Eemax EEM24018 Electric Tankless Water Heater User Manual

1. Introduction

This manual provides essential instructions for the safe and efficient installation, operation, and maintenance of your Eemax EEM24018 Electric Tankless Water Heater. Please read this manual thoroughly before installation and retain it for future reference.

The Eemax EEM24018 is designed to provide a continuous supply of hot water on demand, heating water only when needed. This unit features advanced self-modulating technology, which adjusts energy input based on hot water requirements for efficient operation. Its compact design saves space, and digital temperature control allows precise temperature settings from 80°F to 140°F in 1°F increments.

2. Important Safety Information

WARNING:

• Installation must be performed by a qualified electrician and plumber in accordance with all national, state, and local electrical and plumbing codes.
• Failure to follow these instructions can result in property damage, serious injury, or death.
• Ensure the main power supply to the unit is disconnected before performing any installation, maintenance, or service.
• This appliance must be properly grounded.
• Do not operate the water heater if it is damaged or malfunctioning.

3. Product Overview

The Eemax EEM24018 is an 18 kW, 240 Volt electric tankless water heater. It is designed for various applications, including whole-house, point-of-use, or as a tank booster.

Figure 3.1: Front view of the Eemax EEM24018 Electric Tankless Water Heater. The unit features a blue casing with a digital display and a control knob for temperature adjustment.

Key features include:

• Instant and Consistent Hot Water: Heats water on demand, eliminating standby heat loss.
• Self-Modulating Technology: Adjusts power consumption based on hot water demand.
• Compact Design: Saves space compared to traditional tank water heaters.
• Digital Temperature Control: Precise temperature setting from 80°F to 140°F.

Figure 3.2: Angled view of the Eemax EEM24018, showcasing its sleek blue design and digital interface.

Figure 3.3: Internal view of the Eemax EEM24018, showing copper heating elements, wiring, and control board.

4. Setup and Installation

Professional installation is strongly recommended for the Eemax EEM24018. Consult a qualified electrician and plumber prior to purchase and installation to ensure compliance with all local codes and proper sizing for your hot water needs.

4.1 Electrical Requirements

The EEM24018 requires specific electrical service. Verify that your electrical panel can accommodate these requirements.

• Voltage: 240 Volts
• Wattage: 18 KW
• Amperage: 75 Amps (Max Draw)
• Breakers: Two (2) 40 Amp Double Pole Breakers are required.
• Wire Gauge: (2) 8 AWG wire is recommended.

Figure 4.1: Diagram illustrating the electrical connections for the Eemax EEM24018, showing the required wiring and breaker setup within a household service panel.

Figure 4.2: A clear summary indicating the EEM24018 requires 75 Amps power, 2 double pole breakers, and 40 Amp breakers.

4.2 Plumbing Requirements

The unit requires a minimum rated pressure of 25 psi and a maximum of 150 psi. It is recommended to install shut-off valves on both the inlet and outlet lines, along with a main shut-off valve for the water supply to the heater, to facilitate future maintenance.

4.3 Installation Location and Application

The EEM24018 can be installed in various configurations depending on your hot water needs.

• Whole House: Provides hot water to your entire home.
• Point-of-Use (POU): Provides a small amount of hot water to an isolated location, such as a single sink.
• Tank Booster: Can be used to nearly double the output of an existing gas or electric tank water heater.

Figure 4.3: Illustrative diagram showing typical installation points for Eemax tankless water heaters within a house, including whole-house, point-of-use, and tank booster applications.

4.4 Sizing and Performance

The performance of a tankless water heater is influenced by the inlet water temperature and desired output temperature. The EEM24018 has a water consumption rate of 3.5 Gallons per Minute (GPM).

Figure 4.4: Chart detailing the approximate usage (GPM) of the EEM24018 at various inlet water temperatures, based on an outlet temperature of 105°F. This helps determine suitability for different climates and usage scenarios.

5. Operating Instructions

The Eemax EEM24018 features a digital display and a control knob for easy operation.

5.1 Power On/Off

To turn the unit on or off, press and hold the control knob for approximately 3 seconds. The digital display will illuminate when the unit is powered on.

5.2 Setting Temperature

Rotate the control knob to adjust the desired water temperature. The digital display will show the set temperature. Temperatures can be set in 1°F increments, ranging from 80°F to 140°F.

5.3 Temperature Unit Selection (°C/°F)

The unit allows selection between Fahrenheit (°F) and Celsius (°C). Refer to the specific instructions near the control knob for changing this setting, typically by a short press or combination of presses.

6. Maintenance

Regular maintenance ensures optimal performance and longevity of your tankless water heater. It is recommended to perform maintenance annually, or more frequently in areas with hard water.

6.1 Flushing the Unit

To prevent mineral buildup and maintain efficiency, the unit should be flushed with a descaling solution (such as vinegar or CLR) at least twice annually. This process helps clean the internal heating coils.

1. Turn off the power supply to the water heater at the circuit breaker.
2. Close the inlet and outlet water valves to the unit.
3. Connect a descaling pump and hoses to the service ports (if installed) or directly to the inlet/outlet connections.
4. Circulate the descaling solution through the unit for the recommended duration (refer to descaling solution instructions).
5. Flush the unit thoroughly with fresh water.
6. Reconnect plumbing, open water valves, and restore power.

Consider installing an inline water filter to reduce mineral deposits, especially in hard water areas.

7. Troubleshooting

This section provides solutions to common issues you may encounter with your Eemax EEM24018 water heater.

7.1 No Hot Water or Insufficient Hot Water

• Check Power: Ensure the unit is powered on and circuit breakers are not tripped.
• Temperature Setting: Verify the desired temperature is set correctly on the digital display.
• Water Flow: Ensure adequate water flow. Low flow rates can prevent the heater from activating or reaching the set temperature.
• Inlet Water Temperature: In colder climates, very low inlet water temperatures may reduce the maximum achievable flow rate at the desired output temperature. Refer to the sizing chart (Figure 4.4).
• Mineral Buildup: Excessive mineral buildup can restrict flow and heating efficiency. Perform a descaling flush (see Section 6.1).

7.2 Error Codes

The digital display may show error codes indicating a problem. For example, "H 103" has been reported as an error code. If an error code appears, first try resetting the unit by turning off the power at the breaker for a few minutes, then restoring power. If the error persists, consult a qualified technician or contact Eemax customer support.

7.3 Temperature Fluctuations

• Water Pressure: Inconsistent water pressure can cause temperature fluctuations. Ensure stable water pressure to the unit.
• Multiple Fixtures: If multiple hot water fixtures are used simultaneously, the unit may struggle to maintain a consistent temperature if demand exceeds its capacity.

8. Specifications

9. Warranty and Support

The Eemax EEM24018 Electric Tankless Water Heater comes with a manufacturer's warranty:

• Leaks: 5 years
• Parts: 1 year

For technical assistance, warranty claims, or further information, please contact Eemax customer support. Refer to the official Eemax website or product packaging for the most current contact details.