Question: how much energy does it take to heat 1 litre of water by 1 degree?
Answer: To increase a temperature by 1°C of water, we need a total of 4181 Joules energy. So supposing that the temperature of water is 0°C, 1 atm pressure and 1 liter it will take a total of 418100 Joules of energy. And the real Answer!!