Re: Evinrude5hp salt water
Naturally, almost all outboards (with the exception of Briggs & Stratton) can be operated in salt water.
I only see one part number for the thermostat, so I would have to say no, there is only a salt water thermostat. I really don't see why they would ever have two different ones anyway.
If you're curious, you can have a look for yourself here:
http://epc.brp.com/default.aspx?brands=ej&lang=e
You will have to look it up as a Johnson though, as there is no such thing as an 2007 Evinrude 5hp in North America.