Our water heater (30 gal State gas tank, '04 edition) is quite overdue for a flush at bare minimum. I was planning on doing a pressure flush with the hot side closed off, the gas valve set to "pilot", and the cold side left fully open; however, the tank sits below the level of the main drain (as does the rest of the furnace room floor) -- the only gravity drain available for it is via a sump (with the obligatory sump pump).
Is it OK to flush a water heater into a sump pump, or is the risk of clogging the pump with sediment and possibly wrecking it too great? Should I try to route the drain hose "uphill" to the one window in the room and then out the window onto the lawn? Should I route the hose into something that can "catch" the sediment and then drain that container to the sump?