First of all, although water heaters may be lowest cost to install, they "leak" or bleed off energy in the form of lost heat over time. Obviously super insulating them can cut some of this loss.
2nd, the "bidirectional control" seems a bit misaligned, water heaters as storage devices cannot give back energy into the grid to lessen overall load, they can only be throttled down to lessen load. Perhaps a solution will be obtained from energy storage salts or thermal electric devices to allow for energy harvesting and conversion ?
2nd, the "bidirectional control" seems a bit misaligned, water heaters as storage devices cannot give back energy into the grid to lessen overall load, they can only be throttled down to lessen load. Perhaps a solution will be obtained from energy storage salts or thermal electric devices to allow for energy harvesting and conversion ?