I'm aware but I haven't heard people's experiences with them. I ask because I'm shopping for water heating right now and debating the expense of getting 240 run to the water heater for a heat pump.
Electric tankless sounds impossible (yes, I know they exist, I just mean they don't sound like something that should be able to), since the amount of BTUs required to run a gas tankless at peak is absolutely nuts -- tankless gas water-heaters run on 3/4" pipe instead of the normal 1/2" since they need to have so much burst heat. That doesn't sound possible for electric.
I'ma call him Totoraichu.