To provide reliable & safe thruster installations in more boats, we offer modified versions of our DC electric thrusters in watertight housings for use in stern & other locations that may get wet or be exposed to petrol fumes. These thrusters are fully ignition protected (ISO 8846) for use in boats with petrol engines. They have a hermetically sealed composite housing around all electric parts. This provides the ignition protection as no petrol fumes can enter & be ignited by sparks. The other advantage is that the electric parts that could be damaged by water are also covered & protected, making these thrusters the ideal choice for other stern thruster installations where it is difficult to ensure that the thruster will always remain dry. The 210/250TC is designed for yachts from 55 to 78 ft load. It's large, 13.15HP motor & robust gearing generate from 462 (at 21 Volts) to 550lb. (at 24 Volts) of thrust - all in only a 10" tunnel diameter. Like all other Sidepower units, it is loaded with safety features & has a wide range of accessories available to customize any installation to each owner's individual requirements. User Manual Installation Guide