Discontinued Product, please contact 0800 RINNAI for more information

Discontinued Product, please contact 0800 RINNAI for more information

HJ Cooper Stainless Steel Mains Pressure Non-Thermosiphon Single Coil Hot Water Cylinders

HJ Cooper Stainless Steel Mains Pressure Non-Thermosiphon Single Coil Hot Water Cylinders

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 glycol 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 electric mains pressure hot water cylinders comes with a 10 year warranty on the inner cylinder and is backed by Rinnai after sales service and support.

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

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


Model Codes and Capacities: Single Coil MS190550C20 = 190 L (2 kW)
MS190550C30 = 190 L (3 kW)
MS250550C20 = 250 L (2 kW)
MS250550C30 = 250 L (3 kW)
MS300550C20 = 300 L (2 kW)
MS300550C30 = 300 L (3 kW)
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)
Coils Solar coil (lower coil) 20 mm diameter
Elements Incoloy 825 alloy sheath element positioned at the bottom of the tank.
• 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
TPR TPR supplied, factory set to 850 kPa and 90 °C
Weight: Single Coil 190 L = approx. 42 kg (empty)
250 L = approx. 48 kg (empty)
300 L = approx. 56 kg (empty)
Superseded September 2017, supeseded by Rinnai branded cylinders
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.
[source: http://www.pennstainless.com/stainless-grades/duplex-grades/duplex2304-stainless-steel/]

Mains pressure stainless steel single coil non-thermosiphon dimensions diagram


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