Alpha - Electronics South Africa Unclaimed

Geyser or intant water heater?are the instant water heaters any better than using a large tank geyser water heater?i am considering looking at substituting those large 150 liter geysers in a house with one of those instant water heaters. i understand that instead of trying to maintain the heat in a large quantity of water all day long it is cheaper to use an instant water heater. apparently the water temperature is the same at the tap when it comes out so one can't tell the difference...