or a tip over sensor can nevertheless be utilized fig6 shows an example of another thermal transfer component 106 that illustrates how different heating regions 191 and 192 of a heating channel can have different heating levels for example the heating element 163 can have different resistance per unit length in the region 191 compared to the region 192 in this example the heating level in the center of the thermal transfer component 106 can be designed to be higher than the periphery to this end the region 191 can indicate where the heating element 163 has a higher resistance per unit length for example by having a higher wrapping density the region 192 can indicate where the heating element 163 has a lower resistance per unit length for example by having a lower wrapping density in this way the thermal transfer component 106 can produce more heat in the center which can be transferred to the air by convection while the outside edge of the thermal transfer component 106 is cooler to the touch as shown the heating element 163 can start with a first wrapping density in region 191 within the heating channel 133 change to another wrapping density in region 192 and then transition back to the first wrapping density while two regions 191 and 192 are shown additional regions can be designed and the wrapping density or resistance per unit length can be abruptly or gradually transitioned along the length of the heating element 163 in some examples additional heating elements can be used each with constant or varied resistance per unit length referring back to fig1 the outer thermal transfer components 106 can be designed to have a different heating level than the.