Technical data

INSTALLATION
18
The water heater must not be installed in an area with a corrosive atmosphere where chemicals are stored or
where aerosol propellants are released. Remember the air may be safe to breathe, but when it goes through
a flame, chemical changes take place which may attack the water heater.
For a single water heater installation, follow the diagrams on pages 23 and 24. For multiple water heater
installations, follow the instructions on pages 33 to 36.
INDOOR INSTALLATION
The water heater is to be installed at floor level and must stand vertically
upright on a stable fireproof base as acceptable to local authorities. There
are also special requirements in AS 5601 and AS/NZS 5601.1 for water
heaters installed in a garage, an enclosed space and other locations.
Remember all local authorities have regulations about putting water
heaters into roof spaces.
For indoor models the distances set out in the diagram should be
observed. Keep the water heater and flue at least 25 mm clear of walls,
cupboards, timber or any other combustibles and at least 500 mm clear of
curtains and furnishings.
Ventilation
The ventilation of a room or an enclosure such as a cupboard, where the
water heater is installed must comply with AS 5601 or AS/NZS 5601.1.
If the water heater is installed in a room or an enclosure, where the total
thermal input of the water heater and any other gas burning appliance(s)
exceeds 3 MJ / h for each cubic metre of room or enclosure volume, an
adequate air supply must be provided.
For efficient water heater operation allow two permanent openings into
the room or enclosure, each of at least:
66,000 mm
2
for each 110 MJ model
120,000 mm
2
for each 200 MJ model
The distance between the top of the upper opening and the ceiling and the distance between the bottom of
the lower opening and the floor must not exceed 5% of the total height of the room or enclosure.
Secondary Flue
A secondary flue must be installed with an indoor water heater to discharge combustion products outside the
building. The flue design and installation must comply with AS 5601 or AS/NZS 5601.1.
The water heater is supplied with a draught diverter, screwed to the top of the water heater. An adaptor is
also supplied with a 621 275 model. The draught diverter is designed to receive a 125 mm diameter
flue (621 265 models) and a 200 mm diameter flue (621 275 models). The flue installed with a 621 275
model sits inside of the adaptor.
Remove the adaptor (621 275 models) from the packaging at the top of the water heater and insert into
the outlet spigot of the draught diverter cone.
The secondary flue must:
be seated inside of the outlet spigot (621 265 models) or the adaptor (621 275 models) of the draught
diverter.
be self supporting and not impose a load on the water heater.
use a slip joint or similar to allow for disconnection.
be designed to run vertically for the maximum possible distance, and not less than 600 mm, before any
change of direction.
There are particular fluing requirements for a 631 275 model water heater installed with a room sealed
installation kit. Refer to the installation instructions supplied with the kit.
Clearance Requirements
Heavy Duty Gas Indoor Water Heaters