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9.7 Condensation drain pipe
The ATAG condensing boiler has the >88% Ecient SEDBUK 2009 for high energy eciency in heating and
domestic hot water. The ATAG wall hung gas red condensing boiler contain a siphonic condensate trap to
collect and realease condensate. The amount of condensate formed is determind by the type of boiler and
the water temperature produced by the boiler.
Condensate pipework.
Use plastic pipework of an internal diameter no less then 19mm ID (typically 22mm OD).
Routing of the pipework,
The condensate pipework must fall at least 45mm per metre away from the boiler, taking the shortest
practicle route to the termination point.
Support the pipe at least every 50 cm for near horizontal sections and 1 metre for vertical sections.
Wherever possible, the condensate pipework should be routed internally to prevent freezing. In order to
minimise the risk of freezing during prolonged very cold spells, one of the following methods of terminating
condensate drainage pipe should be adopted.
Internal pipework
Wherever possible, the condensate drainage pipe should be terminated at a suitable internal foul water
discharge point such as (a) an internal soil and vent stack or (b) an internal kitchen or bathroom waste pipe,
washing machine waste pipe etc. A suitable permanent connection to the foul waste pipe should be used.
Figures 9.7.1, 9.7.2(a), 9.7.2(b) show appropriate connection methods.
The possibility of waste pipes freezing downstream of the connection point should be considered when
determining a suitable connection point - e.g. a slightly longer pipe run to an internal soil stack may be
preferable to a shorter run connecting into a kitchen waste pipe discharging directly through the wall to an
external drain.
Where “gravity discharge” to an internal termination is not physically possible (e.g. the discharge point is
above the appliance location, or access is obstructed by a doorway), or where very long internal pipe runs
would be required to reach a suitable discharge point, the following measures may be adopted.
Use of a condensate pump (to an internal termination):
Condensate can be removed using a proprietary condensate pump (third party delivery), of a specication
recommended by the pump manufacturer. Condensate pump suitable for combined pressure relief valve.
The pump outlet should discharge to a suitable internal foul water discharge point, such as (a) an internal soil
and vent stack or (b) an internal kitchen or bathroom waste pipe, washing machine waste pipe etc. Figure
9.7.3 shows a typical connection method.
A suitable permanent connection to the foul waste pipe should be used and the manufacturer’s detailed
installation instructions for the pump should be followed.
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