Electric Versus Gas Tankless Water Heater
How do you rate electric versus gas tankless water heaterr? Purely considering economy, most people prefer gas. They feel gas is much more efficient than electric tankless heaters, as the latter require large amp breakers and wire to operate.
For a whole house application gas water heaters are the least expensive compared to tankless electric water heaters. For electric tankless water heaters probably you would need to run another electrical service for an electric on which most take 180 amps of service.
 SANTON 9 KW Electric Tankless Hot Water Heater US $202.00 
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 AQUAH 18 KW ELECTRIC TANKLESS WATER HEATER US $324.95
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 18 KW Electric tankless hot water heater US $333.99
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 ELECTRIC tankless water heater US $425.00
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 Titan TANKLESS Water HEATER Electric N160 NEW US $315.00
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 Seisco RA-32 Electric Tankless Water Heater 32kw US $890.00
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 Bosch Powerstar Electric Tankless Water Heater US $229.26
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 USA ELECTRIC TANKLESS WATER HEATER 15 KW US $325.00
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However, there are people who are quite comfortable with electric water heaters. Then you must be looking at a good brand , and you need to get the biggest one that you can afford. 24kw or bigger.
Overall both work great. They do operate just a little different than a conventional tank system, but you will get the hang of how they work.
The point against tankless electric water heaters is that you would have to retrofit a lot of electrical work compared to the gas, which require some electrical work. It is pointed out that on new houses in Texas, they cost about $2,000 installed (unit itself is about $1,200). However, the more units that you install the lower the price per unit should be.
Another point in favor of tankless electric water heaters is that they are very safe compared to gas tankless water heaters. They are easy to install and work well. You can fill your tub all the way and never worry about hot water running out. You can have 10 guests over and not worry about the hot water running out! They simply provide endless hot water so you can shower all day if you want and they never run out. So when rating electric versus gas tankless waters, you will find both useful for their individual merits.