Introduction
This manual provides essential information for the safe and efficient operation of your Nessxa 4 Gallon Electric Mini Tank Water Heater. Please read all instructions carefully before installation and use. Retain this manual for future reference.
Important Safety Information
WARNING: Failure to follow these safety instructions could result in property damage, serious injury, or death.
- Professional Installation Recommended: Installation of this water heater requires plumbing and electrical knowledge. It is strongly recommended that a qualified professional perform the installation to ensure safety and proper function.
- Electrical Safety: Ensure the unit is connected to a properly grounded 110V, 1500W electrical supply. Do not use extension cords. Disconnect power before performing any maintenance or service.
- Water Pressure: Do not operate the unit if water pressure exceeds recommended limits. A pressure relief valve is included and must be installed.
- Scalding Hazard: Hot water can cause severe burns. Exercise caution when setting the temperature and using hot water.
- Leakage Protection: The unit features leakage protection. Regularly inspect for any signs of leaks.
- Overheat Protection: The water heater is equipped with overheat protection. If the unit overheats, it will shut down automatically.
- Dry Combustion Protection: Do not operate the unit without water inside the tank.
- Water and Electricity Separation: The internal design separates water and electrical components for enhanced safety.
Package Contents
Verify that all components are present before beginning installation:
- Nessxa 4 Gallon Electric Mini Tank Water Heater
- Instruction Manual (this document)
- Colloidal particle (quantity: 1)
- Drain hose (quantity: 1)
- Hook screws (quantity: 2)
- Sealing washers (quantity: 2)
Product Overview
The Nessxa 4 Gallon Electric Mini Tank Water Heater is designed to provide instant hot water at the point of use, reducing wait times and water waste. It features a compact design suitable for various installations.

Image: Nessxa Mini Tank Water Heater highlighting multi-protection features including IPX4 waterproof rating, water and electricity separation, overheat protection, anti-high voltage protection, and sensitive leakage protection.

Image: Close-up of the Nessxa water heater showing the user-friendly details: an LED display for easy water temperature viewing and a temperature adjustment knob for comfortable experience.
Setup and Installation
This water heater can be installed in various locations due to its compact design. It supports both wall-mounted and floor-mounted configurations.

Image: Illustration of multiple installation options for the Nessxa water heater, showing it wall-mounted next to a sink and floor-mounted under a counter.
Installation Steps:
- Choose Location: Select a suitable location under a sink or counter, or on a wall, ensuring adequate space and proximity to water lines and an electrical outlet. Refer to product dimensions for planning.
- Mounting: Securely mount the unit using the provided hook screws for wall installation, or place it on a stable, level surface for floor installation.
- Plumbing Connections: Connect the cold water inlet and hot water outlet lines to the corresponding ports on the water heater. Ensure all connections are tight and use the provided sealing washers to prevent leaks. Install the pressure relief valve as per local codes and manufacturer instructions.
- Fill Tank: Before connecting power, open a hot water faucet in your sink to allow air to escape and the tank to fill completely with water. Once water flows steadily from the faucet, close the faucet.
- Electrical Connection: Plug the water heater into a dedicated 110V, 1500W grounded electrical outlet.

Image: Diagram showing the product dimensions of the Nessxa 4 Gallon Electric Mini Tank Water Heater, which are approximately 10.2 inches wide, 10.2 inches deep, and 21.2 inches high. Key specifications like capacity (4 Gallons), amperage (10A), waterproof rating (IPX4), voltage (110V), pressure (0.8MPa), and power (1500W) are also listed.
Operating Instructions
Once installed and filled with water, your Nessxa water heater is ready for operation.
- Power On: Ensure the unit is plugged in and the electrical supply is active. The LED display will illuminate.
- Temperature Adjustment: Rotate the knob on the front panel to set your desired water temperature. The adjustable range is 77°F - 176°F (25°C - 80°C). The LED display will show the current water temperature.
- Heating Indicator: The unit will begin heating the water to the set temperature. A heating indicator (if present on the display) will show when the unit is actively heating.
- Standby Mode: When the water temperature reaches the set point, the heater will enter standby mode to conserve energy. If the water temperature drops below 77°F (25°C), the unit will automatically reactivate to maintain the set temperature.
- Instant Hot Water: The unit provides hot water on demand, reducing the wait time at your faucet.
Maintenance
Regular maintenance helps ensure the longevity and efficiency of your water heater.
- Descaling: Over time, mineral deposits can accumulate on the heating elements. It is recommended to descale the heating rods annually. Consult a qualified professional for descaling procedures if you are unsure.
- Draining the Unit: If the unit will not be used for an extended period or if there is a risk of freezing, it should be drained. While some units have a drain plug, this model may require professional assistance for complete draining. Always disconnect power before draining.
- Regular Inspection: Periodically check the unit for any signs of leaks, corrosion, or damage to the power cord. Address any issues promptly.
- Clean Exterior: Wipe the exterior of the unit with a soft, damp cloth. Do not use abrasive cleaners or solvents.
Troubleshooting
If you encounter issues with your water heater, refer to the following common problems and solutions:
| Problem | Possible Cause | Solution |
|---|---|---|
| No hot water | No power; thermostat set too low; overheat protection activated. | Check power connection and circuit breaker. Adjust thermostat. If overheat protection activated, allow unit to cool and reset if possible (consult professional if issue persists). |
| Insufficient hot water | Thermostat set too low; high hot water demand; mineral buildup. | Increase thermostat setting. Allow time for recovery between uses. Consider professional descaling. |
| Water leaking from unit | Loose plumbing connections; faulty pressure relief valve; tank leak. | Tighten connections. Check pressure relief valve. If tank leak suspected, immediately disconnect power and water supply and contact a professional. |
| Water not heating quickly | Low voltage; mineral buildup. | Ensure proper 110V supply. Consider professional descaling. |
If troubleshooting steps do not resolve the issue, contact customer support or a qualified technician.
Specifications
- Brand: Nessxa
- Model Number: YYJ24039-3
- Capacity: 4 Gallons
- Voltage: 110 Volts
- Wattage/Heat Output: 1500 Watts
- Maximum Temperature: 176°F (80°C)
- Temperature Adjustment Range: 77°F - 176°F (25°C - 80°C)
- Product Dimensions: 16.4"W x 11.8"H (Note: Image shows 10.2"x10.2"x21.2" which might be a different measurement or orientation)
- Item Weight: 22 pounds
- Mounting Type: Wall, Floor
- Special Features: Dry Combustion Protection, High Water Pressure Protection, Leakage Protection, Overheat Protection
- Material: ABS exterior, Stainless Steel internal tank body
Warranty and Support
Your Nessxa 4 Gallon Electric Mini Tank Water Heater comes with a manufacturer's warranty. Please refer to the warranty card or documentation included with your purchase for specific terms, conditions, and duration.
For technical support, troubleshooting assistance, or warranty claims, please contact Nessxa customer service through the retailer where the product was purchased or refer to the contact information provided in your product packaging.





