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External Connections
pumped connection is impractical to install.
The pipe work from the boiler should be of a minimum 19mm ID or as per
manufacturer’s instructions and the condensate discharge pipe shall be run in a
standard drainpipe material, e.g. poly (vinyl chloride) (PVC), un-plasticized poly
(vinyl chloride) (PVC-U), acrylonitrile butadiene-styrene (ABS), polypropylene (PP)
or chlorinated poly (vinyl chloride) (PVC-C).
500mm for solid pipe and manufacturer’s recommendations should be followed.
The condensate pipe should be run internally as far as possible before going
externally and the pipe diameter should be increased to a minimum of 30mm
ID (typically 32mm OD) before it passes through the wall. The angle of the pipe
should slope downwards by at least 3 degrees as it passes through the wall to
assist in maintaining a good velocity as the condensate exits the building.
The external pipe run should be kept as short as possible to a maximum of 3
metres, taking the most direct and “most vertical” route to the discharge point,
with no horizontal sections in which condensate might collect.
External Connections
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