A heating device comprising: a tubular body having a passage therethrough and through oppositely-disposed ends of the tubular body , the tubular body comprising at least an inner layer surrounding the passage and an outer layer surrounding the inner layer , the inner layer being electrically resistive and the outer layer being electrically insulating, the passage being sized and configured to removably receive therethrough a tubing ; electrically-conductive first and second collars secured at the oppositely-disposed ends of the tubular body and functioning as electrical contacts for the inner layer , each of the first and second collars comprising a first tube received in the passage and surrounded by an end of the inner layer at one of the oppositely-disposed ends of the tubular body and a second tube surrounding the end of the inner layer and crimped onto the first tube to sandwich the end of the inner layer therebetween; a temperature sensor coupled to the tubular body to monitor a temperature of the inner layer at a location along a length the inner layer between the first and second collars, the temperature sensor having a junction tip that is located between the inner layer and the outer layer and electrically insulated from the inner layer ; a cord connected to the temperature sensor and exiting the tubular body ; and contact leads located at the oppositely-disposed ends of the tubular body , each of the contact leads being electrically connected to one of the first and second collars and configured to functionally couple with a power source to provide an electrical current to the inner layer , wherein applying an electrical current to the inner layer increases the temperature of the inner layer . a tubular body having a passage therethrough and through oppositely-disposed ends of the tubular body , the tubular body comprising at least an inner layer surrounding the passage and an outer layer surrounding the inner layer , the inner layer being electrically resistive and the outer layer being electrically insulating, the passage being sized and configured to removably receive therethrough a tubing ; electrically-conductive first and second collars secured at the oppositely-disposed ends of the tubular body and functioning as electrical contacts for the inner layer , each of the first and second collars comprising a first tube received in the passage and surrounded by an end of the inner layer at one of the oppositely-disposed ends of the tubular body and a second tube surrounding the end of the inner layer and crimped onto the first tube to sandwich the end of the inner layer therebetween; a temperature sensor coupled to the tubular body to monitor a temperature of the inner layer at a location along a length the inner layer between the first and second collars, the temperature sensor having a junction tip that is located between the inner layer and the outer layer and electrically insulated from the inner layer ; a cord connected to the temperature sensor and exiting the tubular body ; and contact leads located at the oppositely-disposed ends of the tubular body , each of the contact leads being electrically connected to one of the first and second collars and configured to functionally couple with a power source to provide an electrical current to the inner layer , wherein applying an electrical current to the inner layer increases the temperature of the inner layer . <EOS>