Mains pressure indoor stainless steel single standard coil for closed loop solar

For connection to closed loop solar systems.

Mains pressure indoor stainless steel single standard coil for closed loop solar

If you're keen on utilising solar energy then this is the hot water cylinder for you! This is the ideal hot water cylinder for locations with frost and very cold temperatures. A unique coil design maximises heat transfer, saving you valuable money on the dreaded power bill. The coil design is created for use with closed loop solar systems**.

Range of sizes
This range of hot water cylinders comes in 190 L, 250 L, and 300 L.

Maximum heat transfer
The coil spirals down and then wraps back up around itself creating a coil within a coil. It is located at the very bottom of the cylinder to allow for maximum heat to be transferred to the water in the cylinder.

Designed for high temperatures
The duplex stainless steel inner cylinder means it can be used in solar systems with high incoming water temperatures.

Peace of mind
This range of hot water cylinders comes with a 10 year warranty and is backed by Rinnai after sales service and support.

* Refer to the owner and installer guide in the 'Technical' tab for full warranty details.
** For closed loop solar systems the heat transfer fluid is circulated through the solar collector on the roof where it is heated by the sun. The heated transfer fluid then passes through the cylinder coil, which acts like a very large element to heat the water.
MEPS compliant Unique foam formulation 10 year warranty

Suitable for:
• Indoor installations
• Mains and low pressure systems
• Connection to closed loop solar systems
• Residential and light commercial water heating applications

Not suitable as a pool or spa heater, or for underfloor heating.

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. 

Single coil lower element
For new builds and renovations connecting to a closed loop solar system, where the homeowner wants constant hot water, whether there is solar gain or not.

Single coil dual element
For new builds and renovations connecting to a closed loop solar system, where the homeowner wants faster recovery times, and to reduce the risk of running out of hot water regardless of solar gain. Cylinder will have higher running costs.

Single coil upper element
For new builds and renovations connecting to a closed loop solar system, where the homeowner relies heavily on solar gain. Upper element is only used to quickly heat water in the top of the cylinder.

Model codes and capacities Refer table below
Construction • High grade duplex stainless steel inner cylinder (refer note below)
• Galvanised steel outer casing
• CFC free polyurethance foam insulation, compliant with NZ MEPS
Connections Hot and cold water connections ¾ " (20 mm)
Coil connections ¾ " (20 mm)
Coil Solar coil (lower coil) 20 mm diameter
Element Incoloy 825 alloy sheath element
• 190 L: 2 kW* or 3 kW
• 250 L: 2 kW* or 3 kW
• 300 L: 2 kW* or 3 kW
* Twin element options available
Thermostat Robert Shaw 30 A contact auto-reset thermostat (red dial)
TPR TPR supplied, factory set to 850 kPa and 90 °C
Weights 190 L = approx. 42 kg (empty), 232 kg (full)
250 L = approx. 48 kg (empty), 298 kg (full)
300 L = approx. 56 kg (empty), 356 kg (full)
Market release September 2017

Mains pressure indoor single standard coil model code table

Mains pressure stainless steel single coil non-thermosiphon dimensions diagram

General properties of duplex stainless steel 2304
Duplex 2304 is a 23% chromium, 4% nickel, molybdenum-free duplex stainless steel whose structure is a balance of ferritic and austenitic. It has general corrosion resistance similar or better than Alloys 304L and 316L but with yield strength nearly double that of austenitic stainless steels. Its duplex microstructure and low nickel and high chromium contents also allows Duplex 2304 to demonstrate improved stress corrosion resistant properties compared to 304 and 316. It is typically suitable for all applications in the -58 °F to 572 °F 
(-50 °C to 300 °C) temperature range and is designed to feature high mechanical strength, good weldability, good corrosion resistance, high resistance to stress corrosion cracking, good machinability, low thermal expansion, good fatigue properties, high thermal conductivity, and easy fabrication.


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.

Compare this...

Compare this

... to other great products

Enquire about a product

We’re happy to help with anything, big or small. Please fill out the short form below and we’ll get back to you within 24 hours.

Please enter your name Please enter your email address Please enter a subject Please enter a message

Where to Buy

Find a Rinnai reseller near you:

Or enter a postcode:

Brochures & Manuals