Electrical resistance heating elements are provided which are useful in heating fluid mediums, such as air and water. The heating elements include an element body having a supporting surface and a resistance wire wound onto the supporting surface which is connected to a pair of terminal end portions....http://www.google.fr/patents/US5930459?utm_source=gb-gplus-shareBrevet US5930459 - Immersion heating element with highly thermally conductive polymeric coating
Immersion heating element with highly thermally conductive polymeric coating
