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Wherever possible, the condensate drainage pipe should be routed and
terminated so that the condensate drains away from the boiler under
gravity to a suitable internal foul water discharge point such as an
internal soil and vent stack. A suitable permanent connection to the foul
waste pipe should be used.
*
1
22mm Ø
Fig. 13 Disposal to soil vent stack
Alternatively if the first option is not possible an internal kitchen or
bathroom waste pipe, washing machine waste pipe etc. can be used.
Ensure that the condensate drain pipe is connected "down stream" of
the waste trap.
*
1
100mm
22mm Ø
75mm
Fig. 14 Disposal to a waste pipe
[1]
Condensate discharge from boiler
[4]
Visible air break at plug hole
[5]
Sink or basin with integrated overflow
[6]
75mm sink waste trap
Condensate pump
Where "gravity discharge" to an internal termination is not physically
possible, or where very long internal runs would be required to reach a
suitable discharge point, condensate should be removed using a
proprietary condensate pump, of a specification recommended by the
boiler or condensate pump manufacturer.
The pump outlet pipe should discharge to a suitable internal foul water
discharge point such as an internal soil and vent stack, internal kitchen
or bathroom waste pipe, washing machine waste pipe etc. A suitable
permanent connection to the foul waste pipe should be used.
6720814332 (2018/04)
2
3
4
5
min.
6
*
1
22mm Ø
Fig. 15 Condensate pump disposal
[1]
Condensate discharge from boiler
[4]
Visible air break at plug hole
[5]
Sink or basin with integrated overflow
[6]
75mm sink waste trap
[*]
Condensate trap of 75mm already incorporated into the boiler
3.5.2
External connections
NOTICE: Freezing conditions
▶ Pipe work length should be kept to a minimum and
the route as vertical as possible.
▶ Weather proof insulation must be used.
NOTICE: Condensate waste
▶ Care should be taken when siting a soak-away to
avoid obstructing existing services.
If no other discharge method is possible then the use of an externally run
condensate drainage pipe terminating at a suitable foul water discharge
point, or purpose-designed soak away, may be considered. If this
method is chosen then the following measures should be adopted:
▶ The external run be kept as short as possible and not exceed three
metres.
▶ The pipe should be run internally as far as possible before going
externally and the pipe diameter should be increased to 32mm
before it passes through the wall to the exterior. The pipe should be
insulated using suitable waterproof and weather resistant insulation.
▶ 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 boiler, with no horizontal runs in which condensate might
accumulate.
▶ 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 16 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
boiler condensate outlet and the drainpipe, outside the property, to
avoid flooding during adverse weather conditions.
Pre-Installation
4
5
75mm
min.
6
7
13
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