Demand Duo
Demand Duo
Delivers on Demand
The Rinnai’s Demand Duo System links from one to six of our highly efficient heavy-duty continuous flow water heaters to a heavily insulated stainless steel storage tank. The linking of water heaters to a storage tank, allows for short periods of peak hot water use that are greater than the continuous flow rate the water heaters can achieve on their own. Using new controller technology that offers various temperature settings and a host of other features you can't go wrong with a Demand Duo.
What's more the Demand Duo 1 is the perfect solution to replace your existing storage hot water heater with no changes required to the water pipes.
Return to COMMERCIAL home
Locate Your Nearest Store
Hotels and Motels
Apartment Blocks
Student Accommodation
Suitable applications include:
- Hotels and motels
- Apartment blocks
- Student accommodation
- Shower blocks
- Commercial kitchens
- Commercial laundries
We recommend the installation of a Demand Duo system when hot water consumption has a predictable volume. This is usually based on the number of people living in a particular building and their hot water usage or industrial machines that require regular peaks of water.
The Demand Duo unit is often used on flow and return systems that distribute the water around a building.
The product information on this website (comprising product brochures, warranty information, installation manuals, diagrams, specifications and representations) relates to current products. This information may be different for superseded products. For superseded products please contact Rinnai to confirm product information.
-
Rinnai Demand Duo DD HD200E (right)Preview
-
Rinnai Demand Duo DD HD200E (interior)Preview
-
Rinnai Demand Duo DD Horizontal Side TankPreview
-
Rinnai Demand Duo DD Controller (LCD screen panel)Preview
-
Rinnai Demand Duo DD HD28i (flue) + Demand Duo TankPreview
-
Rinnai Demand Duo DDF5210i315N (room sealed)Preview
-
Rinnai Pumpplate (no cover)Preview

-
Demand Duo Specification Guide Preview
-
Storage heater (DD1) Specification Guide Preview
-
Demand Duo Systems Operation and Installation Manual Preview
-
DD1 Flue Adaptor Installation Manual Preview
-
Commercial Controller Operating and Installation Manual Preview
-
Commercial Hot Water Warranty Booklet Preview
-
Gas Continuous Flow Hot Water Error Codes Preview
-
Plans - Demand Duo Horizontal Tank (PDF) Preview
-
Plans - 1. SK 0264 DD128E315N Demand Duo (PDF) Preview
-
Plans - 2. SK 0265 DDF228E-250-315N Demand Duo (PDF) Preview
-
Plans - 3. SK 0272 DDF328E-250-315N Demand Duo (PDF) Preview
-
Plans - 4. SK 0273 DDF428E-250-315N Demand Duo (PDF) Preview
-
Plans - 5. SK 0276 DDF528E-250-315N Demand Duo (PDF) Preview
-
Plans - 6. SK 0277 DDF628E-250-315N Demand Duo (PDF) Preview
-
Plans - 1. SK 0269 DD128I250-315N Demand Duo (PDF) Preview
-
Plans - 2. SK 0270 DDF228I-250-315N Demand Duo (PDF) Preview
-
Plans - 3. SK 0271 DDF328I-250-315N Demand Duo (PDF) Preview
-
Plans - 4. SK 0274 DDF428I-250-315N Demand Duo (PDF) Preview
-
Plans - 5. SK 0275 DDF528I-250-315N Demand Duo (PDF) Preview
-
Plans - 6. SK 0278 DDF628I-250-315N Demand Duo (PDF) Preview
-
Plans - 1. SK 0156 DD1210E-250-315N-L Demand Duo (PDF) Preview
-
Plans - 2. SK 0157 DDF2210E-250-315N Demand Duo (PDF) Preview
-
Plans - 3. SK 0158 DDF3210E-250-315N Demand Duo (PDF) Preview
-
Plans - 4. SK 0159 DDF4210E-250-315N Demand Duo (PDF) Preview
-
Plans - 5. SK 0160 DDF5210E-250-315N Demand Duo (PDF) Preview
-
Plans - 6. SK 0161 DDF6210E-250-315N Demand Duo (PDF) Preview
-
Plans - 1. SK 0162 DD1210I-250-315N Demand Duo (PDF) Preview
-
Plans - 2. SK 0163 DDF2210I-250-315N Demand Duo (PDF) Preview
-
Plans - 3. SK 0164 DDF3210I-250-315N Demand Duo (PDF) Preview
-
Plans - 4. SK 0165 DDF4210I-250-315N Demand Duo (PDF) Preview
-
Plans - 5. SK 0166 DDF5210I-250-315N Demand Duo (PDF) Preview
-
Plans - 6. SK 0167 DDF6210I-250-315N Demand Duo (PDF) Preview
-
Plans - 1. RA-27-09-13-001 DDDP2060NFDPC Pumpset (PDF) Preview
-
Plans - 2. RA-02-04-14-001 DDDP2580NFDPC Pumpset (PDF) Preview
-
Plans - 3. RA-10-02-14-001 DDDP32100NFDPC Pumpset (PDF) Preview