Keston 86-CM-44 User, Installation And Servicing Instructions page 24

WD388/0/2004 Chapter 3 : Boiler Location
The connection to the condensate drain of the boiler, and the condensate drain pipework
itself, should be properly sealed to ensure there is no possibility of leakage into the
dwelling.
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.
Installation & Servicing Instructions
The Keston C36 Combi & C36P Combi Boilers
Page : 19