Jensen 20 Model Steam EngineThe Model # 20 is the "Original" Brass & Cast Iron and Steam Engine, designed by Tom, Sr. in 1932. Since our founding, each of these engines has been individually handcrafted by Mr. Jensen and his Son and factory tested to insure maximum performance. Large Capacity Solid Brass Boiler Exclusive Hotwatt 110V. Immersion Heater Massive Cast Iron Engine Base and Axle Journals Heavy Cast Iron Flywheel with PTO "V" grooves High Torque Engine with Double