Ew, inflexible quoting thingy :(
You can get commercial washers the same size as domestic.
Surprisingly, commercial probably use less water than domestic. They only 'use' water for one final rinse whereas domestics can have 4 parts to a wash cycle using fresh water every time.
LOL on the detergent !
The difference is due to completely different approaches to the wash process. Home models are designed to be started and forgotten, washing & 'drying'. Commercial machines don't dry. In the home, there's more chance of stuff being left dirty for longer time - so needs to be soaked with a longer wash cycle to loosen that. Commercial are used with fresh dirt which comes off easily. They also have 'industrial' water sprays - circulating far more water per minute than home machines. Commercials are hotter and use nastier chemicals - often more diluted than home ones.
Commercial machines need time to heat water first possibly an hour before use. Home use "2 trays" per wash, commercial only one.
Sounds like a commercial machine would suit you best BUT consider this: how many domestic machines can you buy for one commercial one ? If you've space for a few machines, consider that option !