end caps a first end cap 62 and a second end cap 64 each of which may also have at least thermally conductive and or radiant properties end caps 62 64 may have any of a variety of shapes sizes and or configurations for example as reflected by first end cap 62 one or both end caps may be sized and shaped to fit over conductive tube 60 in a secure or tight manner alternatively as reflected by second end cap 64 one or both end caps may be sized and shaped so as to fit in conductive tube 60 in a secure or tight manner thus in this preferred aspect of the present invention end caps 62 64 preferably provide additional radiating and or conductive surface area to that already provided by the outer surface of conductive tube 60 in another aspect of the present invention one or more secondary heaters 50 may preferably be operatively associated with one or more radiators 66 for example as shown in fig2 at least one radiator 66 may be press fit onto conductive tube 60 in at least a substantially secure or tight manner alternatively the conductive tube 60 may be integrally formed as part of the radiator 66 each radiator 66 may preferably be made of any of a variety of materials.