Introduction
This manual provides essential information for the safe and efficient installation, operation, and maintenance of your Rheem Prestige RTGH-84XLP-2 Condensing Tankless Outdoor Liquid Propane Water Heater. Please read all instructions carefully before proceeding with installation or operation. Proper installation and maintenance are crucial for optimal performance and to ensure warranty validity.
Safety Information
WARNING: Improper installation, adjustment, alteration, service, or maintenance can cause property damage, injury, or death. Refer to this manual. For assistance or additional information, consult a qualified installer, service agency, or the gas supplier.
- Professional Installation Required: This unit requires professional installation. Failure to use a qualified installer will void the product warranty.
- Gas and Water Connections: Ensure all gas and water connections are properly sealed and tested for leaks by a qualified professional.
- Overheat Protection: The unit is equipped with a Guardian Overheat Film Wrap designed to prevent dangerous temperatures. Do not tamper with this safety feature.
- Low NOx Burner: The Ultra Low NOx burner meets SCAQMD rule requirements for safety and low emissions.
- Leak Detection: The integrated Water & Gas Leak Detection system will automatically shut down the unit and provide an error code if a leak is detected.
- Outdoor Use Only: This model is designed exclusively for outdoor installation. Do not install indoors.
Setup and Installation
The Rheem Prestige RTGH-84XLP-2 is designed for outdoor wall-mount installation. Professional installation is mandatory to ensure safety and warranty coverage.
Figure 1: Example of outdoor installation for the Rheem tankless water heater.
Pre-Installation Checklist for Tankless Gas Water Heaters
- ✓ Inlet & Exhaust Connections: Confirm required connection sizes and materials.
- ✓ Vent Run: Determine the maximum allowed length for the vent run.
- ✓ Temperature Delivery: Verify the unit can deliver your required water temperature based on your region's inlet water temperature.
- ✓ Installed Unit Clearance: Ensure adequate clearance for installation and servicing.
Replacing a Gas Tank with a Tankless Gas Checklist
- ✓ Venting: Existing exhaust venting from a tank water heater may not be suitable. Condensing tankless units typically use PVC and Non-Condensing stainless steel exhaust venting.
- ✓ Main Gas Line: A 3/4-inch natural gas line is recommended for optimal performance compared to a 1/2-inch line.
- ✓ Electricity: Tankless gas water heaters require an electrical power supply, which your old tank unit may not have needed.
- ✓ Piping: Inlet and outlet piping may require alterations to connect the tankless gas water heater.
Operating Instructions
The Rheem Prestige RTGH-84XLP-2 provides continuous hot water on demand. The unit features a digital remote control for temperature adjustment and monitoring.
- Activation: The unit has an industry-leading low flow activation with a minimum flow rate of 0.26 GPM and a minimum activation flow rate of 0.40 GPM, ensuring hot water even in low demand situations.
- Temperature Control: Use the included digital remote control to set your desired hot water temperature. The remote comes with 10 feet of thermostat wire for flexible placement.
- Smart Home Integration: The unit is EcoNet enabled, allowing for smart home connectivity and control with an additional kit (sold separately).
Performance Guide (RTGH-2 Series)
The following table provides estimated water flow rates (GPM) at various temperature rises (°F) for sizing purposes only.
Figure 2: Performance Guide for RTGH-2 Series models, including RTGH-84.
| Model Number | Temperature Rise (°F) | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| 35° | 45° | 50° | 60° | 67° | 70° | 80° | 90° | 100° | |
| RTGH-95 | 9.5 | 8.5 | 7.7 | 6.4 | 5.7 | 5.5 | 4.8 | 4.3 | 3.8 |
| RTGH-90 | 9.0 | 7.7 | 6.9 | 5.8 | 5.2 | 4.9 | 4.3 | 3.8 | 3.5 |
| RTGH-84 | 8.4 | 6.7 | 6.0 | 5.0 | 4.6 | 4.3 | 3.8 | 3.3 | 3.0 |
| RTGH-68 | 6.6 | 5.1 | 4.6 | 3.8 | 3.4 | 3.3 | 2.9 | 2.6 | 2.3 |
Note: These estimates are for sizing purposes only. Actual performance may vary.
Maintenance
Regular maintenance ensures the longevity and efficiency of your Rheem tankless water heater. The unit is designed with features to assist in maintenance.
- Maintenance Notifications: The unit includes settings for maintenance notifications to remind you when service is due.
- Self-Diagnostic System: A self-diagnostic system helps identify potential issues, often displaying error codes on the digital remote control.
- Condensate Neutralizer: A built-in condensate neutralizer is included, which requires periodic inspection and potential replacement of the neutralizing media. Consult your installer or service manual for specific intervals.
- Freeze Protection: The unit offers freeze protection down to -30 degrees Fahrenheit, suitable for outdoor installations in cold climates.
- Annual Servicing: It is recommended to have the unit inspected and serviced annually by a qualified technician to ensure proper operation and prevent scale buildup.
Figure 3: Internal components of the Rheem tankless water heater.
Troubleshooting
The Rheem RTGH-84XLP-2 is equipped with a self-diagnostic system to help identify and resolve common issues. If an error occurs, an error code will typically be displayed on the digital remote control.
- Error Codes: Refer to the full installation and operation manual for a comprehensive list of error codes and their corresponding troubleshooting steps.
- Water & Gas Leak Detection: If the unit shuts down due to a detected water or gas leak, immediately contact a qualified service technician. Do not attempt to operate the unit until the issue is resolved and inspected by a professional.
- No Hot Water: Check the gas supply, water flow, and power supply to the unit. Ensure the remote control is set to the desired temperature.
- Low Hot Water Flow: Verify that the minimum flow rate requirements are met. Check for any restrictions in water lines or aerators.
For complex issues or persistent problems, contact a qualified Rheem service technician.
Specifications
| Feature | Detail |
|---|---|
| Brand | Rheem |
| Model Number | RTGH-84XLP-2 |
| Power Source | Liquid Propane |
| Capacity | 8.4 GPM (Gallons Per Minute) |
| Efficiency | 0.93 UEF (0.96 EF Canada), High Efficiency |
| BTU Input | 157,000 BTU |
| Voltage | 120 Volts |
| Installation Style | Outdoor Installation |
| Mounting Type | Wall Mount |
| Product Dimensions | 27.5 x 9.75 x 28.5 inches (Height x Depth x Width) |
| Item Weight | 77 pounds |
| Maximum Operating Pressure | 150 PSI |
| Special Features | Overheat Protection, Water & Gas Leak Detection, Freeze Protection (-30°F) |
| Included Components | Control Board, Inlet Thermistor, Heat Exchange Thermistor, Outlet Thermistor, Thermistor Wiring Harness, Gas Control Valve, Gas Control Wiring Harness, Burner Assembly, Igniter Coil, Ignitor Rod, Blower Motor, Blower Case, Burner Manifold, Flame Rod, Flame Rod Wire, Gas Inlet Connector, Water Control Valve, Bypass Assembly, Water Inlet Connector, Inlet Water Filter, Hot Water Outlet Connector, Drain Plug with Relief, Remote Control Terminal Block, Remote Control Terminal, Gas Shutoff Valve, Replacement Screw Kit, Replacement O-Ring Kit |
Figure 4: Dimensions of the Rheem RTGH-84XLP-2 unit.
Warranty Information
The Rheem Prestige RTGH-84XLP-2 water heater comes with the following warranty:
- Heat Exchanger: 12 years
- Parts: 5 years
- Labor: 1 year
Important: The warranty is void if the unit is not installed by a qualified professional. Retain your proof of purchase and installation records for warranty claims.
Support
For technical assistance, troubleshooting, or warranty inquiries, please contact Rheem customer support or visit the official Rheem website. Ensure you have your model number (RTGH-84XLP-2) and serial number ready when contacting support.
Rheem Official Website: www.rheem.com
