Efficiently manages water quality.

The HEX250 is designed to manage water quality across an extensive range of commercial applications. It does so by separating consumable hot water from the heat source.

The HEX250 separates the consumable hot water by running it through stainless steel heat exchange coils that sit inside its heavily insulated tank. Using thermal energy, the hot water stored inside the tank heats the coils, which in turn heat the consumable water.

Separates consumable water from the heat source

Stainless steel tanks and coils

European temperature control technology

  • 444-grade Stainless Steel 250 litre storage tank
  • Highly efficient HD200's used as the heat source
  • Available in modules of 1, 2 and 3
  • Can be installed internally or externally
  • Internal or external systems available
  • Internal system can be used with individual flueing and common flueing

Suitable applications include:

  • Hotels and motels
  • Apartments
  • Shower Blocks
  • Mining
  • Health Care
  • Commercial Kitchens
  • Correctional facilities

The HEX250 system will deliver a constant output temperature of 60°C. To further enhance the efficiency of the HEX250 system, Rinnai has utilised an innovative control system which adjusts the temperature of the heated water to reflect the consumable water demand. It does this with an accurate temperature sensor, therefore reducing the amount of start ups each Continuous Flow unit has to complete. The water heaters have modulating burners which match the output of the heater to the hot water demand. The reduction in start  ups prolongs the life of the heat source and reduces the start up gas consumption.

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 This information may be different for superseded products. For superseded products please contact Rinnai to confirm product information.


  • Where to buy?

    Where to buy?

    You can use the store locator on our website to find your closest store.

  • How do I contact Rinnai?

    How do I contact Rinnai?

    You can contact us at 1300 555 545 or email us using the “contact us” form on our website.

Book a Service

Looking for support? Please get in touch and let us help.

Locate a Store

We'll help you find a Rinnai stockist so you receive the right advice and product, as locally as possible.