I'm in the process of installing a new shower room and toilet upstairs.
At this time of year we get a lot of humidity and toilets sweat. I'm using pex pipe and I have an idea that for the toilet I could use a fairly long length (12'-15') and wrap it around the ABS sewer pipe to pick up heat from showers/wash basin etc through the ABS pipe and maybe stop it sweating so much. I'd insulate the pex round to keep it from sweating itself. Just wondering if anyone has experimented with this kind of thing? Kind of environmentally positive by recycling heat.. rather than feeding hot water into the toilet as well as cold.