1. Introduction
This manual provides essential information for the safe and efficient operation, installation, and maintenance of your Rinnai RUS65EP Tankless Hot Water Heater. The RUS65EP is a propane-fueled, outdoor-installed unit designed to provide a continuous supply of hot water at a flow rate of up to 6.5 Gallons Per Minute (GPM). Please read this manual thoroughly before installation or use.
Front view of the Rinnai RUS65EP Tankless Hot Water Heater, a compact unit designed for outdoor installation.
2. Product Features
- Endless Hot Water: The unit heats water on demand, ensuring a continuous supply without running out, even during peak usage.
- Energy and Space Efficient: By heating water only when needed, the RUS65EP conserves energy. Its compact design saves valuable indoor space, as it is intended for outdoor installation.
- Optimal Water Pressure: Delivers a high-performance hot water flow rate of up to 6.5 GPM, suitable for serving multiple appliances simultaneously.
- Longer Lifespan: Tankless water heaters, like the RUS65EP, typically have a longer operational lifespan compared to traditional tank heaters, often lasting up to twice as long.
Key features of the Rinnai RUS65EP, highlighting its propane fuel, outdoor installation, and capacity to support multiple appliances.
The Rinnai RUS65EP provides constant hot water, ideal for various household needs.
The unit supports simultaneous use of multiple hot water appliances without interruption.
3. Setup and Installation
The Rinnai RUS65EP is designed for outdoor installation and operates on propane gas. Due to the complexities of gas and water line connections, professional installation is strongly recommended. Refer to the detailed installation instructions provided with the unit for specific requirements and safety guidelines.
Venting
This unit utilizes 3-inch venting. It supports both separate intake and exhaust vents or a concentric vent system. Ensure proper venting materials and configurations are used as specified in the installation manual to prevent exhaust gas recirculation and ensure safe operation.
Isolation Valves
Installation of isolation valves is crucial for future maintenance and servicing. These valves allow the unit to be isolated from the main water supply for flushing and repairs without affecting the rest of the plumbing system.
The compact design of the tankless water heater allows for wall-mounted installation, saving space.
This video provides an overview of Rinnai tankless water heaters, highlighting their benefits and operational principles.
4. Operating Instructions
The Rinnai RUS65EP operates by heating water instantaneously as it flows through the unit, eliminating the need for a storage tank. When a hot water tap is opened, the unit senses the flow and activates the burner to heat the water to the set temperature.
Temperature Settings
The water temperature can be adjusted using internal dip switches. Consult the installation manual for instructions on accessing and setting these switches to your desired temperature. The unit is designed to maintain a consistent output temperature.
This video demonstrates various Rinnai product features and operational aspects, including how tankless units provide hot water on demand.
5. Maintenance
Regular maintenance is essential to ensure the longevity and optimal performance of your Rinnai tankless water heater. Unlike traditional tank heaters that accumulate rusty sediments, tankless units benefit from periodic flushing to prevent mineral buildup, especially in areas with hard water.
Flushing the Unit
It is recommended to flush the unit annually to remove any scale or mineral deposits that may have accumulated. This process typically involves isolating the unit, connecting a pump and a descaling solution, and circulating the solution through the heat exchanger. Consult your professional installer or the Rinnai service manual for detailed flushing procedures.
General Care
Keep the area around the unit clear of obstructions and debris. Ensure that the air intake and exhaust vents are not blocked. Periodically inspect the unit for any visible signs of wear, leaks, or damage.
6. Troubleshooting
If you experience issues with your Rinnai RUS65EP, refer to the troubleshooting section in the comprehensive owner's manual for specific diagnostic steps and solutions. Common issues may include:
- No Hot Water: Check gas supply, power supply, and ensure water flow is above the minimum activation rate.
- Inconsistent Water Temperature: May indicate mineral buildup requiring flushing, or issues with water pressure/flow.
- Error Codes: The unit may display error codes on its interface. Consult the manual to interpret these codes and identify the underlying problem.
For complex issues or if you are unsure about a repair, contact a qualified Rinnai service professional.
7. Specifications
Below are the key specifications for the Rinnai RUS65EP Tankless Hot Water Heater:
Ground water temperature map and corresponding flow rate capabilities for Rinnai tankless water heaters, including the RUS65EP.
| Specification | Detail |
|---|---|
| Brand | Rinnai |
| Model Number | RUS65EP |
| Product Dimensions | 14.5"W x 35"H x 10.5"D (267 mm) |
| Color | Outdoor Installation |
| Maximum Flow Rate | 6.5 Gallons Per Minute |
| Heat Output | 65 Kilowatts |
| Efficiency | High Efficiency (Energy Star Certified) |
| Fuel Type | Propane Gas |
| Voltage | 120 Volts |
| Item Weight | 63 pounds |
| Mounting Type | Wall-mounted (Outdoor) |
8. Warranty and Support
Rinnai stands behind the quality of its products. The RUS65EP Tankless Hot Water Heater comes with the following residential factory warranty:
- Heat Exchanger: 120 months (10 years)
- Parts: 60 months (5 years)
- Labor: 12 months (1 year)
For warranty claims, technical assistance, or to locate a qualified Rinnai professional for installation or service, please visit the official Rinnai website or contact Rinnai customer support. Professional installation is highly recommended to ensure proper operation and warranty validity.