1. Introduction
This manual provides essential information for the safe and efficient installation, operation, and maintenance of your Rheem RTEX-13 Residential Tankless Water Heater. Please read this manual thoroughly before attempting to install or operate the unit. Retain this manual for future reference.
2. Important Safety Information
WARNING: This product can expose you to chemicals including lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
Installation of this appliance requires specialized knowledge and skills. It is strongly recommended that installation be performed by a qualified professional electrician and plumber to ensure compliance with all local codes and safety standards.
Electrical Requirements: The Rheem RTEX-13 requires a 240V electrical supply, drawing 54 Amps, and necessitates a 60 Amp double-pole breaker. Ensure your electrical panel can accommodate these requirements before installation.
Figure 2.1: Electrical power requirements for the Rheem RTEX-13 tankless water heater. This unit requires a dedicated 240V circuit with a 60 Amp double-pole breaker and draws 54 Amps.
- Always disconnect power to the unit before performing any service or maintenance.
- Do not operate the water heater if it is damaged or malfunctioning.
- Ensure proper grounding of the appliance.
- Keep flammable materials away from the water heater.
3. Product Overview
The Rheem RTEX-13 is a professional classic series tankless electric water heater designed to provide continuous hot water on demand for single point-of-use or multiple applications. Its compact design allows for flexible installation in various spaces.
Figure 3.1: Front view of the Rheem RTEX-13 tankless water heater, showcasing its digital LED display and temperature control knob.
Key Features:
- Digital Thermostatic Control: External adjustable digital thermostatic control with LED display, offering +/- 1 degree accuracy.
- Durable Heating Elements: Features durable copper immersion heating elements that are field serviceable.
- Self-Modulating Power Control: Automatically adjusts power consumption based on hot water demand, enhancing energy efficiency.
- Simple Installation: Designed for straightforward installation with 1/2 NPT adapters included and side 1/2 inch compression water connections.
- High Energy Efficiency: Achieves 99.8% energy efficiency, minimizing energy waste.
- Adjustable Temperature: External controls allow temperature adjustment in increments of 1°F.
- Flow Rate: Provides a flow rate of up to 3.17 GPM (Gallons Per Minute) for the 13kW model, suitable for various applications.
Figure 3.2: Dimensions of the Rheem RTEX-13 tankless water heater, illustrating its compact size for easy integration into various spaces.
Figure 3.3: Internal components of the Rheem RTEX-13, highlighting the heating elements, wiring, and control board.
4. Setup and Installation
Proper installation is crucial for the safe and efficient operation of your tankless water heater. Refer to the comprehensive Installation Manual (PDF) for detailed step-by-step instructions, diagrams, and safety warnings.
Key Installation Considerations:
- Location: Choose a location that is protected from freezing temperatures and is easily accessible for maintenance.
- Mounting: The unit is designed for wall mounting. Ensure the mounting surface is sturdy enough to support the unit's weight.
- Plumbing Connections: Connect the 1/2 inch NPT water lines to the designated inlet and outlet ports. Ensure all connections are secure and leak-free.
- Electrical Wiring: This unit requires a dedicated 240V, 60 Amp circuit. All electrical work must comply with local and national electrical codes. It is highly recommended to have a licensed electrician perform the electrical hookup.
- Initial Startup: Before powering on, ensure the unit is completely filled with water to prevent damage to the heating elements.
5. Operating Instructions
The Rheem RTEX-13 is designed for user-friendly operation with its intuitive digital controls.
Setting the Temperature:
- Ensure the unit is powered on and water is flowing through the system.
- Locate the digital LED display and the temperature adjustment knob on the front of the unit.
- Turn the knob clockwise to increase the desired temperature and counter-clockwise to decrease it. The display will show the set temperature in 1°F increments.
- The unit will automatically heat the water to the set temperature as water flows through it.
The self-modulating power control ensures that the unit only uses the necessary amount of energy to heat the water to your desired temperature, providing efficient and continuous hot water.
6. Maintenance
Regular maintenance is essential to ensure the longevity and optimal performance of your Rheem RTEX-13 tankless water heater. Refer to the User Manual (PDF) for detailed maintenance procedures.
Recommended Maintenance:
- Flushing/Descaling: Depending on your water quality, it is recommended to flush and descale the unit annually to prevent mineral buildup, which can affect performance and efficiency. This process typically involves circulating a descaling solution through the unit.
- Inlet Filter Cleaning: Periodically check and clean the inlet water filter to ensure unrestricted water flow.
- Visual Inspection: Regularly inspect the unit for any signs of leaks, corrosion, or damage to the wiring and connections.
Note: If you are unsure about performing any maintenance tasks, it is advisable to contact a qualified service technician.
7. Troubleshooting
This section provides guidance for common issues you might encounter with your Rheem RTEX-13 tankless water heater. For more complex problems or issues not listed here, consult the full User Manual (PDF) or contact Rheem customer support.
| Problem | Possible Cause | Solution |
|---|---|---|
| No hot water / Unit not turning on | No power; tripped breaker; insufficient water flow. | Check electrical supply and breaker. Ensure adequate water flow (minimum activation flow rate). |
| Inconsistent water temperature | Fluctuating water flow; mineral buildup; incorrect temperature setting. | Maintain consistent water flow. Perform descaling maintenance. Adjust temperature setting. |
| Reduced water pressure | Clogged inlet filter; mineral buildup in pipes or unit. | Clean inlet filter. Perform descaling. |
| Error code on display | Internal malfunction; sensor issue. | Refer to the full user manual for specific error code meanings and solutions. Contact Rheem support if necessary. |
8. Technical Specifications
Below are the key technical specifications for the Rheem RTEX-13 Residential Tankless Water Heater:
| Feature | Detail |
|---|---|
| Brand | Rheem |
| Model Number | RTEX-13 |
| Product Dimensions | 1"W x 1"H (Note: This seems to be a placeholder, actual dimensions are 8.25"W x 12.625"H x 3.625"D from image) |
| Color | Gray |
| Wattage | 13 KW |
| Voltage | 240 Volts |
| Maximum Flow Rate | 4.8 Gallons Per Minute (GPM) |
| Maximum Temperature | 140 Degrees Fahrenheit |
| Efficiency | At least 99.8% energy efficient |
| Mounting Type | Wall |
| Item Weight | 3.96 pounds |
| UPC | 020352685328 |
Note: The "Product Dimensions" listed in some specifications might be generic. Refer to Figure 3.2 for precise physical dimensions of the unit.
Figure 8.1: Selection guide illustrating approximate usage (GPM) for different RTEX models based on inlet water temperature and geographic location. The RTEX-13 model's performance varies with inlet water temperature.
9. Warranty and Support
Rheem products are backed by a manufacturer's warranty. Specific warranty terms and conditions, including coverage duration for parts and labor, are typically provided with the product documentation or can be found on the official Rheem website. It is important to register your product upon purchase to ensure full warranty coverage.
For technical assistance, troubleshooting beyond this manual, or warranty claims, please contact Rheem customer support directly. Have your model number (RTEX-13) and serial number ready when contacting support.
Online Resources: For additional information, FAQs, and support, visit the official Rheem website or refer to the User Manual (PDF) and Installation Manual (PDF) available online.