Offering exceptional performance and reliability. With a range of slim diameters, they are an easy replacement option for your old electric hot water cylinder. 488 mm and 590 mm diameter cylinders to match traditional NZ cylinder sizes.
Large range of sizes
30-300 L, there's an electric hot water cylinder to suit. Auto reset options for solar and hot water heat pump applications.
• Indoor installations
• Mains and low pressure systems
• Residential water heating applications only
• 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.
HJ Cooper 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.
High performance anode fitted
Hot and cold water connections ¾ " (20 mm)
Inner tank - enamel steel
Outer casing - galvanised steel
Insulation - CFC free polyurethane foam compliant with MEPS
Long-life Superloy 825 alloy sheathed element, incorporated into an easily removable outer plate, should replacement be necessary.
|30 L||1.5 or 3 kW|
|50 L||1.5 or 3 kW|
|90 L||2 or 3 kW|
|135 L||2 or 3 kW|
|180 L Ø 488 mm||2 or 3 kW|
|180 L Ø 590 mm||2 or 3 kW|
|250 L||2 or 3 kW*|
|300 L||2 or 3 kW*|
* twin element options available
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 supplied, factory set to 850 kPa and 90 ºC
To 15 bar
135 L = 44.2 kg, 180 L = 54.5 kg
|Cylinder||1.5 kW or 2 kW||3 kW||Twin elements|
|30 L||1 hr 10 mins (1.5 kW)||35 mins||-|
|50 L||1 hr 56 mins (1.5 kW)||58 mins||-|
|90 L||2 hrs 38 mins (2 kW)||1 hr 45 mins||-|
|135 L||3 hrs 56 mins (2 kW)||2 hrs 37 mins||-|
|180 L||5 hrs 15 mins (2 kW)||3 hrs 30 mins||-|
|250 L||7 hrs 17 mins (2 kW)||4 hrs 51 mins||
3 hrs 39 mins (2 x 2 kW)
|300 L||8 hrs 45 mins (2 kW)||5 hrs 50 mins||4 hrs 22 mins (2 x 2 kW)
2 hrs 55 mins (2 x 3 kW)
late 2017, superseded by Rinnai mains pressure enamel cylinders
If you’ve ever wondered why we call it a ‘Smart’ Cylinder, here’s what makes it so clever.Read Article
What’s the best way to heat your water? Gas or electricity? Continuous flow or a storage cylinder? Low pressure or mains pressure? All your questions are answered here.