With the rising costs of electricity and conventional methods of heating water, an instantaneous gas geyser can save you immediately. With a gas geyser, you are not paying for your geyser to be kept the water heated all the time. Electrical energy used during this “stand-by mode” can range from 15 to 30 % of the total electrical energy that a tank-based system uses. The gas geyser works with a pulse igniter that ignites the instant you open a hot water tap in your home. Similarly the second you close the hot water tap your gas geyser stops, giving you hot water on demand.