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INSTALLATION INSTRUCTIONS
B The external run be kept as short as possible and not
exceed three metres.
B The pipe should be run internally as far as possible
before going externally and the pipe diameter should
be at least 32mm before it passes through the wall to
the exterior. The pipe should be insulated using
suitable waterproof and weather resistant insulation.
B The external pipe should take the shortest and least
exposed route to the discharge point, and should
"fall" as steeply as possible away from the water
heater, with no horizontal runs in which condensate
might stand.
B The use of fittings, elbows etc. should be kept to a
minimum and any internal "burrs" on cut pipe work
should be removed so that the internal pipe section is
as smooth as possible.
FITTING AN EXTERNAL AIR BREAK
• Refer to figure 31 when a rain water down pipe is
used to dispose of condensate.
• An air break must be installed in the 43mm pipe work,
between the water heater condensate outlet and the
drainpipe, outside the property, to avoid flooding
during adverse weather conditions.
8
Fig. 31 Disposal into a rainwater down pipe
Condensate drainage pipe can be run above
or below ground.
Where the pipe terminates over an open drain or gully,
the pipe should terminate below the grating level, but
above water level, in order to minimise "wind chill" at
the open end.
The use of a drain cover (such as those used to prevent
blockage by leaves) may offer further protection from
wind chill.
22
6720646322-12.1V
Pipe drainage will be improved if the end is cut at 45° as
opposed to a straight cut.
8
Fig. 32 External disposal
CONDENSATE SOAK AWAY
• The condensate drainage pipe may be run above or
below the ground to the soak away. The examples
shown on this page run above ground.
• The soak away must use a 100mm Ø plastic tube with
two rows of three 12mm holes on 25mm centres and
50mm from the bottom of the tube. The holes must
face away from the house.
• The tube must be surrounded by at least 100mm of
limestone chippings to a depth of 400mm.
Minimum hole size for the condensate soak
away must be 400mm deep by 300mmØ .
In situations where there are likely to be extremes of
temperature or exposure, the use of a proprietary trace-
heating system for external pipe work, incorporating an
external frost thermostat, should be considered.
However, all other guidance above and the instructions
for the trace heating system, should be closely followed.
NOTICE: Unheated internal areas.
B Internal pipe runs in unheated areas such
as lofts, basements and garages should
be treated as external runs.
6 720 646 322 (2012/05)
6720646322-13.1V
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