Switch to Demand Duo®
Easy installation, superior performance and longer life mean there has never been a better time to switch from traditional tanks to the consistency and efficiency of Demand Duo H- and R-Series solutions.
Demand Duo® Benefits
![Flex gas connector with rotation image](https://www.rinnai.us/sites/default/files/styles/large/public/2024-06/FlexGasConnector.jpg)
Flexible Installation
Features a preassembled gas connection with an installed drip leg and swivel flex line allowing for quick and hassle-free installation.
![Demand Duo HCx in the basement](https://www.rinnai.us/sites/default/files/styles/large/public/2024-06/3549_DD_HCS100199_Basement__0000_Post.jpg)
A Better Value
Demand Duo® delivers more value than standard tanks, including a lower cost of ownership, energy-saving performance, and abundant hot water when you need it.
![2X warranty logo for Demand Duo square](https://www.rinnai.us/sites/default/files/styles/large/public/2024-06/2023067%20-%20Demand%20Duo%20R%20Warranty%20Logo.jpg)
2X the Warranty
Unlike most condensing tank type heaters, Demand Duo offers a 6-year warranty on the tank.
How it Works
How Demand Duo Works
Water heats in the tankless unit rather than inside the tank, providing:
- Zero thermal stress on the tank.
- More hot water capacity, since tank only holds two magnesium anode rods.
- Easy, cost-effective tankless maintenance verses replacing an entire tank every few years.
- Ideal for emergency replacement; installs like a tank, but over 100 lbs lighter than most tanks.
Demand Duo® Solutions
Demand Duo®
H-Series
Bringing a multitude of installation options as well as an upgraded recovery pump for improved tank recovery time.
- Direct Replacement for High-Efficiency Tanks
- Preassembled electric and gas connections
- Heats Water in Tankless | Zero Thermal Stress on Tank
![Demand Duo H-Series with CX Tankless Unit, cover on](https://www.rinnai.us/sites/default/files/styles/scale_width_200px/public/2024-05/DemandDuo_HSeries_CHS100199_Silo_CoverON__0000.png)
Demand Duo®
R-Series
Our Non-Condensing Hybrid brings the performance, versatility, and reliability of Rinnai-backed by the Industry’s best warranty.
- Cold Water Inlet Connection at the top of the tank
- Pre-Installed Exhaust Connector
- Included 3-Piece 6” Vent Accessory Kit
![Demand Duo R-Series 100](https://www.rinnai.us/sites/default/files/styles/scale_width_200px/public/2023-03/Demand-Duo_100R_hero_image.png)
Demand Duo® 2V
Combining the redundancy and performance of our tankless rack systems with the hybrid technology of Demand Duo®.
- Two tankless units and two pumps for maximum performance, redundancy, and reliability
- Delivers 551 Gallons in the First Hour at 100° F Delta T
- ASME certified option available
![Demand Duo HCx](https://www.rinnai.us/sites/default/files/styles/scale_width_200px/public/2024-06/DemandDuo_HSeries_DD398100HX_Silo_CoverON__0001.png)