> looking for a small metal garden sprayer (that can be directly heated) rather
> than my solar heated sprayer I use for shower

Is this what you're looking for?


http://www.hotcampshowers.com/campfire___stovetop

Of course, Coleman has made propane showers for years; a battery-powered submersible pump in a pot of hot water would do the trick, too. Not hand-powered, of course, so you have to have batteries.