Use a Gas Geyser or change to a Gas Water Geyser With Hilltake Gas Geyser today! With the rising costs of electricity and conventional methods of heating, a gas geyser can save you money month on month. With a gas water heater, you are not paying for your geyser to be kept hot all the time, as this gas geyser system works with a pulse igniter that ignites the instant you open your hot water tap. Similarly the second you close the hot water tap your gas water heater stops. This is the most efficient method of hot water systems.