Rinnai Demand Duo System

SKU: DDSYSTEM Categories: ,

Rinnai Demand Duo systems are a combination of between 1 and 6 gas continuous flow Heavy Duty water heaters with a 250 or 315 litre heavily insulated storage tank. The storage tank allows a short period of high hot water flow rate, greater than the combined continuous flow rate of the HD water heater(s).

Enquire About This Product Call 1300 137 567

More Information

Each Complete Demand Duo Packaged System includes:

    • One or more Rinnai Heavy Duty Series Water Heaters
    • A Manifold System (where multiple HD Heaters are used)
    • Primary Pump(s)
    • Thermostat
    • 205 or 315 Litre Stainless Steel Storage Tank

The Thermostat starts the pump when the temperature drops below the required heat. This in turn fires off the HD Water heater(s).

Ideal Applications

Anywhere predictable a large regular volume of Hot Water is required for showering, washing or regular industrial processes.

    • Hotels and Motels
    • Apartment Blocks
    • Student Accommodation
    • Shower Blocks
    • Commercial Kitchens
    • Commercial Laundry

The Demand Duo is typically installed with flow and return systems to ensure that there is only a short wait for Hot Water anywhere in the building.


How to make your selection

When you Request-a-Quote the following information is required for us to select a suitable Demand Duo system for your project:

    • Temperature rise required. Assumed to be 50° (15 – 65°C)
    • Volume of hot water used per event (i.e. people having a shower)
    • Number of times this event occurs (i.e. 6 uses of each shower head per hour)
    • Internal or external installation (also determines whether a flue system is required)

Combinations Available:

    • Boosters available: HD200/HD211/HD250
    • Location: Internal and External
    • Number of boosters needed: 1 – 6
    • Natural Gas or LPG
    • Tank sizes: 250 or 315 litres
    • A Solar Pre-Heat option is also available

All of our products are inspected by our experienced staff for quality and/or damage before sale or despatch.

If you have any issue with your purchase, please call G-Store on 1300 137 567 without delay. Make sure you have a copy of your invoice to hand. We will be happy to discuss the options that best solves the problem. Please do not return goods without our explicit instructions.

G-Store ships most of our products anywhere in Australia. You can also pick up free from our Melbourne store.

Shipping Cost Options

To offer you the most cost-effective shipping fees we use the Temando freight engine to dynamically search among available carriers and offer you

  1. The cheapest rate
  2. The fastest service

These are the two best options available at the time from among our carriers for your particular products to your specific location, wherever it is in the country.

We do not post to PO boxes.

Free Pick Up
If your delivery is to a Postcode within 150 km of G-Store in Melbourne (Keysborough) you will also be offered a Pick-Up In-Store option. If you select this, we will let you know as soon as your purchase is ready for Pick Up.

Keysborough – same day on stocked items if ordered before 2pm, next day after 2pm.

Warragul – next day on stocked items if ordered before 11am, otherwise add 1 business day.