1. Introduction
This manual provides essential information for the safe and efficient operation, installation, and maintenance of your MIZUDO 11kW 240V Electric Tankless Water Heater. Please read it thoroughly before installation and use, and keep it for future reference.
Figure 1: MIZUDO 11kW 240V Electric Tankless Water Heater
Video 1: MIZUDO Electric Tankless Water Heater Overview. This video highlights the main features and benefits of the MIZUDO tankless water heater.
2. Important Safety Information
Failure to follow these instructions could result in property damage, serious injury, or death. This appliance must be installed by a qualified electrician and plumber in accordance with all local and national codes.
2.1 Safety Features
- ETL Certified: Ensures compliance with North American safety standards.
- Leakage Protection: Designed to prevent water leaks.
- Over-temperature Protection: Automatically shuts off if water temperature exceeds safe limits.
- Dry-heating Protection: Prevents damage if the unit operates without water.
- IPX4 Waterproof: Provides protection against splashing water.
- Scald Prevention: Helps maintain stable output temperature to prevent scalding.
- Flame-retardant Shell: Constructed with materials resistant to fire.
- Low Flow Protection: Ensures proper operation and safety under low water flow conditions.
- Voltage Protection: Safeguards against electrical voltage fluctuations.
Figure 2: ETL Certified with 6-Stage Safety
3. Product Features
The MIZUDO 11kW Tankless Water Heater offers advanced technology for efficient and reliable hot water supply.
- Instant Heating: Heats water in approximately 3 seconds, providing on-demand hot water.
- High Energy Efficiency: Boasts 98% thermal efficiency, reducing electricity costs by up to 60% compared to traditional tank heaters.
- Flow Rate: Delivers up to 2.6 GPM (Gallons Per Minute), suitable for 1-2 points of use simultaneously.
- Stable Temperature Control: A smart system fine-tunes heating power 20,000 times per second to maintain temperature within ±1°F.
- Compact Design: Measures 14.2"H x 9.5"L x 2.8"W, saving over 50% space compared to tank-style heaters.
- LED Digital Display: Allows easy temperature setting between 86°F and 140°F.
Figure 3: Key Features of the MIZUDO Tankless Water Heater
Figure 4: Internal Components and Performance
Figure 5: Stable Constant Temperature for a Comfortable Experience
Figure 6: Endless Hot Water on Demand for Multiple Uses
4. Technical Specifications
| Specification | Value |
|---|---|
| Brand | MIZUDO |
| Model Number | 11kW |
| Power Source | Hard Wiring Required |
| Product Dimensions | 9.5"W x 14.2"H x 2.8"D |
| Color | White |
| Wattage | 11 KW |
| Voltage | 240 Volts (AC) |
| Mounting Type | Wall |
| Item Weight | 11.62 pounds |
| Circuit Breaker Requirement | 1 x 50 Amp Two-Pole Breaker |
| Wire Size Requirement | 1 x 8 AWG |
| Water Connections | 1/2" NPT |
| Operating Pressure | Max. 150 PSI |
| Waterproof Rating | IPX4 |
Figure 7: Product Parameters and Installation Guide
Figure 8: North America Ground Water Temperature Map and Usage Guide
5. Installation Guide
Proper installation is crucial for the safe and efficient operation of your MIZUDO tankless water heater. It is highly recommended that installation be performed by a qualified professional.
5.1 Pre-Installation Checklist
- Ensure you have a 50 AMP two-pole breaker and 8 AWG wires.
- Verify 1/2" NPT water connections are available.
- Confirm the installation location is suitable, considering the unit's compact size (14.2"H x 9.5"L x 2.8"W).
- Turn off all power to the installation area at the main breaker panel.
5.2 Installation Steps (Refer to Video)
For a detailed visual guide, please watch the official installation video below. The video covers unboxing, mounting, water connections, and electrical connections.
Video 2: Installation of MIZUDO 11kW Electric Tankless Water Heater. This video provides a step-by-step guide for unboxing, mounting the unit, connecting water lines, and making electrical connections to ensure proper setup.
- Unboxing: Carefully open the package and remove the water heater and accessories.
- Mounting: Use the provided template to mark and drill holes. Insert wall anchors and partially fasten screws. Hang the unit and secure it by tightening the screws.
- Water Connections: Connect the inlet and outlet water pipes (1/2" NPT) to the unit. Ensure sealing rings are properly placed and connections are tight.
- Electrical Connections: CAUTION: Ensure power is OFF before connecting wires. Connect the 8 AWG wires to the appropriate terminals (L1, L2, Ground) within the unit and to the 50 Amp two-pole breaker in your electrical panel.
- Water Line Air Purge: Before powering on, open a hot water faucet to purge all air from the water lines. This prevents dry-heating damage.
- Power On: Once water lines are purged and all connections are secure, turn on the circuit breaker.
6. Operation
Your MIZUDO tankless water heater features an intuitive LED digital display for easy temperature control.
Figure 9: Digital Display & Touch Control Panel
- Power On/Off: Press the power button (usually indicated by a circle with a vertical line) on the touch display to turn the unit on or off.
- Set Temperature: Use the up and down arrow buttons on the display to adjust your desired water temperature. The temperature range is typically 86°F to 140°F.
- Temperature Unit Conversion: If available, press the F/C button to switch between Fahrenheit and Celsius display.
- Water Flow Signal: The display may show a water flow signal when hot water is being drawn, indicating active heating.
The unit will automatically heat water to your set temperature as soon as water flow is detected.
7. Maintenance
Regular maintenance ensures the longevity and optimal performance of your tankless water heater.
- Descaling: Depending on your water hardness, periodic descaling (flushing with a descaling solution) may be necessary to prevent mineral buildup. Consult a professional for this service.
- Filter Screen Cleaning: Check and clean the inlet filter screen periodically to ensure unrestricted water flow.
- External Cleaning: Wipe the exterior of the unit with a soft, damp cloth. Do not use abrasive cleaners.
- Safety Thermal Cut-off Reset: If the unit stops working due to a safety thermal cut-off, follow the instructions below to reset it.
7.1 Safety Thermal Cut-off Reset Instructions
Warning: Please ensure to operate under power-off conditions.
- Remove the outer shell: Carefully detach the front cover of the water heater.
- Locate the safety thermal cut-off: Identify the reset button, typically a small red button, on the internal components.
- Press the reset button with a screwdriver: Gently press the button until it clicks.
- Install the outer shell: Reattach the front cover securely.
To determine if the safety thermal cut-off has tripped, check if the display screen shows nothing, if the municipal power supply is normal (test other appliances), and if the circuit breaker connected to the water heater has not tripped. If these conditions are met, the product limiter may have tripped.
Figure 10: Safety Thermal Cut-off Reset Procedure
8. Troubleshooting
If you encounter issues with your MIZUDO tankless water heater, refer to the common problems and solutions below. For persistent issues, contact customer support.
| Problem | Possible Cause | Solution |
|---|---|---|
| No hot water / Unit not turning on | No power, tripped circuit breaker, safety thermal cut-off tripped, no water flow. | Check power supply. Reset circuit breaker. Refer to Section 7.1 Safety Thermal Cut-off Reset Instructions. Ensure water supply is on and flowing. |
| Water not hot enough / Fluctuating temperature | Inlet water temperature too low, excessive flow rate, mineral buildup, incorrect temperature setting. | Adjust temperature setting higher. Reduce water flow at the faucet. Consider professional descaling. Refer to Figure 8 for GPM vs. inlet temperature. |
| Water leakage | Loose connections, damaged pipes or seals. | Turn off water supply and power immediately. Check all water connections for tightness. Inspect pipes and seals for damage. Contact a qualified plumber. |
| Error code on display | Internal fault or sensor issue. | Note the error code and consult the full user manual (if provided separately) or contact MIZUDO customer support. |
9. Warranty and Support
MIZUDO provides long-term return & exchange services along with professional technical consulting support for your product.
For warranty claims, technical assistance, or any questions regarding your MIZUDO 11kW Electric Tankless Water Heater, please contact MIZUDO customer service through the retailer where you purchased the product or visit the official MIZUDO website for contact information.
MIZUDO Store: Visit the MIZUDO Store on Amazon
