Rheem 862 27 Series Service Instructions Manual page 80

Fluing Requirements for internal Models (cont)
Flue Terminal Location
The flue design, installation and termination point must comply with AS 5601. As a guide the
following requirements extracted from the Australian Gas Installations Standard AS 5601,
must be observed for the flue termination.
Horizontal Flue Terminal Location

At least 300 mm between the top of the flue terminal and the eaves.

At least 300 mm between the bottom of the flue terminal and the ground, balcony or other
surface.

At least 500 mm between the flue terminal and the edge of any opening into the building,
measured horizontally along the wall.

At least 300 mm between the flue terminal and a return wall or external corner, measured
horizontally along the wall.

At least 1500 mm between the top of the flue terminal and below any openable window
measured vertically.

At least 1500 mm between the flue terminal and any opening into a building, in the direction of
the flue discharge.

At least 500 mm between the flue terminal and a fence, wall or other obstruction, in the direction
of the flue discharge.

At least 300 mm between the flue terminal and any other flue terminal, cowl or other combustion
air intake.
For a multiple unit installation, a minimum distance between flue terminations must be
maintained to prevent recirculation of flue gases. Maintain a centre to centre distance
between flue terminations of 450 mm.
Vertical Flue Terminal Location

At least 500 mm between the underside of the flue terminal and the nearest part of a non-
trafficable roof.

At least 2000 mm between the underside of the flue terminal and the nearest part of a trafficable
roof designed for personal or public use.

At least 200 mm between the flue terminal and a chimney where the flue terminates above the
chimney.
Horizontal Flue Runs

A horizontal section of flue must be installed with a gradient of 20 mm per metre (1 in 50 or
1° fall) of horizontal run.

The flue pipe must be installed with the seam of the inner
flue pipe toward the top of the installation.

A horizontal run of flue pipe between two bends, where
the bend closest to the flue terminal is orientated
upward, must have a gradient upward in the direction of
the flue terminal.

A condensate trap must be installed as close as
practicable to the flue outlet from the water heater if the
flue is installed with an upward slope and a condensate
trap is not installed immediately after the flue adaptor.

This ensures any condensate formed during operation of the water heater is prevented from
draining back into the water heater.

A horizontal run of flue pipe connecting directly to a horizontal flue terminal must have a
downward gradient to the flue terminal.
This prevents rainwater from entering the flue and draining back into the water heater.
TM049 27L Continuous Flow Service Instructions
REV AL – Issued April 2019
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