Designed to deal with much heavier snowfalls, deeper drifts,and capable of clearing larger premises including larger drives, forecourts, smaller car parks or goods yards, commercial walk-behind snow blowers are always self-propelled and petrol powered.
Commercial walk-behind snow blowers will have very powerful freeze resistant engines and deliver larger clearing widths of perhaps 70 centimetres and more. They will often have advanced driving systems like hydrostatic drives so there is no gear changing and operation is smoother and easier.
These models tend to have more high-end features such as headlights and remotely controlled snow exit chutes for convenience and versatility. (See image below for example)