Enamel Mains Pressure Indoor/Outdoor Cylinders

Ultimate versatile installation

Can be installed outside or inside

Electric hot water cylinders that can be installed outside your home to free up space for a new spacious kitchen, larger laundry, or that extra storage cupboard.

These cylinders, preset to 65 °C, are fitted with a cTech element, designed to follow the shape of the cylinder, eliminating cold spots and increasing heat efficiency.

A range of sizes and elements to choose from.

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Product Details

Suitable for

  • indoor and outdoor installations
  • mains and low pressure systems
  • residential and commercial water heating applications
  • right hand plumbing connections (90, 135, 180 L)
  • left or right hand plumbing connections (215, 275, 340 L)

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

Not suitable as a spa or pool heater.

Technical Specifications


7 years

IP rating




Codes, capacities, and dimensions
Model Element size Code Diam. (mm) Height (mm)
90 L 2 kW ME090488E20 488 995
90 L 3 kW ME090488E30 488 995
135 L 2 kW ME135488E20 488 1395
135 L 3 kW ME135488E30 488 1395
180 L 2 kW ME180488E20 488 1790
180 L 3 kW ME180488E30 488 1790
215 L 3.6 kW ME215515E36 515 1825
275 L 3.6 kW ME275685E36 685 1265
340 L 3.6 kW ME340685E36 685 1510

High quality glass lined (vitreous enamel) inner cylinder. Sturdy corrosion resistant outer casing, and high density expanded polyurethane foam insulation.


Hot and cold water connections ¾ " (20 mm)


cTech element positioned at the bottom of the cylinder

Pressure limiting valve

500 kPa (approx.) all models

Cold water pressure relief valve

700 kPa (approx.) all models


The thermostat setting is between 60-75 °C. Maximum thermostat setting, in order to maintain the warranty, is 75 °C.


Rating of the TPR supplied with the cylinder is 10 kW / 850 kPa, 99 °C

Model Weight empty Weight full
90 L 44 kg 134 kg
135 L 56 kg 191 kg
180 L 71 kg 251 kg
215 L 83 kg 298 kg
275 L 87 kg 364 kg
340 L 101 kg 441 kg
Cylinder recovery times

Based on a thermostat temperature setting of 60 °C and an incoming water temperature of 15 °C

Model Recovery time 1 Recovery time 2
90 L 2 hrs 38 mins 2 kW (34.3 L/h) 1 hr 45 mins 3 kW (51.7 L/h)
135 L 3 hrs 56 mins 2 kW (34.6 L/h) 2 hrs 37 mins 3 kW (51.3 L/h)
180 L 5 hrs 15 mins 2 kW (34.3 L/h) 3 hrs 30 mins 3 kW (51.4 L/h)
215 L 3 hrs 29 mins 3.6 kW (61.8 L/h) -
275 L 4 hrs 28 mins 3.6 kW (61.7 L/h) -
340 L 5 hrs 31 mins 3.6 kW (61.7 L/h) -

No cylinder wrap required. All Rinnai cylinders meet the NZ Minimum Energy Performance Standard (MEPS).

Market release

Late 2017

CAD/BIM Downloads


In all Rinnai cylinder instructions, we mandate the use of a drip tray. This is because all cylinders have the potential to leak water and cause extensive damage.

Our instructions state: The Rinnai warranty does not cover any consequential loss from leaks to the cylinder, so it’s important a suitably drained drip tray/catch pan is fitted as per AS/NZ 3500.4:2015 5.4 and G12/AS1 6.11.3. Like-for-like replacements are a grey area as most installers will only replace the cylinder to the same configuration as the cylinder that is being replaced. In these instances, Rinnai still maintains that a drip tray should be fitted. This protects the homeowner and the building from any future problems should a leak occur.

If a drip tray cannot be fitted, then look at other possible options such as:
• Locating the cylinder outside
• Using a continuous flow gas hot water heater

  • As the world’s largest gas appliance manufacturer, Rinnai is widely regarded as the industry leader.
  • Rinnai products are known throughout the world for their superior quality, safety, technology and sophisticated control systems, all factories are ISO 9001 and/or ISO 14001 certified.
  • We have an established 40 year history in New Zealand.
  • Rinnai are happy to advise that we now have an IANZ accredited Test Lab for MEPS testing on Hot Water Cylinders. The lab uses the latest in test equipment and can test all type of Hot Water Cylinders for MEPS heat loss testing.

We realise there's a lot of information out there. Water heating is important and it's better to spend the time up front deciding on what you need and what's important.

We have an experienced customer service team that can walk you through the process. For those more complicated projects we also have a free specification service. Give us a call: 0800 RINNAI (0800 746 624)

Installation costs are difficult to provide as every installation is different. Factors such as the length of pipe required, whether you have accessories fitted, how far away you live and choosing an internal or an external unit all influence the overall cost.

If you’re interested in a Rinnai hot water heating solution, we highly recommend you contact a plumber/gas fitter who will be able to explain all the options to you.