In a certain solar house, energy from the Sun is stored in barrels filled with water. In a particular winter stretch of five cloudy days, 1.00 X 10^6 kcal is needed to maintain the inside of the house at 22^οC. Assuming that the water in the barrels is at 50^οC and that the water has a density of 1.00 X 10^3 kg/m^3, what volume of water is required?