A progressive cavity pump , comprising: a jacketed stator casing , the jacketed stator casing including a stator heating chamber , a stator assembly , a first flange at an end of the jacketed stator casing , and a rotor rotatably disposed within the stator assembly, the stator heating chamber forming a first space around the stator assembly and configured to receive heating fluid therein, the stator assembly including a wall and a stator segment that forms a helically-convoluted chamber within the wall, and the stator heating chamber being isolated from the helically-convoluted chamber, wherein the wall and the stator segment each comprise a thermally conductive metal material configured to withstand heating fluid temperatures above 200 degrees C, and wherein the wall and the stator segment transfer heat from the heating fluid to a working fluid within the helically-convoluted chamber; and a jacketed inlet body , the jacketed inlet body including an inlet heating chamber , a working fluid chamber in fluid communication with the helically-convoluted chamber, and a second flange at an end of the jacketed inlet body, wherein the inlet heating chamber includes a second space around the working fluid chamber configured to receive the heating fluid therein, and wherein the first flange of the jacketed stator casing and the second flange of the jacketed inlet body are connected and permit extension of the rotor into the working fluid chamber. a jacketed stator casing , the jacketed stator casing including a stator heating chamber , a stator assembly , a first flange at an end of the jacketed stator casing , and a rotor rotatably disposed within the stator assembly, the stator heating chamber forming a first space around the stator assembly and configured to receive heating fluid therein, the stator assembly including a wall and a stator segment that forms a helically-convoluted chamber within the wall, and the stator heating chamber being isolated from the helically-convoluted chamber, the stator heating chamber forming a first space around the stator assembly and configured to receive heating fluid therein, the stator assembly including a wall and a stator segment that forms a helically-convoluted chamber within the wall, and the stator heating chamber being isolated from the helically-convoluted chamber, wherein the wall and the stator segment each comprise a thermally conductive metal material configured to withstand heating fluid temperatures above 200 degrees C, and wherein the wall and the stator segment transfer heat from the heating fluid to a working fluid within the helically-convoluted chamber; and a jacketed inlet body , the jacketed inlet body including an inlet heating chamber , a working fluid chamber in fluid communication with the helically-convoluted chamber, and a second flange at an end of the jacketed inlet body, wherein the inlet heating chamber includes a second space around the working fluid chamber configured to receive the heating fluid therein, and wherein the first flange of the jacketed stator casing and the second flange of the jacketed inlet body are connected and permit extension of the rotor into the working fluid chamber. wherein the inlet heating chamber includes a second space around the working fluid chamber configured to receive the heating fluid therein, and wherein the first flange of the jacketed stator casing and the second flange of the jacketed inlet body are connected and permit extension of the rotor into the working fluid chamber. <EOS>