I don't see any point in wrapping a worm around the sewer pipe. All the out going water in the sewer pipe is almost never deeper than 1 inch and does not stay in the pipe for very long unless you have problems.
If a worm were wrapped around the pipe only the edges of the 2 pipes would be in contact, through the walls of the pipes.
The way I propose is more like a heat exchanger.
Quote:
Originally Posted by gtojohn
What would you heat with the waste water?
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Incoming utility water.