The Rinnai Smart Cylinder™

A hot water cylinder that typically saves up to 10%* on your water heating bill!

The Rinnai Smart Cylinder™

This revolutionary hot water cylinder learns a households behaviour and only heats what's needed, saving you on water heating!

What is it?
The way that a traditional electric hot water cylinder works means that you are paying to heat all of the water in your cylinder 24 hours a day, 7 days a week, 52 weeks a year. The Rinnai Smart Cylinder™ has a smart thermostat which learns the pattern of hot water use of your house, and then only heats the water when it knows it's going to be needed, typically saving up to 10% on water heating costs*.

It's easy to use too with an LCD control pad, simply set and forget.

How it works
The smart cylinder has three modes that can be selected using the control pad; IQ mode (smart learning mode), manual mode, and vacation mode.

LCD control pad with function descriptions

Set, forget and save
When in this mode the Rinnai Smart Cylinder™ will learn one week of your households hot water usage behaviour. After the first week the Rinnai Smart Cylinder™ will apply the savings algorithm and only heat water in the cylinder when it knows it will be needed.

The Rinnai Smart Cylinder™ will constantly monitor the household water usage and update the saving algorithm continuously, ensuring that it is only ever heating water to meet demand.

Standard hot water cylinder graph showing water temperature throughout a 24 hour period.

Rinnai Smart Cylinder graph showing water temperature regulation throughout a 24 hour period.

Vacation mode icon VACATION MODE
In vacation mode the Rinnai Smart Cylinder will keep the water at a minimum temperature (6°C) to save power. This will also prevent the water from freezing in colder areas. Select the number of days you will be away for and the Rinnai Smart Cylinder will handle the rest. After the specified time it will automatically revert to the last mode you had it on meaning  you can have a hot shower as soon as you get in the door!

Manual mode iconMANUAL MODE
When in this mode the Rinnai Smart Cylinder™will operate as a traditional electric storage cylinder, ideal for when guests arrive.

Which cylinders can be smart?

Low-medium pressure stainless steel - Rinnai Smart Cylinder™ (135, 180, 250 L)

• Option of iQ mode—simply set and forget to typically save up to 10%* on your water heating bill!
• High grade duplex stainless steel tank
• Indoor cylinder
• Triple inlets making connection to existing plumbing easy
• Curved element design ensure you are heating 98% of water
• Can operate up to 120 kPa
• MEPS compliant
• 10 year warranty

Mains pressure enamel - Rinnai Smart Cylinder™(135, 180, 250 L)
• Option of iQ mode—simply set and forget to typically save up to 10%* on your water heating bill!
• High grade enamel lined tank
• Indoor cylinder
• Curved element design ensure you are heating 98% of water
• Cylinder protected by a full length high performance anode
• MEPS compliant
• 7 year warranty

Mains pressure stainless steel - Rinnai Smart Cylinder™(135, 180, 250 L)
• Option of iQ mode—simply set and forget and typically save up to 10%* on your water heating bill!
• High grade duplex stainless steel tank
• Indoor cylinder
• Curved element design ensure you are heating 98% of water
• Dip tubes take cold water to the bottom of the tank to avoid mixing with water that's already heated
• MEPS compliant
• 10 year warranty

Smart-Ready cylinder upgrades
Now that Smart cylinders are back in stock, upgrades to Smart-Ready cylinders have begun. If you have a Smart-Ready cylinder and are interested in an upgrade**, please enter your details our registration page. Once registered, Rinnai will be in contact.

** There will be a charge for the difference between the cost of a standard cylinder and a smart cylinder, Rinnai will cover the labour cost.

Suitable for residential indoor water heating applications—mains and low pressure systems.

A Smart cylinder is ideal for households that have a regular pattern of hot water use, as consistency is key. Also there is some interaction needed with the Smart controller, which is mounted on the cylinder. Easy access to the cylinder and controller is important.

Not suitable as a pool or spa heater, or for connection to an open loop solar or hot water heat pump system.

Water quality
Rinnai water heaters are manufactured to suit most New Zealand council water supplies. However some water supplies can have a detrimental effect on the water heater, its operation and life expectancy. Stainless steel cylinders are not suitable for bore or tank water.

Water supplies with a high level of calcium carbonate (hard water) can cause scaling on hot surfaces. We recommend a water temperature of no more than 65 °C to minimise scale build-up. Scale reducing or water softening devices should be considered in hard water areas. The unit is not guaranteed against damage due to scaling.

Codes MP stainless steel

• MS13555030S (135 L)

• MS18055030S (180 L)

• MS25055030S (250 L)

Codes MP enamel

• ME13548830S (135 L)

• ME18048830S (180 L)

• ME25059030S (250 L)

Codes LP stainless steel

• LS13555030S (135 L)

• LS18055030S (180 L)

• LS25055030S (250 L)

Connections Hot and cold water connections ¾ " (20 mm)
Element 3 kW (all sizes) Incoloy 825 alloy sheath element positioned at the bottom of the tank.
Max. working pressure

850 kPa (MP enamel, and SS cylinders)
120 kPa (low-medium pressure stainless steel)

Pressure testing To 15 bar
Thermal insulation CFC-free polyurethane foam, compliant with MEPS standard
Thermostat Cotherm iQuaflex 14 A probe thermostat
TPR valve (mains pressure only) Rating of TPR supplied with cylinder—
factory set to 850 kPa and 90 °C.
 Market release June 2015
Cylinder recovery times (theoretical) Based on a thermostat temp. setting of 60 °C and an incoming water temp. of 15 °C.
135 L 2 hrs 22 mins (3 kW)
180 L 3 hrs 9 mins (3 kW)
250 L 4 hrs 23 mins (3 kW)

Specification summary

Rinnai Smart Cylinders dimensions table


Black ABS plastic safe tray

Black ABS plastic safe tray
Four sizes to choose from. ABS plastic, an ideal rust resistant safe tray solution.

Galvanised safe tray

Galvanised safe tray
Two sizes to choose from. Galvanised safe trays are the traditional hard-wearing drip tray for New Zealand hot water cylinders.

Seismic cylinder restraint kit

Cylinder seismic restraint kit
Indoor cylinder seismic restraint for cylinders up to 740 mm in diameter.

*Typically saves up to 10% on your running costs in comparison to a standard electric hot water cylinder

Energy cost saving references

  1. The savings claim is verified by results from European tapping tests.
  2. The European efficiency testing standard for a hot water system uses “tapping’s”. Tappings are calls for hot water from the cylinder at various times to simulate real life hot water use.
  3. Actual savings made will depend on the installation although savings of up to 10% are typical. 
  4. Savings are influenced by a number of factors including cylinder size, hot water use profile and plumbing system design. 
  5. Savings are made by the reduction of heat loss from the cylinder and all of the associated components in the plumbing, including pipework.

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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