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Recommendation for an Air -> Liquid Head exchanger?
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BrokenYugo:
I got them working on my desktop, I don't think a plate exchanger would flow well enough, those are built for liquid-liquid and an aluminum air-water intercooler probably wouldn't handle the heat, a naturally aspirated gasoline engine will easily get the pipe dull red hot at the outlet under a heavy load and probably erode an aluminum heat exchanger in the exhaust stream.

You might also consider fabricating something from steel plumbing parts, like a simple length of pipe with a larger one welded over it to form a water jacket. Ideally this would be sloped downward (as to not trap any corrosive condensate) and mounted below the exhaust port (to prevent water going into the engine in the event of failure).
Lord of nothing:
Sadly I dont have any Welding Equitment (yet). How about the Barrel Cooler I post before? Do you mean that is Alu and will not work? Currently I will be start with my (upcoming) Diesel Heater first.
THX!
Miyuki:
None of the Chinese stuff will last
You are getting to exhaust condensation conditions and it is highly corrosive
You need the right kind of stainless steel to withstand it so you have either automotive stuff or condensing boiler heat exchanger
james_s:
While not the most effective solution, a simple method is to wrap some copper tubing around the outside of the muffler. The heat exchanger from a condensing boiler as mentioned above or a tankless gas fired water heater ought to work well too. Keep in mind you will produce condensate just as with a condensing appliance so you'll have to provide a drain for that.
coppercone2:
You will have to measure the pressure drop of the heat exchanger you add to make sure its within the engine spec. I don't know what the engine spec is.

Your probobly gonna end up with corrosion problems if you try to interface anything but pure copper to your water system.

If you do this, add a over pressure valve.
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