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6
COnDEnSatE DiSpOSaL
6.1
GEnERaL REQUiREMEntS
When in condensing mode the Grant Vortex boilers produce
condensate from the water vapour in the flue gases.
This condensate is moderately acidic with a pH value of around
3.27 (similar to orange juice).
Provision must be made for the safe and effective disposal of this
condensate.
Condensate can be disposed of using one of the following
methods of connection:
internal connection (preferred option)
•
into an internal domestic waste system (from kitchen sink,
washing machine, etc.)
•
directly into the soil stack
External connection
•
into an external soil stack
•
into an external drain or gulley
•
into a rainwater hopper (that is part of a combined system
where sewer carries both rainwater and foul water)
•
purpose made soakaway
All condensate disposal pipes must be fitted with a trap - whether
they are connected internally or externally to a domestic waste
system/soil stack or run externally to a gully, hopper or soakaway.
6.2
COnnECtiOnS
Connections into a rainwater hopper, external drain or gulley
should be terminated inside the hopper/drain/gulley below the grid
level but above the water level.
! CaUtiOn !
Condensate disposal pipes must not be connected
directly into rainwater downpipes or to waste/soil systems
connected to septic tanks.
Condensate should not be discharged into 'grey water' systems
that re-use water used in the home (not including water from
toilets).
It should be noted that connection of a condensate pipe to the
drain may be subject to local Building Control requirements.
100 mm plastic tube
figure 6-1: Purpose made condensate soakaway
page 18
6.3
Condensate disposal pipework must be plastic (plastic waste or
overflow pipe is suitable).
Copper or steel pipe is nOt suitable and MUSt nOt be
used.
Condensate disposal pipes should have a minimum 'nominal'
diameter of 22 mm (¾ʺ) - e.g. use 21.5 mm OD polypropylene
overflow pipe.
Condensate disposal pipes must be fitted with a fall (away from
the boiler) of at least 2.5° (~45 mm fall per metre run).
Where it is not possible for the pipe to fall towards the
point of discharge - either internally into a waste system
or externally to a gulley (e.g. for boilers installed in a
basement), it will be necessary to use a condensate pump.
Condensate disposal pipes should be kept as short as possible
and the number of bends kept to a minimum.
Pipes should be adequately fixed to prevent sagging, i.e. at no
more than 0.5 metre intervals.
6.4
Ideally, external pipework, or pipework in unheated areas, should
be avoided. If unavoidable, external pipework should be kept as
short as possible (less than 3 metres) and 32 mm waste pipe
used to minimise the risk of ice blocking the pipe in freezing
conditions.
The number of bends, fittings and joints on external pipes should
be kept to a minimum to reduce the risk of trapping condensate.
for boilers installed in an unheated area such as a loft,
basement, outhouse or garage, all condensate pipework
should be as 'external'.
the pipework should be insulated using suitable
waterproof and weather resistant insulation.
32 mm waste pipe external to the building
Cement seal
Sealed end
Backfill with 10 mm
limestone chippings
pipEWORK
! nOtE !
! nOtE !
EXtERnaL pipEWORK
! nOtE !
Minimum 2.5 fall
O
Ground level
25 mm
300 mm
400 mm
min.
Two rows of 3 x 12 mm
holes at 25 mm centres
and 50 mm from the bottom
of the tube. Holes facing
away from the property.
Section 6: Condensate Disposal
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