Copy text for instant hot water dispensers list the usual uses: making instant coffee, tea, instant hot chocolate, cup of noodles, dissolving gelatin -- really, any use of a small amount of very hot water. We use it all the time. Some things we use it for that I have not seen mentioned in a manual: heating a screw on lid that is stuck on a jar so that it will twist off easily (remember to protect yourself from the heat by using some insulation like a folded over dish cloth); rinse cleaning something (we often use a mechanical apple peeler that is made of cast iron and other materials. I don't want to immerse it in water, but I do want it clean. I rinse it under the instant hot water which makes the metal so hot that it dries in just a few seconds without rusting). My wife uses it to heat plates. If you want to make rice in a hurry, start with two cups of instant hot water. Use it to heat baby formula in those plastic liners. We also run hot water in used plastic gallon milk jugs and two liter plastic soda bottles making them easy to collapse so they take less room in the recycle bin.

In our guesthouse we have instant hot water integrated with cold water (two levers and one spigot coming out of one hole through the drainboard -- like the top photograph) which makes for a sleeker application.

I've read online about home owners installing these units themselves. Probably Hubwriter Chuck would do it since he replaced his own sink faucet.

At any rate, this is a convenient appliance that saves time for us. If you have one, please leave me a comment on why you like (or don't like) it.