A method and apparatus for heating a product dispensed from a handheld container having a nozzle for discharging the product from the container utilizes a discharge assembly having a discharge housing that defines a reservoir and is in fluid communication with the nozzle when the discharge assembly is coupled to the container. The closure comprises a first portion including inner and outer parts, and a second portion. The lower portion of the charge accumulation layer is covered by the tunnel insulation layer and the block insulation layer.