Open as PDF
The condensate discharge hose from the boiler must have
a continuous fall of 2.5
and must be inserted by at least
50mm into a suitable acid resistant pipe - e.g. plastic waste or
over ow pipe. The condensate discharge pipe must have a
minimum diameter of 22mm, must have a continuous fall and
preferably be installed and terminated to prevent freezing.
The discharge pipe must be terminated in a suitable position:
i) Connecting into an internal soil stack (at least 450mm above
the invert of the stack). A trap giving a water seal of at least
75mm must be incorporated into the pipe run, there also
must be an air beak upstream of the trap.
ii) Connecting into the waste system of the building such as
a washing maching or sink trap. The connection must be
upstream of the washing machine/sink. If the connection is
downstream of the waste trap then an additional trap giving
a minimum water seal of 75mm and an air break must be
incorporated in the pipe run, as above.
iii) Terminating into a gully, below the grid level but above the
iv) Into a soakaway
Note: If any condensate pipework is to be installed externally
then it should be kept to a minimum and be insulated with a
waterproof insulation and have a continuous fall. The total length
of external pipe used should not exceed 3 metres.
Some examples of the type of condensate terminations can be
1. Internal termination of condensate drainage pipe to internal
2. External termination of condensate drainage pipe via internal
discharge branch (e.g. sink waste) and condensate siphon.
3. External termination of condensate drainage pipe via internal
discharge branch (e.g. sink waste - proprietary tting).
4. External termination of condensate drainage pipe via
External pipe length
max. 3 metres
(must be insulated)
Push t the exible condensate pipe into the outlet spigot on the
appliance. Cut to length and locate outlet into a tundish