I put in a lot of electric tank less heaters the problem is that they have to be wired with #6 gauge wire 60amps the old heaters are #10 gauge 30amps. Which can get pricey to install but people love the fact that they think there going to save so much money on the electric bill and gain two square feet of storage. Which you're not going to save very much the unit is drawing like 40amps as soon as you turn the water on the lights dim in the whole house because of the amp draw. The real problem is the units don't last because there undersized they really are made for a point of use type not the whole house. But that's what everyone puts in because that's the only feasible option for electric tank less what is really need is the 100amp model but its super expensive. After a little while the homeowner hates the tank less and all plumbers know there junk, just stay away from electric tank less. We have some natural gas heaters here but that's only in the really old neighborhoods. The best set up would be a natural gas tank less, our crappy water doesn't help much either.