Heating value is a measurement that tells us how much energy is released when something is burned. Heating value that is high means that more energy is released when the item is burned, while heating value that is low means that less energy is released. Think of it like a match - the bigger the match is, the brighter the flame and the more heat it will give off. That's why heating value is so important - it tells us how much heat we can get from something when it is burned.