http://www.hotter-elc.com/instant-water-heaters-products.htmlThe one I use is like the one at the bottom of the page but a older model, it's made to be used at the sink but I use it in my shower, you have to buy a water flow tap to control the water going into the heater, the slower the water goes into the heater the hotter it comes out, it's not perfect but it was less than 100.00 works on 110,ac my Honda 2000 has no problem running it.
I think it's perfect for my use because it's uses very little water, turn the water so it's barely running it get's really hot quick.
I only really rinse off with 16 gallons on board my trailer
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