Since we do not do a lot of drive thru's, parking, or dumpsters and only occasionally bad gum sidewalks we stick to cold water with a portable hot water unit. We run 4-6 4gal/min wheel around pressure washers and station them at different points so we can have 4-6 guys working at the same time. This is almost impossible with a all-in-one rig. I can set up 6 or more guys throughout an apartment complex and pressure wash multiple buildings/roofs/parking garage levels, etc. at the same time.