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A gas water heater will always have a flue pipe exhaust coming off the top of the unit. An electric water heater does not.
The reason tankless water heaters saves energy is because you only burn energy when the fixture is actually in use, heating water at the moment of demand. Tankless heaters do not consume energy while idle.
To switch from a gas to electric water heater, start by capping the gas supply. Install your new electric unit in place. Then run an electrical circuit to the breaker panel.
The pros of a tankless water heater include taking up less space, savings on energy costs, and uninterrupted hot water.
The cons of a tankless water heater include additional maintenance, maintenance and repairs are more expensive and they are more expensive to buy.