What is a cremation furnace?  A cremation fuenace is also called a: “incinerator“, “cremator” and “cremation oven”. A cremation furnace is used in a crematorium. The cremation or incineration of a dead body is carried out in a cremation furnace at a temperature ranging between 1000 to 1300 degrees Celsius. The intense heat helps reduce the body to its basic elements and dried bone fragments. The cremation process takes place in a cremation chamber, also known as a retort, of a crematory. The chamber is preheated at a set point 800 degrees Celsius and then the coffin with body is placed into the main cremation camber from the cremation furnace.