Table of Contents
Introduction
The Rinnai RE Series represents a significant step forward in the evolution of non-condensing tankless water heater technology. Designed from the ground up to replace older, less efficient models, the RE Series serves as a versatile and “smart” solution within the broader Rinnai lineup. While many homeowners are familiar with traditional tank-style heaters that keep a large volume of water hot at all times, the RE Series utilizes “on-demand” heating. This means the unit only operates when a hot water tap is turned on somewhere in the home.
By focusing on a complete internal redesign, Rinnai has positioned the RE Series as a go-to option for those seeking high performance without the complexity of condensing systems. It balances modern digital connectivity with a simplified mechanical layout, making it an ideal choice for residential upgrades. This series is specifically engineered to make the transition from a traditional tank to a tankless system smoother and more reliable for modern households.
Overview of the Rinnai RE Series
The Rinnai RE Series is a non-condensing tankless water heater. In the world of water heating, “non-condensing” refers to how the unit handles the heat generated during the combustion process. Unlike condensing models that use a second heat exchanger to capture extra heat from exhaust gases, the RE Series uses a single, highly durable heat exchanger. This design allows for a more compact footprint and simplifies the venting requirements, as the exhaust temperatures remain high enough to prevent moisture from forming inside the vent pipes.
Within the Rinnai product hierarchy, the RE Series is designed to be the “smarter” successor to previous non-condensing generations. It offers a mid-range efficiency rating that significantly outperforms any standard tank heater while maintaining a lower price point than the ultra-high-efficiency condensing units.
The primary design purpose of this series is to provide a reliable, long-lasting hot water source that is easier to service and faster to install. It fits perfectly for homeowners who want the benefits of endless hot water and space savings without the need for the specialized drainage lines required by condensing technology.
The interior of the RE Series has been “designed from the inside out.” This isn’t just a marketing phrase; it refers to the modular component layout. By organizing the internal parts more logically, the unit allows for better airflow and easier access for maintenance. This thoughtful engineering ensures that the unit can maintain consistent water temperatures even during peak demand periods, providing a stable and comfortable experience for the user.
Key Features of the RE Series
The RE Series is packed with features that prioritize both the homeowner’s comfort and the long-term health of the plumbing system. Here are the standout technical aspects of this model:
- Integrated Wi-Fi Technology: Many models in the RE Series come with Rinnai’s Control-R™ Wi-Fi module compatibility. This allows homeowners to monitor the system, adjust temperatures, and even receive maintenance alerts directly on their smartphones.
- Compact Wall-Mounted Design: Because it does not require a bulky storage tank, the RE Series frees up significant floor space. It can be mounted in tight spaces, such as closets, attics, or crawlspaces, depending on local building codes.
- Improved Serviceability: The internal layout features a modular design. If a component ever needs to be tested or replaced, the simplified access points reduce the time required for a technician to perform the work.
- Enhanced Scale Detection: Hard water can be a challenge for any water heater. The RE Series includes advanced sensors designed to detect scale buildup early, protecting the heat exchanger from damage and maintaining efficiency over time.
- Versatile Venting Options: The series supports multiple venting configurations, including room-air and outdoor installations. This flexibility is crucial when replacing an older unit where venting paths are already established.
- Stable Temperature Control: Using advanced gas modulation, the RE Series can precisely adjust the flame size to match the water flow, preventing “cold water sandwiches” or sudden spikes in temperature.
Where This Model Works Best
The Rinnai RE Series is a highly adaptable unit, but it truly shines in specific residential scenarios. It is often the “Goldilocks” solution for many homeowners—providing more than enough power without being over-engineered for the home’s specific needs.
- Older Home Retrofits: For homes built several decades ago, switching to a tankless system can sometimes be complicated by existing gas lines and vent locations. The RE Series is designed specifically to make these retrofits easier. Since it is a non-condensing unit, it often utilizes stainless steel venting that can be routed through existing chimneys or roof lines more easily than the plastic piping required by condensing models.
- Small to Mid-Sized Households: The RE Series is exceptionally efficient at handling the demands of a standard two-to-three-bedroom home. Whether it is running a shower and a dishwasher simultaneously or providing back-to-back baths for children, the unit’s flow rate is optimized for steady, reliable delivery. It is an excellent choice for families looking to upgrade from a 40 or 50-gallon tank.
- Space-Constrained Properties: In many Central Valley homes, the water heater is located in a crowded garage or a small utility closet. By moving the water heater to the wall, the RE Series opens up floor space for storage or other appliances. Its sleek profile makes it much less intrusive than a traditional cylinder tank.
- Homeowners Prioritizing Simplicity: If you prefer a system that is straightforward and robust, the RE Series is a great fit. It avoids the added complexity of a condensate pump and secondary heat exchanger while still offering the modern “smart” features that allow for remote monitoring.
Installation Considerations
Installing a Rinnai RE Series tankless water heater involves more than just hanging a box on the wall. Several technical factors must be addressed to ensure the unit operates safely and meets manufacturer warranty requirements.
- Gas Supply Requirements: Tankless heaters require a larger burst of BTUs (British Thermal Units) than tank heaters because they must heat water instantly. During installation, the existing gas line must be evaluated. If the pipe is too small, the unit may not receive enough fuel to reach the desired temperature, or it may cause other gas appliances in the home to flicker or underperform.
- Venting Configuration: Since the RE Series is a non-condensing unit, its exhaust gases are quite hot. This requires specific venting materials, usually category III stainless steel. Ensuring the vent has the proper clearance from windows, doors, and roof lines is essential for safety and to prevent carbon monoxide from re-entering the home.
- Water Quality and Filtration: In areas with high mineral content in the water, scale can build up inside the heat exchanger. While the RE Series has excellent scale detection, we often recommend installing a scale-inhibitor filter or a water softener alongside the unit. This protects your investment and ensures the unit maintains its high-efficiency rating for its entire lifespan.
- Service Valve Installation: A proper installation always includes a set of service valves (also known as isolation valves). These allow a technician to flush the system with a cleaning solution annually without having to shut off water to the entire house. This is a critical step for long-term maintenance.
Professional Tankless Water Heater Installation
Choosing the right equipment is only half the battle; the quality of the installation determines the lifetime value of your system. A professional installation ensures that the unit is sized correctly for your home’s peak demand. Sizing involves calculating the “temperature rise”—the difference between the incoming cold water temperature and your desired hot water temperature—and matching it to the unit’s flow rate.
When we perform a tankless water heater installation, we take into account the unique climate and water conditions found in Clovis, Fresno, and surrounding Central Valley communities. Our team handles the complex gas pressure calibrations and ensures that the venting meets the strict California building codes. A DIY approach or an amateur installation can lead to frequent error codes, reduced efficiency, or even hazardous conditions involving gas leaks or improper venting.
Professional installers also ensure that the unit is registered for its warranty and that all electrical connections for the “smart” features and Wi-Fi modules are configured correctly. This gives you peace of mind that your hot water will be there when you need it, backed by a system that was built to last.
Manufacturer Information
For detailed technical data and parts diagrams, you can visit the Rinnai official product specifications.
Google Business Profile
To see examples of our recent work in your neighborhood, feel free to browse our recent customer reviews and project photos.
Other Rinnai Tankless Models
• Rinnai Sensei RX
• Rinnai Sensei RXP
• Rinnai RUS Series
• Rinnai RUCS Series
• Rinnai REP Series
Frequently Asked Questions
Is the Rinnai RE Series a condensing tankless water heater?
No. The Rinnai RE Series is a non-condensing tankless water heater. Non-condensing units use a single heat exchanger and higher-temperature exhaust venting rather than the secondary heat exchanger used in condensing systems. This design simplifies installation because it does not require condensate drainage while still delivering reliable on-demand hot water.
What improvements were made in the Rinnai RE Series design?
The RE Series was redesigned internally to improve installation speed and service access. Rinnai reorganized internal components to make the system easier for plumbing professionals to install, maintain, and service while still delivering consistent hot water performance.
Can the Rinnai RE Series support multiple bathrooms?
Yes. When properly sized, the RE Series can supply hot water to multiple fixtures such as showers, sinks, and appliances. A professional installer will evaluate the home’s hot water demand to select the correct unit capacity for reliable performance.
Do Rinnai RE Series tankless systems require maintenance?
Yes. Like all tankless water heaters, the RE Series benefits from periodic maintenance. Flushing the system helps remove mineral buildup and maintain heat exchanger performance. Routine maintenance can extend system lifespan and help maintain efficiency.
