Water heater - boiler, appliances facilitating everyday life Water heaters and boilers, no matter how hot it is, how much rain, how cold it is, whatever it is, in Malaysia, our home is popular to install a water heater to heat water every season. Time is over when choosing to buy a water heater, or boiler, just for the winter because in our country, winter is almost cold now. The only thing left is the summer heat getting longer and longer.