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

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®

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®

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

Demand Duo®

Non-Condensing Hybrid

View Models

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

Get a custom solution and a professional installation for your business from our Rinnai experts.