They should max out a bit below 6 kW? The H100 SXM5 is 700 w which would place the system at 5.6 kW plus change. Too much for a standard circuit but well within the bounds of a residential appliance.

It's a monolithic 8U rackmount appliance so perhaps a dishwasher would make for a decent size comparison?

Definitely no good if you rent but homeowners should have little to no difficulty. The sort of people interested in such gear usually have multi kW racks already.