Patent ID: 7934495

Claim:
A non-thermostatic heating device comprising an insulative flame retardant container adapted to contain a heating source and having a lower closed end, and an upper end comprised of means to hold a material requiring melting or heating, thereon, said device further comprising means for non-thermostatic temperature control to maintain a temperature of the material requiring melting or heating within a predetermined range with continued heating by said heating source, wherein said means for non-thermostatic temperature control means comprises one or more partial heat insulation and heat conduction members positioned between the heating source said means to hold and the material requiring melting or heating, wherein the one or more partial heat insulation and partial heat conduction members provide a top closure for the insulative flame retardant container and wherein said members comprise one or more fully enclosed air volumes wherein the device further comprises a imperforate member configured to vary the fully enclosed air volume of at least one of the fully enclosed air volumes to thereby controllably vary an existing temperature to a desired temperature in the predetermined range.