1. Product Overview
The Rheem RTGH-84DVLP-3 is a Super High Efficiency indoor condensing liquid propane tankless gas water heater designed to provide continuous hot water. This model incorporates advanced features for efficiency and user convenience.
Key Features:
- Flow rate of 0.4 - 8.4 GPM (Gallons Per Minute).
- Adjustable temperature settings ranging from 100°F to 140°F (default setting of 120°F).
- Equipped with electric ignition.
- Features Hot Start Programming to minimize cold water bursts during frequent on/off usage.
- Exclusive Overheat Film Wrap for heat exchanger overheat protection.
- Compact design for space-saving installation.
- Integrated Digital Display for easy monitoring and control.
Figure 1: Front view of the Rheem RTGH-84DVLP-3 Tankless Water Heater, showing the digital display and Rheem logo.
Figure 2: Rheem RTGH-84DVLP-3 highlighting new compact design, continuous hot water, integrated digital control, and super high energy efficiency.
2. Setup and Installation
Proper installation is crucial for the safe and efficient operation of your tankless water heater. It is recommended that installation be performed by a qualified professional.
Installation Considerations:
- Venting: As a condensing unit, this model allows for PVC venting, simplifying installation compared to non-condensing units that require stainless steel piping.
- Gas Line: A 3/4-inch natural gas line is recommended for optimal performance.
- Electrical Requirements: Tankless gas water heaters require an electrical power supply to function.
- Piping: Inlet and outlet piping may require alterations to connect the tankless gas water heater.
- Clearances: The unit features industry-best 1/2-inch side-to-side and zero front and back clearance requirements, allowing for flexible installation in small spaces like closets.
Figure 3: The Rheem RTGH-84DVLP-3 installed in a utility closet, demonstrating its compact size and minimal clearance requirements.
Figure 4: Checklist for replacing a gas tank with a tankless gas water heater, detailing considerations for venting, main gas line, electricity, and piping.
3. Operating Instructions
Your Rheem RTGH-84DVLP-3 tankless water heater is designed for user-friendly operation with its integrated digital display and advanced features.
Basic Operation:
- Power On/Off: Use the power button on the integrated digital display to turn the unit on or off.
- Temperature Adjustment: Use the up and down arrows on the digital display to set your desired water temperature between 100°F and 140°F. The default setting is 120°F.
- Hot Start Programming: This exclusive feature keeps the water heater in a ready state for 5 minutes after a hot water faucet is turned off. This minimizes cold water bursts during frequent on/off situations, such as washing dishes.
How it Works:
When a hot water faucet opens, cold water enters the unit and passes through a flow sensor. The control board determines the required heat based on the inlet water temperature and water flow rate. Air is drawn in through the inlet venting as the gas valve opens, and the igniter sparks. The control board activates the necessary number of burners to heat the water. Water flows through the secondary heat exchanger, then through the primary, increasing its temperature. The control board continuously monitors outlet temperatures and makes constant adjustments to modulate the heat level, water flow, and cold water bypass to ensure the outlet temperature is as close to the set point as possible.
Video 1: An animated demonstration of how the Rheem RTGH Series tankless water heater operates, showing water flow, heating process, and temperature modulation.
4. Maintenance
Regular maintenance ensures the longevity and optimal performance of your Rheem tankless water heater. While maintenance is minimal, periodic checks are recommended.
Recommended Maintenance:
- Annual Flushing: It is recommended to flush the unit annually to remove mineral buildup, especially in areas with hard water. Consult your installer or a qualified technician for this procedure.
- Vent Inspection: Periodically inspect the venting system for any obstructions or damage.
- General Cleaning: Keep the exterior of the unit clean and free from dust and debris.
5. Troubleshooting
If you encounter issues with your water heater, refer to the following common troubleshooting tips. For complex problems, contact a qualified service technician.
Common Issues and Solutions:
- No Hot Water / Error Codes: If the unit displays an error code (e.g., Code 11), consult the full owner's manual for specific code meanings and troubleshooting steps. Ensure the power supply and gas valve are open.
- Cold Water Bursts: The Hot Start Programming feature is designed to minimize this. If cold bursts persist, ensure the feature is active or consider if multiple high-demand fixtures are running simultaneously.
- Leak Detected: The integrated LeakGuard™ Leak Detection and Prevention system will alert homeowners to any internal leak and stop the flow of water. If a leak is detected, immediately contact a qualified technician.
- Insufficient Hot Water: Check the set temperature on the digital display. Ensure the flow rate is within the unit's capacity for your household's demand.
6. Specifications
| Feature | Specification |
|---|---|
| Brand | Rheem |
| Model Number | RTGH-84DVLP-3 |
| Capacity (Flow Rate) | 8.4 Gallons Per Minute (GPM) |
| Power Source | Liquid Propane (fuel_powered) |
| Product Dimensions (W x H x D) | 17.7"W x 23.7"H x 9.8"D |
| Item Weight | 59.88 Pounds |
| Maximum Temperature | 140 Degrees Fahrenheit |
| Voltage | 120 Volts |
| Efficiency | 0.93 UEF |
| Mount Type | Wall |
| Material Type | Stainless Steel |
| Special Features | Integrated Digital Display |
Figure 5: Diagram showing the dimensions of the Rheem RTGH-84DVLP-3 unit.
Figure 6: Performance Guide for RTGH Series models, illustrating water flow (GPM) at various temperature rises.
7. Warranty Information
The Rheem RTGH-84DVLP-3 Tankless Water Heater is covered by the following manufacturer warranties:
- Labor: 1 year
- Heat Exchanger: 15 years
- Parts: 5 years
Please retain your proof of purchase for warranty claims. For full warranty details, refer to the official Rheem warranty documentation included with your product or visit the Rheem website.
8. Support and Contact
For further assistance, technical support, or service inquiries, please use the following resources:
- Rheem Official Store: Visit the Rheem Store on Amazon for product information and accessories.
- Customer Service: Refer to the contact information provided on the product's EnergyGuide label or the official Rheem website for direct support.