APPARATUS FOR HEATING A FLUID

摘要

A mains-frequency electrically powered fluid heater (2) which includes a coreless transformer and an electrically conductive jacket (3) through which flows the fluid to be heated; the coreless transformer comprises a primary winding (4) electrically insulated from the jacket (3) but at least partially surrounding it, and a seconding winding (5) arranged so as to be linked by magnetic flux from the primary winding (4); secondary winding (5) being electrically insulated from the primary winding (4), but electrically connected to the jacket (3), so that the jacket (3) is heated both by resistance heating and by eddy current heating.