Boiler Manuals for the Keston C36 Combi appliance. C36 Combi Installation, Servicing and User Guide · View Manual Download - 1.08 MBthe user on completion of the installation to ensure compliance with the Gas . Chapter 1 : User Instructions The Keston C36 Combi & C36P Combi Boilers. 9 Jul 2016 View and Download Keston C36 Combi user, installation and servicing instructions online. Modulating Condensing Combination Gas Fired Boiler. C36 Combi FREE BOILER MANUALS. NO REGISTRATION, just download View Keston User Manuals. Keston Boiler Manuals. Listed below are all the manuals for Keston