Yes, they are, but most single family homes here have either a 150 or 200 amp main. Most families rarely exceed 120 amps, so adding 20-35 amps of intermittent l

Yes, they are, but most single family homes here have either a 150 or 200 amp main. Most families rarely exceed 120 amps, so adding 20-35 amps of intermittent load isn't a problem. On the other hand, tankless electrics often cause a service upgrade unless planned for new construction. Great for us electricians, less great for the homeowner.