Do Helicopters Have Jet Engines – Some Do, Some Don’t!
Helicopters use turboshaft gas turbine engines once helicopters begin to have over 4 seats. The lightweight, small, gas turbine engines produce more power for their size compared to piston engines and therefore helicopters are able to lift more. This equates to more passengers, cargo & fuel.
Source: Do Helicopters Have Jet Engines – Some Do, Some Don’t! – Pilot Teacher