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The trouble with electric tankless heaters comes down to temperature rise. This is the important number you must pay attention to when selecting a tankless heater. Basically, a tankless hot water heater is rated to supply a given amount of hot water at a certain temperature rise.

This means that if the water source is quite cold, electrics have a hard time getting up to temp. Natural gas are much better at this. Here in WA state for example, I could never install an electric for more than a hand washing sink and expect it to be effective.

Your situation could be quite different, but that was my assessment when I started looking at upgrading to a tankless for my house.