Discontinued Product, please contact 0800 RINNAI for more information

Discontinued Product, please contact 0800 RINNAI for more information

HJ Cooper Stainless Steel Low Pressure Hot Water Cylinders

HJ Cooper Stainless Steel Low Pressure Hot Water Cylinders
**Superseded in August 2017 by Rinnai's new range of branded cylinders**

A fantastic replacement low pressure hot water cylinder, these cylinders cover your needs from low to medium pressure. Built from high grade stainless steel, this range offers a 10 year warranty.

A range of hot water cylinders (135-250 L) that can be used at low and medium pressure. The 250 L cylinder has the option of a second element for faster recovery making it less likely you'll run out of hot water during high demand periods.

Energy efficient
• Curved element design ensures 98% of water is heated
• No cylinders wraps required, all HJ Cooper cylinders meet NZ MEPS

MEPS = Minimum Energy Performance Standard

Inner tank of hot water cylinder constructed from duplex stainless steel, ensuring high strength and resistance to stress and crevice corrosion.

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

Easy installation
The range of hot water cylinders has triple entry making installation easy.

* Auto reset thermostat option must be ordered
** Excludes the 135 L cylinder

Suitable for:
 • Indoor installations
 • Low and medium pressure systems
 • Domestic and commercial water heating applications
 • Left, right, or bottom plumbing connections
 • Connection to open loop solar or hot water heat pump systems
Not suitable as a pool or spa heater.

Anode Not required
Connections Hot and cold water connections ¾ " (20 mm)
Construction High grade duplex stainless steel inner cylinder 
Galvanised steel outer casing.
Element Incoloy 825 alloy sheath element positioned at the bottom of the tank.
• 135 L: 2 or 3 kW
• 180 L: 2 or 3 kW
• 250 L: 2* or 3 kW

 * Twin element options available
Operating pressures

Maximum inlet pressure - 120 kPa

Maximum working pressure - 120 kPa

Pressure testing To 3 bar
Thermal insulation CFC-free polyurethane foam insulation, compliant with NZ MEPS.
Thermostat Robert Shaw 30 A contact thermostat, manually resettable at 85 °C. Thermostat is upgradable to an auto reset version for solar or hot water heat pump applications.
Weight empty (approx.) 135 L: 29 kg
180 L: 35 kg
250 L: 45 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)


August 2017, superseded by Rinnai's new range of branded cylinders

HJ Cooper low pressure stainless steel models and capacities

mm 135 L 180 L 250 L
A 320 320 320
B N/A 465 465
C 335 335 335
D N/A N/A 1087
E 1015 1295 1740
F ø 550 ø 550 ø 550

Low-med pressure stainless steel cylinder dimensions diagram

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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