My drain is in a corner about 6ft away from the arch. Most of the hot water we get from the steam hood and pre-heater is saved in buckets for cleaning hydros etc while boiling and wash up later.
Most of the time, at the end of a boil, I pour it out onto the floor and squeegee on out an open door. It's still hot - not enough to do any damage to the pvc drain pipe - but sure does a nice job cleaning up the place!

I have a 1" hose that runs to the drain from a Y Valve for cleaning the head tank and another that I can hook up to the flue or syrup pans for cleaning. Your place is much bigger so a drain in the corner may not work so well.