Basement Watchdog Big Dog Backup Sump Pump (2200 GPH @ 10') & Battery. The Basement Watchdog Big Dog is the Goldilocks of backup sump pumps. It's not too small and not too expensive, that’s why it receives our “Best” recommendation. It provides plenty of power to drain your sump pit up to 7.5 continuous hours. Since your pump starts and stops, it can actually backup your pit even longer.