Rinnai Low Pressure Copper Indoor Hot Water Cylinders

Manufactured in NZ since the 1930's.

Rinnai  Low Pressure Copper Indoor Hot Water Cylinders

Range of sizes
Extensive range of capacities (9-225 L) and sizes means hot water cylinder replacement is easy.

Custom built options are available.

Energy efficient
No cylinder wraps required, all cylinders meet NZ MEPS.

Easy installation
Connection to existing plumbing is easy with triple inlets, just choose left, right, or bottom for your cold water inlet.

Undersink range
Perfect if you need a little extra hot water—four sizes available 9-44 L.

Wetback options
Many wood, pellet fires, or burner systems can have a wetback fitted to them. A wetback can work as a valuable supplement to your hot water system.

Designed & engineered in NZ MEPS compliant Unique foam formulation 5 year warranty

Suitable for:
- low pressure indoor residential and commercial water heating applications
- maximum operating pressures up to 76 kPa
- left, right, or bottom plumbing connections

Not suitable as a pool or spa heater.

Anode Not required
Connections Hot and cold water connections ¾ " (20 mm)

High grade copper inner cylinders.

Galvanised steel outer casing.

Element Low watt density nickel plated copper, 1.25 " BSP boss.
Operating pressures

Maximim inlet pressure = 76 kPa

Maximum working pressure = 76 kPa

Thermal insulation CFC-free polyurethane foam, compliant with MEPS standard
Thermostat standard 7 " Cotherm probe 20 A over-temperature thermostat. manually resettable at 85 °C
Thermostat wetback 7 " Cotherm prove 20 A (no over-temperature)
TPR valve Not applicable
Weights empty/full (approx.)

9 L = 7 kg / 16 kg

14 L = 8 kg / 22 kg

22 L = 9 kg / 31 kg

44 L = 11 kg / 55 kg

90 L = 16 kg / 106 kg

135 L = 21 kg / 156 kg

180 L = 26 kg /206 kg
225 L = 31 kg / 56 kg

Cylinder recovery times (theoretical)

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

9 L

37.8 mins (1 kW)

14 L

44.4 mins (1 kW)

22 L

1 hr 10 mins (1 kW)

44 L

1 hr 10 mins (2 kW)

90 L

2 hrs 22 mins (1 kW)

135 L

3 hrs 32 mins (2 kW

180 L

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

250 L

4 hrs 23 mins (3 kW)

Copper undersink with top inlet (LCUS codes)

Rinnai low pressure copper undersink dimensions diagram and table

Copper standard/wetback with triple inlet (LC codes)

Rinnai low pressure copper dimensions diagram and table


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.

Seismic cylinder restraint kit

Cylinder seismic restraint kit
Indoor cylinder seismic restraint for cylinders up to 740 mm in diameter.

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. 

Architects Portal

*Architects* Portal

Are you an Architect, Designer or Specifier?

We have everything you need to support your design process including CAD & BIM content. Check out everything you need from one easy Architects and Designers portal.

Enquire about a product

We’re happy to help with anything, big or small. Please fill out the short form below and we’ll get back to you within 24 hours.

Please enter your name Please enter your email address Please enter a subject Please enter a message

Where to Buy

Find a Rinnai reseller near you: