Anybody use one (or more) of these? We're looking into options for our hot water needs. If we went with tankless, it would have to be electric, as gas is out of sight around here.

I read a couple of FAQ's on them, and the bottom line seems to be that they work IF you use them as a backup to solar, or if your HW demands are fairly minimal. One place specifically said that tankless WOULD NOT meet our requirements. I only specified electric, no solar, and the need to do two hot water related tasks at the same time, such as run a dishwasher and the clothes washer at the same time.

So far, I'm not impressed by the concept, but I'd like to hear from folks that have them, specifically addressing initial cost, operating expenses compared to conventional hot water, and whether or not they are up to the task.

Thanks in advance for any responses.