Triton units are available that are powered by either an electric motor or a diesel engine. The electric motor requires that a certified electrician make the hookup, so electric-powered units are generally suited for longer terms installations. If a unit needs to be moved often, then a diesel unit makes sense.
There are operating and maintenance advantages to an electric motor. Diesel fuel is expensive. The diesel engine needs to be refueled and oil levels and filters monitored. In short, diesel engines require more time and attention than electric motors.
Achievement of full Class 1 Division I hazardous rating is easier with an electric unit. And Triton electric vacuum systems run quieter than diesel systems.
Finally, the environmental impact of the power source has become an important issue. An electric motor runs cleaner than a diesel powered engine.