Superseded by the Rinnai Mains Pressure Stainless Steel cylinders.
Connect to a hot water heat pump or solar system with the extra eco inlet connection (excl. the 135 L).
Install as a low pressure system then connect, without replacing your cylinder, to the luxury of mains pressure when you are ready.
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 hot water.
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.
|Model / code||Capacity||Element size|
|MS13555020||135 L||2 kW|
|MS13555030||135 L||3 kW|
|MS18055020||180 L||2 kW|
|MS18055030||180 L||3 kW|
|MS25055020||250 L||2 kW|
|MS25055030||250 L||3 kW|
|MS30055020||300 L||2 kW|
|MS30055030||300 L||3 kW|
Hot and cold water connections ¾ " (20 mm)
Inner cylinder- duplex stainless steel
Outer casing - galvanised steel
Incoloy 825 alloy sheath element positioned at the bottom on the tank. Twin element options are available.
To 15 bar
CFS-free polyurethane foam compliant with MEPS standard
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.
Rating of TPR supplied with cylinder—factory set to 850 kPa and 90 °C
Based on a thermostat temp. setting of 60 °C and an incoming water temp. of 15 °C
|Model||2 kW||3 kW||2 x 2 kW||2 x 3 kW|
|135 L||3 hrs 32 mins||2 hrs 22 mins||-||-|
|180 L||4 hrs 44 mins||3 hrs 9 mins||-||-|
|250 L||6 hrs 34 mins||4 hrs 23 mins||3 hrs 17 mins||2 hrs 11 mins|
|300 L||7 hrs 53 mins||5 hrs 15 mins||3 hrs 56 mins||2 hrs 39 mins|
Late 2017 and superseded by the Rinnai Mains Pressure Stainless Steel cylinders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.