The condensate drain from a condensing boiler is a bit of a pain. We are replacing the toilet at the same time in the room where the boiler is situated so hope to make some provision for a boss on the soil pipe. Otherwise it means taking the 22mm plastic condensate pipe outside to the nearest drain (or digging it's own soakaway). If this pipe goes outside then it will need insulating to prevent freezing in cold weather because if it it gets blocked with ice the boiler will shut down (not even a limp home mode!).
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