Rinnai Stainless Steel Mains Pressure Indoor Hot Water Cylinders

Constructed from high grade duplex stainless steel and packed with features to benefit specifiers, installers and homeowners, making them exceptional value for money.

Rinnai Stainless Steel Mains Pressure Indoor Hot Water Cylinders

Peace of mind
Our range of stainless steel mains pressure hot water cylinders comes with a long 10 year limited warranty on the cylinder*. It's backed by Rinnai after sales support and like all our cylinders they are NZ designed and engineered.

Future proof your home
Connect to a hot water heat pump or solar system with the extra eco inlet connection** now or in the future.

Install as a low pressure system then connect, without replacing your cylinder, to the luxury of mains pressure when you are ready.

Energy efficient
- Curved element design ensures 98% of the water is heated
- Cold water inlet tubes deliver water to the bottom of the cylinder to avoid mixing water
- No cylinder wraps required, all Rinnai cylinders meet the NZ Minium Energy Performance Standard (MEPs)
- Smart cylinder option also available

Convenience
- Lightweight, stainless steel makes transport and installation a breeze
- Low maintenance, no sacrificial anode to maintain
- Auto reset thermostat option means these cylinders can be solar or hot water heat pump ready

Innovative design
The 250 and 300 L cylinders have the option of a second element making recovery times quicker and making it less likely you'll run out of water.

* Please see the owner and installer guide in the 'Technical' tab for full warranty details
** Excludes the 135 L cylinder
Designed & engineered in NZ MEPS compliant Unique foam formulation 10 year warranty

Suitable for:
• Indoor installations
• Mains and low pressure systems
• Domestic and commercial water heating applications
• Left or right hand plumbing connections
• Connection to open loop solar or hot water heat pump systems

Not suitable as a pool or spa heater.

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.

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. 
 

Rinnai Stainless Steel Mains Pressure Indoor Hot Water Cylinders

Rinnai Stainless Steel Mains Pressure Indoor Hot Water Cylinders

Rinnai Stainless Steel Mains Pressure Indoor Hot Water Cylinders

 
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HJ Cooper Stainless Steel Low Pressure Hot Water Cylinders

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Within the mains pressure stainless steel range there are different element sizes, configurations, and thermostat options. For further details refer to the 'Mains Pressure Cylinder Duplex Stainless Steel section in the Storage Electric Hot Water Pocket Guide.


Code Capacity Diameter Height Element Variant
MS13555020 135 L 550 mm 1015 mm 2.0  kW
MS13555030 135 L 550 mm 1015 mm 3.0 kW
MS18055020 180 L 550 mm 1295 mm 2.0 kW
MS18055020A 180 L 550 mm 1295 mm 2.0 kW ART
MS18055030 180 L 550 mm 1295 mm 3.0 kW
MS18055030A 180 L 550 mm 1295 mm 3.0 kW ART
MS25055020 250 L 550 mm 1730 mm 2.0 kW
MS25055020A 250 L 550 mm 1730 mm 2.0 kW ART
MS25055030 250 L 550 mm 1730 mm 3.0 kW
MS25055030A 250 L 550 mm 1730 mm 3.0 kW ART
MS250550D20 250 L 550 mm 1730 mm 2 x 2 kW DE
MS250550D20A 250 L 550 mm 1730 mm 2 x 2 kW DE, ART
MS250550D30 250 L 550 mm 1730 mm 2 x 3 kW DE
MS250550D30A 250 L 550 mm 1730 mm 2 x 3 kW DE, ART
MS250550U20 250 L 550 mm 1730 mm 2 kW UE
MS250550U20A 250 L 550 mm 1730 mm 2 kW UE, ART
MS250550U30 250 L 550 mm 1730 mm 3 kW UE
MS250550U30A 250 L 550 mm 1730 mm 3 kW UE, ART
MS30055020 300 L 550 mm 2045 mm 2 kW
MS30055020A 300 L 550 mm 2045 mm 2 kW ART
MS30055030 300 L 550 mm 2045 mm 3 kW
MS30055030A 300 L 550 mm 2045 mm 3 kW ART
MS300550D20 300 L 550 mm 2045 mm 2 x 2 kW DE
MS300550D20A 300 L 550 mm 2045 mm 2 x 2 kW DE, ART
MS300550D30 300 L 550 mm 2045 mm 2 x 3 kW DE
MS300550D30A 300 L 550 mm 2045 mm 2 x 3 kW DE
MS300550U20 300 L 550 mm 2045 mm 2 kW UE
MS300550U20A 300 L 550 mm 2045 mm 2 kW UE, ART
MS300550U30 300 L 550 mm 2045 mm 3 kW UE
MS300550U30A 300 L 550 mm 2045 mm 3 kW UE, ART


ART = auto reset thermostat

DE = dual element
UE = upper element

















































Anode Not required
Connections Hot and cold water connections ¾ " (20 mm)
Construction Inner cylinder: High grade duplex stainless steel (refer note below)
Outer casing: Galvanised steel
Element Incoloy 825 alloy sheath element positioned at the bottom of the tank.
Maximum working pressure 850 kPa
Pressure testing To 15 bar
Thermal insulation CFC-free polyurethane foam, compliant with MEPS standard
Thermostat Robert Shaw 30 A contact thermostat, manually resettable at 85 °C. Thermostat can be upgraded to an auto-reset thermostat for solar and hot water heat pump applications.
TPR valve Rating of TPR supplied with cylinder—
factory set to 850 kPa and 90 °C.
Weight empty (approx.) 135 L = 29 kg
180 L = 35 kg
250 L = 45 kg
300 L = 53 kg
Cylinder recovery times (theoretical)

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

135 L

3 hrs 32 mins (2 kW), 2 hrs 22 mins (3 kW)

180 L

4 hrs 44 mins (2 kW), 3 hrs 9 mins (3 kW)

250 L

6 hrs 34 mins (2 kW), 4 hrs 23 mins (3 kW)

3 hrs 17 mins (2 x 2 kW), 2 hrs 11 mins (2 x 3 kW)

300 L

7 hrs 53 mins (2 kW), 5 hrs 15 mins (3 kW)

3 hrs 56 mins (2 x 2 kW), 2 hrs 39 mins (2 x 3 kW)

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/]


Rinnai mains pressure stainless steel dimensions diagram

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