Quoting sections from various interested bodies and the manufacturers is all very well, but every job is unique and has its own idiosyncrasies. A 'one size fits all' policy just doesnt apply. I didnt think anyone was saying the condensate couldn't be run internally, but there are and will be instances where the installer has no choice but to run an external condensate drain.
Friends of mine have a Worcester 9.24 electronic. Whilst working at the moment, they have accepted it may soon be reaching the end of its useful life. It is located in the understairs cupboard, ideally any new boiler will need to be sited in the same position. If a condensing boiler was to be fitted, there is no alternative but to take the condensate drain through the external wall and along to a rainwater pipe. An internal route is simply not an option due to the layout of the property.
Friends of mine have a Worcester 9.24 electronic. Whilst working at the moment, they have accepted it may soon be reaching the end of its useful life. It is located in the understairs cupboard, ideally any new boiler will need to be sited in the same position. If a condensing boiler was to be fitted, there is no alternative but to take the condensate drain through the external wall and along to a rainwater pipe. An internal route is simply not an option due to the layout of the property.