If you're looking for a heavier duty system, the Pro Series PS-C33 is actually a contractor grade system compared to the Basement Watchdog BW4000.
The main difference between the two is:
1. The BW4000 will handle 3200GPH at 10 feet for the primary pump and 1730GPH at 10 feet for the battery backup. The PS-C33 will handle 3000GPH for the primary and 2400GPH for the battery backup system. A bit less capacity on the primary than the BW4000 but considerably more capacity on the backup pump.
2. The PS-C33 will accept 2 batteries connected in parallel to double the run time. The BW4000 does not give you this option.