Introduction
This manual provides essential instructions for the safe and efficient installation, operation, and maintenance of your Richmond RMTEX-27 Essential Tankless Electric Water Heater. Please read this manual thoroughly before installation and use, and retain it for future reference.
The Richmond RMTEX-27 is designed to provide on-demand, continuous hot water. It features a compact design, digital temperature control from 80°F to 140°F, and 99.8% energy efficiency. Robust copper immersion heating elements with brass tops are threaded for easy replacement.
Safety Information
WARNING: Improper installation, adjustment, alteration, service, or maintenance can cause property damage, injury, or death. Read the installation, operating, and maintenance instructions thoroughly before installing or servicing this equipment.
- Ensure all electrical connections are made by a qualified electrician in accordance with local and national electrical codes.
- Ensure proper grounding to prevent electrical shock.
- Do not operate the water heater if any part has been submerged in water.
- This appliance is not intended for use by persons (including children) with reduced physical, sensory or mental capabilities, or lack of experience and knowledge, unless they have been given supervision or instruction concerning use of the appliance by a person responsible for their safety.
Setup and Installation
Installation should be performed by a qualified professional. Refer to the complete installation guide provided with the product for detailed instructions.
Location Requirements:
- Install indoors only.
- Choose a location protected from freezing temperatures.
- Ensure adequate clearance for servicing and maintenance.
- Mount the unit vertically on a solid surface.
Plumbing Connections:
- Connect to 3/4" NPT water lines.
- Install shut-off valves on both hot and cold water lines.
- Flush the system thoroughly before connecting the heater to remove debris.
Electrical Connections:
- This unit requires 240V electrical service.
- Ensure dedicated circuit breakers are installed as per local codes.
- Connect wiring according to the diagram provided inside the unit's cover.
Figure 1: Front view of the Richmond RMTEX-27 Tankless Electric Water Heater, showing the digital temperature display set to 105°F and the control knob.
Operating Instructions
Initial Startup:
- Ensure all plumbing connections are secure and leak-free.
- Open all hot water faucets in the house to purge air from the system. Allow water to flow for several minutes until a steady stream is observed from all faucets.
- Close all hot water faucets.
- Turn on the electrical power to the unit at the circuit breaker.
- The digital display will illuminate, showing the current temperature or a default setting.
Temperature Adjustment:
- The RMTEX-27 features a digital temperature control.
- Use the control knob on the front panel to adjust the desired water temperature.
- The temperature can be set in 1°F increments, ranging from 80°F to 140°F.
- The digital display will show the set temperature.
Figure 2: Detail of the digital temperature display and control knob on the Richmond RMTEX-27, indicating temperature adjustment functionality.
Maintenance
Regular maintenance ensures optimal performance and longevity of your tankless water heater.
Annual Flushing:
- To prevent mineral buildup, it is recommended to flush the unit annually with a descaling solution.
- Consult a qualified plumber for this procedure, especially in areas with hard water.
Element Inspection:
- The copper immersion heating elements are threaded for easy replacement.
- Inspect elements periodically for signs of wear or corrosion. Replacement should be done by a qualified technician.
Cleaning:
- Wipe the exterior of the unit with a soft, damp cloth. Do not use abrasive cleaners or solvents.
Troubleshooting
Before contacting customer service, review the following common issues and solutions:
| Problem | Possible Cause | Solution |
|---|---|---|
| No hot water / Unit not turning on | No power, tripped breaker, water flow too low | Check circuit breaker. Ensure adequate water flow (minimum activation flow rate). |
| Inconsistent water temperature | Fluctuating water pressure, mineral buildup, incorrect temperature setting | Check water pressure. Perform descaling. Adjust temperature setting. |
| Water is not hot enough | Temperature set too low, high incoming water temperature, multiple hot water demands | Increase temperature setting. Reduce simultaneous hot water usage. |
| Error code on display | Internal fault, sensor issue | Refer to the full manual for specific error code definitions or contact customer support. |
Specifications
| Feature | Specification |
|---|---|
| Model | RMTEX-27 |
| Brand | Richmond (Rheem) |
| Wattage | 27 KW |
| Voltage | 240 Volts (AC) (Note: Product data listed 1800 Volts DC, which is atypical for this appliance type. 240V AC is assumed based on wattage and common tankless heater specifications.) |
| Maximum Flow Rate | 6.6 Gallons Per Minute |
| Temperature Range | 80°F to 140°F |
| Efficiency | 99.8% Energy Efficient |
| Connections | 3/4" NPT |
| Dimensions (L x W x H) | 19.75 x 17.8 x 6.75 inches |
| Item Weight | 19.14 pounds |
| Installation Type | Indoor Installation |
Warranty and Support
For warranty information and technical support, please refer to the documentation included with your product or visit the official Richmond/Rheem website. Keep your proof of purchase for warranty claims.
Manufacturer: RHEEM / RICHMOND
UPC: 020352682976
Model Number: 682976 (Internal Item Model Number)
