BOILER INSTALLATION GUIDE The installation (on the left) includes a 45-degree boiler connection to the breeching, but with a single mitered cut. It does not have an increase in stack diameter as an additional boiler was added and it does not have a 45-degree connection to the stack.
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Step-by-step guide to boiler installation - British Gas
installing boiler condensate discharge pipes Only fit an external boiler condensate drain connection if an internal gravity or pumped connection is impractical to install. The pipe work from the boiler should be of a minimum 19mm ID or as per manufacturers instructions and the