heat exchangers
The VW ones were air to air; the inner exhaust pipe was cast iron,
like a manifold. The outer part was sheet metal and soon leaked, but
that was not a hazard...it just reduced the output.
I'm hoping to heat water with the exhaust. I saw one once; I assume it
had a tubing coil wrapped around the pipe, but just got a glance at
it years back.
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