Tankless water heaters are more efficient than conventional hot water heaters as they only heat what you need, for as long as you need it. When you turn on the tap, a tankless water heater senses the flow and then an electronic igniter starts the heating process. The water flows through the heat exchanger, being heated instantly to the temperature that you select. The hot water is then delivered to the taps that are open. Some of the benefits of installing tankless hot water heaters in your home included savings of up to 70% on your water heating costs savings, greater efficiency throughout the lifetime of the unit and greatly reduced mineral build-up that you get from conventional.