2.11
CONDENSATE DRAINAGE
Being a condensing boiler, the C45, C40P and C55(P) are fitted with a condensate trap at
the base of the heat exchanger and flue assembly, with facility to connect to a drain point
underneath the appliance.
The connection to the boiler condensate outlet and the condensate discharge pipe work
within the dwelling must be sealed.
Use only plastic piping and do not reduce below 15 mm internal diameter within the
dwelling. Condensate should preferably be drained into the sanitary waste system or,
alternatively, the rainwater system of the property in most cases. Ensure in all cases that
the disposal of the condensate is in accordance with any local regulations in force.
Termination of the pipe must be either at a branch or stack internal to the house, or
externally at an open gully. Alternatively, discharge into a purpose made condensate
soakaway can be considered. Existing or purpose built drains must use suitable corrosion
resistant material as condensate is mildly acidic.
A minimum slope downwards towards the drain of 1 in 20 is essential. Freezing of the
termination and pipework must be prevented. Any drainage pipes outside the property
must be at least 32 mm inside diameter.
WD536
Chapter 2 - Boiler Location
The Keston C45, C40P, C55 & C55P
Installation & Servicing Instructions
Page : 18