The Firelog burns for about two (2) hours, and increases the probability of successfully lighting a fire by 7%. Used exclusively, a 'full' fire will have a heat of about 21 degrees Celsius on average, indeed not much heat. A great fuel source for a fire, at least if you consider the burning duration. Not as good as cedar, weight-wise. At two kilos each, these will weigh you down and are not really practical outside of your main shelter.