1. Introduction
Thank you for choosing the MIZUDO 3.5kW 120 Volt Electric Tankless Water Heater. This manual provides essential information for the safe installation, operation, and maintenance of your new water heater. Please read this manual thoroughly before installation and retain it for future reference.
This tankless water heater is designed to provide instant, on-demand hot water for single-point-of-use applications, such as handwashing or dish rinsing, and is not intended for whole-house or bathing purposes.
2. Important Safety Information
WARNING: Improper installation, adjustment, alteration, service, or maintenance can cause property damage, injury, or death. Read all instructions thoroughly before installation or use. This appliance must be installed by a qualified professional (electrician and plumber) in accordance with all local electrical and plumbing codes.
- Electrical Safety: The unit requires a dedicated 120V/30A circuit. A customer review highlighted a potential discrepancy regarding wiring. For a 3.5kW 120V unit, a 30A breaker typically requires 10 AWG wire. If a 40A breaker is used, 8 AWG wire is necessary. Ensure the electrical connection is a 120V circuit with one hot, one neutral, and one ground wire. Consult a qualified electrician to verify correct wiring and breaker sizing for your specific installation to prevent fire hazards and ensure safe operation.
- Water Pressure: Ensure water pressure is within the recommended range for optimal performance and to prevent damage.
- Leak Prevention: Regularly inspect for leaks. The unit features built-in leak detection.
- Overheating Protection: The unit includes overheating protection to prevent scalding.
- Isolated Systems: Fully isolated water and electrical systems enhance safety.
- Temperature Range: The adjustable temperature range is 80°F–113°F. Do not exceed recommended temperatures.
Figure 2.1: Comprehensive Safety Protection features of the MIZUDO Tankless Water Heater, including leak-proof, splash-proof, scald-proof, corrosion-resistant, pressure-resistant, and dry-burn protection.
3. Package Contents
Verify that all components are present and undamaged upon opening the package:
- MIZUDO 3.5kW 120 Volt Electric Tankless Water Heater x 1
- User Manual x 1
4. Product Overview
The MIZUDO 3.5kW Electric Tankless Water Heater provides hot water on demand, eliminating the need for a storage tank and reducing energy waste. Its compact design allows for installation in small spaces, such as under sinks or in cabinets. The unit features an LED digital display for clear temperature monitoring and adjustment.
Figure 4.1: Front view of the MIZUDO 3.5kW Electric Tankless Water Heater, highlighting its compact design and digital temperature display.
Figure 4.2: The compact dimensions of the MIZUDO water heater (8.07"W x 6.9"H x 2.5"D) are illustrated, demonstrating its space-saving design suitable for various installations.
Figure 4.3: Examples of the MIZUDO water heater installed in multiple scenarios, including bathroom, kitchen, and laundry areas, showcasing its versatility for point-of-use applications.
5. Installation
Installation must be performed by a qualified electrician and plumber. Ensure all local codes are followed.
5.1 Site Selection
- Install the unit vertically in a location protected from freezing temperatures.
- Choose a location close to the point of use to minimize heat loss and maximize efficiency.
- Ensure adequate clearance around the unit for maintenance and ventilation.
- The compact size makes it suitable for under-sink or cabinet installation.
5.2 Plumbing Connection
- Connect the water inlet and outlet using 1/2" NPT connections.
- Ensure all connections are watertight to prevent leaks.
- Install a shut-off valve on the cold water inlet line for maintenance.
- Flush the system thoroughly before connecting the electrical supply to remove any debris.
5.3 Electrical Connection
- The unit requires a dedicated 120V/30A circuit.
- Use 10 AWG wire for a 30A breaker. If a 40A breaker is used, 8 AWG wire is required.
- Connect the hot (L), neutral (N), and ground (G) wires as indicated in the diagram.
- Ensure the circuit breaker is OFF before making any electrical connections.
Figure 5.1: Detailed installation instructions, illustrating both plumbing connections (1/2" NPT) and electrical wiring for a 120V/30A circuit with a 10 AWG wire.
6. Operating Instructions
6.1 Power On/Off
- After successful installation and verification of water flow, turn on the circuit breaker.
- Press the power button on the unit's display to turn the heater on or off.
6.2 Temperature Adjustment
- Use the '+' and '-' buttons on the LED display to adjust the desired water temperature.
- The temperature can be set between 80°F and 113°F.
- The LED display will show the current temperature setting.
6.3 LED Display Indicators
- The digital display shows the current water temperature.
- Indicators for ECO mode, power status, and temperature units (°F/°C) are also present.
Figure 6.1: Demonstrates the instant hot water capability for various daily tasks, showing consistent temperatures for brushing teeth, washing dishes, and washing face.
7. Maintenance
Regular maintenance ensures optimal performance and extends the lifespan of your water heater.
- Exterior Cleaning: Clean the exterior of the unit with a soft, damp cloth. Do not use abrasive cleaners or solvents.
- Inlet Filter: Periodically check and clean the inlet water filter to prevent sediment buildup. Turn off the water supply and power before cleaning.
- Descaling: While tankless heaters are less prone to scale buildup than tank heaters, in areas with hard water, periodic descaling may be necessary. Consult a qualified plumber for descaling procedures.
- Leak Inspection: Regularly inspect all plumbing connections for any signs of leaks.
8. Troubleshooting
If you encounter issues, refer to the following table before contacting customer service.
| Problem | Possible Cause | Solution |
|---|---|---|
| No hot water / Unit not turning on | No power, circuit breaker tripped, water flow too low | Check circuit breaker, ensure unit is plugged in, verify adequate water flow. |
| Insufficient hot water temperature | Temperature setting too low, high inlet water temperature, excessive flow rate | Increase temperature setting, reduce water flow, refer to sizing chart for performance limits. |
| Water leaks | Loose connections, damaged seals | Tighten plumbing connections, inspect and replace seals if necessary. If leak persists, contact support. |
| Error code on display | Internal fault, sensor issue | Note the error code and contact MIZUDO customer service for assistance. |
9. Specifications
Technical specifications for the MIZUDO 3.5kW 120 Volt Electric Tankless Water Heater:
| Feature | Specification |
|---|---|
| Brand | MIZUDO |
| Model Number | 3.5kW |
| Power (Wattage) | 3.5 kW |
| Voltage | 120 Volts (AC) |
| Product Dimensions (W x H x D) | 8.07" x 6.9" x 2.5" |
| Item Weight | 4.6 pounds |
| Adjustable Temperature Range | 80°F–113°F |
| Mounting Type | Wall |
| Water Connection | 1/2" NPT |
| Circuit Requirement | Dedicated 30A breaker |
Figure 9.1: North America Ground Water Temperature Map and Sizing Chart. This chart helps determine the unit's performance (GPM) based on your local inlet water temperature when the outlet temperature is set to 104°F. Note that performance varies with inlet temperature and flow rate.
10. Warranty and Customer Support
The MIZUDO 3.5kW Electric Tankless Water Heater comes with a 12 Months Warranty from the date of purchase. This warranty covers defects in materials and workmanship under normal use.
For technical assistance, troubleshooting, or warranty claims, please contact MIZUDO customer service. Our 7/24 Customer Service team is available to assist you.
Contact Information: Please refer to the contact details provided on the product packaging or the official MIZUDO website for the most up-to-date support information.
11. Disposal
When the water heater reaches the end of its service life, please dispose of it responsibly according to local regulations. Do not dispose of electrical appliances with general household waste. Contact your local authorities for information on recycling and disposal options for electronic waste.
