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Compared to our old school water heaters, an electric tankless water heater only heats water when you want some.  These new water heaters are popularly known as instantaneous or On Demand Water Heaters.  They’ve been in demand in the market place due to their energy saving efficiency and easy design.  Unlike with a traditional water heater where the hot water is kept within a tank, with the new tankless heater, hot water may only be produced when needed. 

One of the finest qualities of this product is being an energy saver.  When the faucet for hot water is closed, this water heater doesn’t consume electricity unless you use the faucet.  As to the normal water heater, where the water that is kept in the tank needs to be heated and re-heated to be used, unlike the tankless water heater, which only uses electricity when hot water is needed. 

In selecting any kind of electrical tankless water heater, you can select between a central unit, where all points of water supply can be supplied with hot water, or a point of use water heater, for instance, if you plan to only use hot water in the toilet or kitchen.  A central unit is larger than a point of use unit, so it is best to discover a acceptable place to store the unit.  For a point of use water heater, it is often little in size and can be fixed to walls to economize space. 

The theory of the way the hot water is produced is almost the same as the postulate of gas units.  When you attempt to open your faucet, cold water will run into the tankless water heater and then the cold water triggers the heat exchanger in the water heater to turn on. 

Other than being energy efficient, these water heaters can even last up to 20 years which shows how worth while purchasing this product is.