Rinnai Stainless Steel Low-Medium Pressure Indoor Hot Water Cylinders

These premium low pressure hot water cylinders are an ideal replacement option.

Rinnai Stainless Steel Low-Medium Pressure Indoor Hot Water Cylinders

Peace of mind
Our range of stainless steel hot water cylinders come 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.

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

- 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 L cylinder has 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. 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. 

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

Code Capacity Diameter Height Element Variant
LS13555020 135 L 550 mm 1015 mm 2.0  kW
LS13555030 135 L 550 mm 1015 mm 3.0 kW
LS18055020 180 L 550 mm 1295 mm 2.0 kW
LS18055020A 180 L 550 mm 1295 mm 2.0 kW ART
LS18055030 180 L 550 mm 1295 mm 3.0 kW
LS18055030A 180 L 550 mm 1295 mm 3.0 kW ART
LS25055020 250 L 550 mm 1740 mm 2.0 kW
LS25055020A 250 L 550 mm 1740 mm 2.0 kW ART
LS250550U20 250 L 550 mm 1740 mm 2.0 kW UE
LS250550U20A 250 L 550 mm 1740 mm 2.0 kW UE, ART
LS25055030 250 L 550 mm 1740 mm 3.0 kW
LS25055030A 250 L 550 mm 1740 mm 3.0 kW ART
LS250550U30 250 L 550 mm 1740 mm 3.0 kW UE
LS250550U30A 250 L 550 mm 1740 mm 3.0 kW UE, ART
LS250550D20 250 L 550 mm 1740 mm 2 x 2 kW DE
LS250550D20A 250 L 550 mm 1740 mm 2 x 2 kW DE, ART
LS250550D30 250 L 550 mm 1740 mm 2 x 3 kW DE
LS250550D30A 250 L 550 mm 1740 mm 2 x 3 kW DE, 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
Outer casing: Galvanised steel
Element Incoloy 825 alloy sheath element positioned at the bottom of the tank.
Operating pressures

Maximim inlet pressure = 120 kPa

Maximum working pressure = 120 kPa

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.
Weights empty/full (approx.) 135 L = 26.5 kg, 161.5 kg
180 L = 31.5 kg, 211.5 kg
250 L = 41 kg, 291 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)

Rinnai low-medium pressure stainless steel dimensions diagram


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.

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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