It sounds interesting but I don't think I really understand it, it seems to heat the water pretty fast.
Carl2

You hit the nail on the head there Snowy, agreed this is an energy storage system. One of it's main advantages seems to be the ability to recharge the cells many many times, unlike using rechargeable batteries that have a relatively limited amount of recharge cycles, these heat batteries should last for 50 years or more. Impressive.

If everything in the video can be believed and we don't know about price yet but ... one to keep an eye on. Us humans will always need hot water.

This is a really cool application of phase exchange tech that I once thought of as a slightly interesting fad. When Grandma was alive, we had heating pads that used the same phase exchange material. Just click the disk and it started a process that not only generated a fairly large amount of heat, but also looked cool in the process. I'm glad to see that there are more relevant uses for the material.

Modern air conditioning already makes use of phase (or state) exchange, where a compressed liquid (usually freon, of one type or another) is atomized through a tiny orifice while simultaneously being decompressed. Trouble is, this takes energy, since the "boiling point" of whatever material used must be low enough to chill the air effectively enough to be useful, and the lower the boiling point, the more pressure the refrigerant needs to be under to get it to condense into a liquid in order to continue the process. I'm sure that one day we'll find a more efficient way to do this, but this particular technology hasn't changed in almost a hundred years, when we used alcohol to do the same thing back in the early 1900's.