensed electrician if unsure.

Figure 1: Electrical requirements for the EcoSmart ECO 11, showing 54 Amps power, 1 double pole, and a 60 Amp breaker.
Plumbing Connections
Connect the cold water inlet and hot water outlet pipes to the designated ports on the unit. Ensure all connections are secure and leak-free. The unit is designed for easy plumbing hook-up.

Figure 2: Internal components and connection points of the EcoSmart ECO 11 water heater.
Physical Dimensions and Placement
The compact size of the ECO 11 allows for versatile installation options:
- Product Dimensions: 11.5 inches (Height) x 8 inches (Width) x 3.75 inches (Depth).
- Mounting Type: Wall-mounted.
- Placement: Can be installed at the point of use, such as under a kitchen sink, near a washing machine, in a guest house, or even on a boat or RV.

Figure 3: Detailed dimensions of the EcoSmart ECO 11 unit.

Figure 4: Example installations demonstrating point-of-use applications throughout a home.
Operating Instructions
The EcoSmart ECO 11 features a user-friendly digital temperature control for precise hot water delivery.
Temperature Control
The unit allows you to set your desired water temperature in increments of 1 degree Fahrenheit. The temperature range is from 80°F to 140°F.
- To Turn On/Off: Press the central knob for 3 seconds.
- To Adjust Temperature: Rotate the central knob to increase or decrease the setting. The digital display will show the selected temperature.

Figure 5: The front panel of the EcoSmart ECO 11 with its digital temperature display and control knob.
Flow Rate and Sizing
The ECO 11 provides hot water based on the inlet water temperature and flow rate. It can deliver between 1.3 and 3.1 gallons-per-minute (GPM).
- In colder climates (lower inlet water temperature), the GPM will be lower.
- In warmer climates (higher inlet water temperature), the GPM will be higher.
Refer to the sizing guide below to determine the optimal performance for your specific location and usage needs.

Figure 6: Sizing chart and map illustrating GPM capacity based on regional inlet water temperatures.
Official Product Video: Why Purchase a Tankless Water Heater
This video from Amazon Tools & Home Improvement explains the benefits and advantages of purchasing a tankless water heater, including space-saving, efficiency, and temperature control.
Maintenance
Regular maintenance helps ensure the longevity and efficiency of your EcoSmart ECO 11 water heater.
- Descaling: In areas with hard water, mineral deposits (calcium) can build up on the heating elements. Regular descaling with vinegar or a suitable descaling solution is recommended to maintain efficiency.
- Check Connections: Periodically inspect all water and electrical connections for any signs of leaks or wear.
- Clean Exterior: Keep the exterior of the unit clean and free from dust and debris.
Troubleshooting
If you experience issues with your EcoSmart ECO 11, consider the following common troubleshooting steps:
- No Hot Water: Check the circuit breaker to ensure it hasn't tripped. Verify that the unit is powered on and the temperature is set correctly. Ensure sufficient water flow.
- Insufficient Hot Water: This can be due to a very low incoming water temperature or excessive flow rate. Adjust the temperature setting or reduce the flow rate at the faucet. Mineral buildup on heating elements can also reduce efficiency; consider descaling.
- Leaks: Immediately shut off water supply and power to the unit. Inspect all plumbing connections for tightness. If leaks persist, contact a qualified plumber.
- Error Codes: Refer to the detailed user manual (link in Warranty & Support section) for specific error code interpretations and solutions.
For persistent issues, contact EcoSmart customer support.
Specifications
| Feature | Value |
|---|---|
| Brand | EcoSmart |
| Model | ECO 11 |
| Product Dimensions | 8"W x 11.5"H x 3.75"D |
| Color | White |
| Wattage | 13000 watts |
| Voltage | 220 Volts |
| Maximum Flow Rate | 3.1 Gallons Per Minute |
| Maximum Temperature | 140 Degrees Fahrenheit |
| Heat Output | 11 Kilowatts |
| Efficiency | 99.8 % |
| Mounting Type | Wall |
| Item Weight | 6.5 pounds |
| UPC | 854920002022 |
| First Available | March 19, 2010 |
Warranty and Support
Warranty Information
The EcoSmart ECO 11 Electric Tankless Water Heater comes with a Lifetime Warranty on electronics, exchanger, and element. Please note that the warranty only covers the cost of the heater and does not cover labor or any incidental damages.
Customer Support
For detailed instructions, troubleshooting, or further assistance, please refer to the official user manuals:
You can also visit the official EcoSmart Store on Amazon for more product information and support resources: EcoSmart Store
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