Demand Rapid: Rapid recovery storage system

Smaller commercial rapid recovery storage systems.

Demand Rapid: Rapid recovery storage system

A complete storage hot water system made up of a Rinnai INFINITY commercial continuous flow gas water heater (external or internal unit), a pump, a thermostat and controller, and a 315 L Demand Duo cylinder.

How it works
The thermostat senses the temperature of the water in the cylinder, and when it drops below the set point, the pump is activated. The flow then starts the Rinnai INFINITY, which returns heated water to the cylinder.

Demand Rapid systems available:
• DD1200E315N/L (HD200 external in NG or LPG)
• DD1200I315N/L (HDi200 internal in NG or LPG)
• DD1250E315N/L (HD250 external in NG or LPG)
• DD1N56E315N/L (N56 external in NG or LPG)
• DD1N56I315N/L (N56 internal in NG or LPG)

For smaller commercial (small motels) or larger residential applications where a large quantity of hot water is required quickly, but there is recovery time available before next use. For example filling a machine or filling a spa bath.

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.

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


195-249 MJ/h


44.5-57.8 kW


DN20 ¾ " BSP male

Cold water inlet

DN32 1¼ " BSP female

Hot water outlet

DN32 1¼ " BSP female

Hot water return

DN32 1¼ " BSP female (not used)

Condensate  DN15 ½ " (EF models only)

DN20 ¾ " BSP female

850 kPa, 99 °C, 46 kW

Electricity 230 V AC GPO
ECV 700 kPa (not supplied)
PLV 500 kPa (not supplied)

Hot water delivery DD1200E315 & DD1200i315

Raised 25 °C = 1500 L/h

Raised 35  °C = 1250 L/h

Raised 45  °C = 950 L/h

Raised 50  °C = 875 L/h

Raised 55  °C = 800 L/h

Hot water delivery DD1N56E315, DD1N56i315 & DD1250E315 

Raised 25 °C = 1700 L/h

Raised 35  °C = 1400 L/h

Raised 45  °C = 1200 L/h

Raised 50  °C = 1100 L/h

Raised 55  °C = 1000 L/h

Ingress protection rating IPX4 (cylinder, control box and Rinnai INFINITY)
System configuration

Thermostat pump on 60 °C

Thermostat pump off 65 °C

INFINITY setting 75 °C

Max. outlet water temperature 75 °C

Market release

Top down heating released June 2019 (superseding previous bottom up heating system

DD1200E315 dimensions

DD1200E315 dimensions diagram

DD1200i315 dimensions

DD1200i315 dimensions diagram

DD1N56E315 dimensions

DD1212E315 dimensions diagram

DD1N56i315 dimensions

DD1212i315 dimensions diagram

DD1250E315 dimensions

DD1250E315 dimensions diagram

Ducted Gas Heating Service Centre

Ducted Gas Heating Service Centre
Operating 5 days a week, 8am to 5pm, Monday to Friday our New Zealand based customer service centre provides nothing but top quality. If you need to book in a Ducted Gas Heating service, we have a team of providers fully trained and equipped with diagnostic tools to service your appliance when you need them. 

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