Without ringmain


Continuous flow hot water on demand

Customised hot water system with 2-25 Rinnai INFINITY commercial units electronically manifolded together, using the Rinnai MECS system (manifold electronic control system), on a freestanding skid with insulated pipework. Wall mount and back-to-back systems are also available.

This system can offer energy savings as there are no cylinder heat losses or pilot lights, and the system only uses gas when in operation. Demand Direct provides endless water for applications where there is peak demand for a set period of time.


  • quick and easy installation
  • only on when there is hot water demand
  • outlet temperature is constant, even when flow rate varies

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Product Details

Ideal for commercial applications where demand can be easily calculated by totaling the full flow from all outlets used, such as; shower blocks, restaurants, and food processing plants.

For commercial applications the water heating system must be sized and installed to written guidelines from Rinnai.

Hard or aggressive water will need to be treated in order to use this system, if in doubt please test before use.

Not suitable or approved as a pool heater.

Technical Specifications


398-11194 MJ/h (2-6 INFINITY units)


94-282 kW (2-6 INFINITY units)

Smaller system codes

Up to 25 Rinnai INFINITY units can be manifolded together. Only the smaller systems using HD units are listed below. For system specifications on larger systems, please contact us.

Code System configuration
RCWHD400EN/L 2 x HD200 externals
RCWHD600EN/L 3 x HD200 externals
RCWHD800EN/L 4 x HD200 externals
RCWHD1000EN/L 5 x HD200 externals
RCWHD1200EN/L 6 x HD200 externals
RCWHD400FFN/L 2 x HDi200 internals
RCWHD600FFN/L 3 x HDi200 internals
RCWHD800FFN/L 4 x HDi200 internals
RCWHD1000FFN/L 5 x HDi200 internals
RCWHD1200FFN/L 6 x HDi200 internals
  • Cold inlet: 1½ " BSP male (32 mm)
  • Hot outlet: 1½ " BSP male (32 mm)
  • Gas: 1½ BSP male (32 mm)

Alternate connection options are available, please call to discuss

IP rating


Supply pressures
  • NG: 1.13-3.5 kPa
  • LPG: 2.75 kPa
  • Water: 300-1400 kPa
Temperature settings available

Standard factory preset is 75 °C. Units can be adjusted via DIP switch, to deliver 42, 55, 60, 70, 75 and 85 °C. Advise at the time of order, or if on site refer to the back of the installation manual for information on how to change. If using with storage backup the INFINITY units must be set to 75 °C.

CAD/BIM Downloads