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Tankless water heaters are powered by either gas or electricity and only go on when there is demand for hot water, such as when someone turns on a faucet.
http://www.ranker.com/list/select-whole-house-tankless-water-heaters/lesree05,
Pick Up Prices of the Tankless Hot Water Heater
How to Install Tankless Water Heater
Capacity and energy savings
Different Tankless Water Heater Brands Warranty
Clik here to view.

Tankless water heaters are powered by either gas or electricity and only go on when there is demand for hot water, such as when someone turns on a faucet.
http://www.ranker.com/list/select-whole-house-tankless-water-heaters/lesree05,
Pick Up Prices of the Tankless Hot Water Heater
How to Install Tankless Water Heater
Capacity and energy savings
Different Tankless Water Heater Brands Warranty