1. Introduction
This manual provides essential information for the safe and efficient operation, installation, and maintenance of your Rinnai RL94eP Propane Tankless Water Heater. Please read all instructions thoroughly before installation or use. Retain this manual for future reference.
The Rinnai RL94eP is an outdoor-mounted, propane-fueled tankless water heater designed to deliver continuous hot water at a flow rate of up to 9.4 gallons per minute (GPM).
2. Safety Information
Important Safety Instructions:
- Installation, adjustment, alteration, service, or maintenance must be performed by a qualified installer or service agency.
- Failure to follow these instructions could result in property damage, personal injury, or death.
- This appliance is for outdoor installation only.
- Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or any other appliance.
- Ensure proper ventilation and clearances as specified in the installation guide.
3. Product Overview
The Rinnai RL94eP tankless water heater features a compact design for outdoor installation. Key components include the heat exchanger, combustion system, and a digital controller for temperature management.
Figure 3.1: Front view of the Rinnai RL94eP Propane Tankless Water Heater, showing the control panel at the bottom.
4. Installation
Installation of the Rinnai RL94eP must be performed by a qualified and licensed professional in accordance with all local codes and regulations. This unit is designed exclusively for outdoor installation.
4.1 Site Selection
- Select an outdoor location with adequate clearance from windows, doors, and other building openings.
- Ensure the mounting surface is structurally sound and capable of supporting the unit's weight.
- Maintain proper clearances from combustible materials.
4.2 Plumbing and Gas Connections
Connect the cold water inlet, hot water outlet, and propane gas supply lines according to the detailed instructions in the separate installation manual provided with the unit. Use appropriate shut-off valves and unions for serviceability.
Figure 4.1: Illustrative diagram of a tankless water heater providing hot water to multiple points within a household.
5. Initial Setup
After professional installation, perform the following initial setup steps:
- Power On: Ensure the unit is connected to a 120V power supply.
- Gas Supply: Verify the propane gas supply valve is open.
- Water Supply: Open the cold water inlet valve and hot water outlet valve. Purge air from the system by opening hot water faucets throughout the house until water flows steadily.
- Digital Controller: The unit comes standard with an MC-91-1US Digital Controller. Use this controller to set the desired water temperature.
6. Operation
The Rinnai RL94eP provides hot water on demand. When a hot water faucet is opened, the unit senses the flow and initiates the heating process.
6.1 Temperature Settings
- Residential Use: The standard digital controller allows temperature settings from 98°F to 140°F.
- Commercial Use: For commercial applications requiring higher temperatures (up to 185°F), a separate commercial controller must be purchased and installed.
6.2 Continuous Hot Water
The unit is capable of supplying continuous hot water to multiple fixtures simultaneously, up to its maximum flow rate.
Constant Hot Water
Extended Hot Water Availability
6.3 Energy Efficiency
Tankless water heaters heat water only when needed, contributing to energy savings compared to traditional tank-style heaters.
Figure 6.1: Energy efficiency comparison.
6.4 Recirculation Technology
The unit supports recirculation technology, which can reduce the wait time for hot water at the faucet. This feature requires additional plumbing components.
Figure 6.2: Recirculation system diagram.
7. Maintenance
Regular maintenance ensures optimal performance and longevity of your Rinnai tankless water heater. It is recommended that a qualified service technician perform annual maintenance.
- Descaling: Periodically descale the unit to remove mineral buildup, especially in areas with hard water. Refer to the detailed descaling procedure in the full technical manual.
- Ventilation: Ensure the air intake and exhaust vents are clear of obstructions.
- Visual Inspection: Regularly inspect the unit for any signs of leaks, corrosion, or damage.
- Filter Cleaning: Clean any inline water filters as recommended by the manufacturer.
8. Troubleshooting
This section addresses common issues. For complex problems or error codes displayed on the digital controller, consult a qualified service technician.
| Problem | Possible Cause | Solution |
|---|---|---|
| No hot water | No power, gas supply off, water flow too low | Check power, open gas valve, ensure adequate water flow (minimum activation flow rate) |
| Inconsistent water temperature | Mineral buildup, fluctuating water pressure, incorrect temperature setting | Descale unit, check water pressure, adjust temperature setting |
| Error code displayed | Internal fault, specific component issue | Refer to the error code list in the full technical manual or contact a qualified technician. |
| Low hot water flow | Clogged filter, mineral buildup, partially closed valve | Clean filter, descale unit, ensure all valves are fully open |
9. Technical Specifications
Key specifications for the Rinnai RL94eP Propane Tankless Water Heater:
| Feature | Detail |
|---|---|
| Model Number | RL94eP |
| Fuel Type | Propane |
| Maximum Flow Rate | 9.4 Gallons Per Minute (GPM) |
| BTU Range | 10,300 – 199,000 BTU |
| Thermal Efficiency | 83% |
| Residential Temperature Settings | 98°F - 140°F |
| Commercial Temperature Settings | 98°F - 185°F (with optional commercial controller) |
| Installation Type | Outdoor Only |
| Voltage | 120 Volts |
| Dimensions (Product) | Approximately 2.54 x 2.54 x 2.54 cm (Note: This dimension seems incorrect based on typical water heater sizes and may be a data entry error. Refer to the official product sheet for accurate dimensions.) |
| Item Weight | 24.32 kg |
| Certification | Energy Star |
| Special Features | Circ-Logic technology, non-condensing technology |
| Included Components | Valve Kit |
10. Warranty Information
The Rinnai RL94eP Propane Tankless Water Heater comes with the following warranty for residential installations:
- Heat Exchanger: 12-Year Warranty
- Parts: 5-Year Warranty
- Labor: 1-Year Warranty
For complete warranty terms and conditions, please refer to the warranty document included with your product or visit the official Rinnai website.
11. Customer Support
For technical assistance, service inquiries, or to locate a qualified service technician, please contact Rinnai customer support. Have your model number (RL94eP) and serial number ready when contacting support.
You can find contact information on the official Rinnai website or in the documentation provided with your unit.
