http://www.hoter.co.il/instant-water-heaters-products.htmlThis is the company that made it but I don't see the one I have.
I liked mine so much I bought 2 incase one quit working,
the reasons I think it is perfect for this type use is that the slower the water passes through the heater the hotter the water gets so you use very little water and it gets really hot real fast so you don't waste any water.
I had to buy a water flow tap to control the amount of water that goes through the heater, the way you control the water temp is how fast it goes through the heater.= start out with very little water and increase the water until it's they way you want.
I also had to cut off the plug it came with and install a regular plug.
they are made to be used over a sink so you have to use it with the faucet that goes with the heater, I tried putting a shower head on it and the water passed through to fast and would not heat the water?
But useing it just the way it comes works perfect.