A water heater provides hot water for the household and is an insulated steel tank filled with an acid solution called 'water glass'. This solution heats up and stores the energy to provide warmth when it's needed. A gas burner or solar panels which use either natural or man-made gas create just enough heat to keep the water at a set temperature.
The right water heater for each household depends on several factors such as climate, average electricity and gas prices in your area, how often you use hot water, and the size of your home.