Specifications

GAS & ELECTRIC HOT WATER HEATING COLLECTION | 27
Water is heated using an approved fire
as well as an electric element. Water
passes through pipes in the back of the
fire and up a riser pipe into the cylinder
to avoid mixing it with the cold water in
the bottom.
See page 34.
Copper Low Pressure Wetback
Mains Pressure
Non-Thermosiphon.
Twin Coil for Closed Loop Solar and Boiler
Mains pressure with two
coils for connection to a
closed loop solar system
and a boiler heating
system.
Single coil
options available.
See page 30.
Mains and Low Pressure
Open Loop Solar or Hot Water Heat Pump
Electric mains or low pressure cylinder
with an extra eco inlet for
connection to an open
loop solar system or
hot water heat pump.
See pages 28 & 29.
Mains Pressure Thermosiphon
Twin Coil for Wetback and Closed Loop Solar
Mains pressure cylinder with a thermosiphon coil for wetback
and a second coil for closed loop solar.
Single coil options available. See page 31.
Stainless Steel Mains Pressure (Pages 28, 30, 31)
Designed for durability, the quality of these cylinders is so
outstanding they come with a 20 year warranty
(conditions
apply). Lightweight and easy to install this is the fit and
forget electric cylinder. It can be upgraded to solar, hot
water heat pump or wetback too.
Stainless Steel Low Pressure (Page 29)
Designed to last. The quality stainless steel used in the
manufacture of these cylinders means you won’t be
replacing it any time soon. They can also be upgraded to
solar and wetback heating too. These cylinders carry a
10 year warranty
(conditions apply).
Enamel Mains Pressure (Pages 32, 33)
Designed to adapt to your installation needs these
cylinders are available as indoor or outdoor models with a
5 year warranty
(conditions apply). There are under-sink
options available. They can be retrofitted to future proof a
low pressure system or is the standard in mains pressure.
Copper Low Pressure (Pages 34)
Designed for those wanting an economical solution to hot
water. These are the lowest cost cylinders and ideal if you
need a replacement hot water cylinder. The cylinder also
has under-sink options. The warranty on these cylinders is
for 5 years
(conditions apply).
Standard cylinders can be mains or low pressure. Mains pressure is the preferred option as you can
have multiple taps and showers running hot water at once without the flow dropping significantly.
Low pressure systems are common in older homes and typically it will take a long time to run a
bath. Hot water cylinders can be made from stainless steel, enamel or copper. The majority of
New Zealand homes that have an electric hot water cylinder will probably have one of the below.
How HJ Cooper
TM
Standard
Mains Pressure Cylinders Work
Cold water comes in at
bottom of cylinder
Element heats water
Warm water rises
Hot water goes to tap via
the outlet on the top of
the cylinder
How Rinnai Hotflo
TM
Mains
Pressure Cylinders Work
Cold water comes in at
bottom of cylinder
cTech™ element heats
water
Warm water rises
Hot water goes to tap
via upper outlet
Thermosiphon effect is when warmer water rises and cooler water falls, creating a natural flow.
Please note: The drawings in this catalogue are representative only and should not be used as
an installation guide. Please refer to standard AS/ NZS 4012, AS/NZS4013 and NZS4603 for the
latest information. All installations must be in compliance with the New Zealand building code.