The Easy to Install, Smart Alternative to Atmospheric Tanks
Installing Rinnai's R-Series hybrid technology is easy because it connects to 6" B-Vent, making it unlike anything else on the market.
Smart because the R-Series heats water in the tankless and not the tank, which greatly reduces thermal stress and the risk of downtime or leaks.

Installation Ease: |
1. NEW 6" B-Vent Exhaust Connector |
2. NEW Pre-assembled Gas Connection |
3. NEW Pre-assembled Electrical Connection |
Optimized Performance: |
Multiple Sizes: |
6. NEW 80 or 119-Gallon Tank Options |

B-Vent: Best in Class, Easy to Install
Demand Duo™ R-Series vents into existing 6” B-Vent which eliminates the need for new vent runs or ceiling, roof and wall penetrations.
Intake Filter and Exhaust Connector (IFEC)
- Exhaust Connection for 6’’ B-Vent
- Screen Filter for Intake Air
- Factory Installed on Demand Duo™ R-Series


Pre-assembled Gas Connection - Quick, Simple Installation
The Demand Duo R-Series saves you time, materials and cost with pre-installed Dirt Leg and flexible Gas Swivel Flex Line that easily and conveniently connects to the existing gas supply line.

Pre-assembled Electrical Connection - Locate R-Series Anywhere
Demand Duo™ R-Series has electrical access built into the side of every tank. Now you can locate the unit where it makes sense rather than near the closest wall receptacle.
Digital Controller - Maximum Performance and Convenience
The NEW Digital Controller with LED Display and Function Lights allows for easy system monitoring and setting adjustments.
Building Re-circulation Control is also built in with multiple temperature offset options of 10° Fahrenheit, 20° F or 30° F; a separate aquastat is no longer required.

Demand Duo™ R-Series runs on the DuoSmart™ Tank Technology platform, meaning the tankless, pump and controller seamlessly perform more reliably than traditional atmospheric tanks.
This certified system has a set point temperature range of 120-180°F and is a Category 1 Commercial Appliance that conveniently vents through existing 6” Single or Double Wall B-vent.

80 or 119 Gallon Tank Options —
High Performance for Any Business Demand
Our commercial hybrid water heating solution is available with two tank sizes, 80 and 119-gallon, to meet any commercial demand requirement, whether installing in a small restaurant or large hotel.
80 Gallon / 119 Gallon