It takes 1.16 hours for a hundred liter electric water heater to heat up.
1. If you want to know how long it takes for a 100 liter electric water heater to heat up, you must first understand the relevant knowledge. The actual temperature increase mainly depends on the base water temperature and the power of the heating tube. For example, if the base water temperature is 20 degrees, and the power of the heating tube is 3 kilowatts when heated to 50 degrees, 100 liters of water will be required. 100 calories for each degree of increase. 3000 kcal of heat, and the calorific value of one kilowatt hour of electricity is 860 kcal. The electricity required to heat 100 liters of water is 3000÷860=3.5 kilowatt hours of electricity. The time required for 3 kilowatts of power is 3.5÷3=1.16 hours.