It's actually pretty close Zach. The main 257, 1/3HP pump is rated at 2250GPH at a 10 foot head lift while the 441 backup pump is rated at 1830GPH. In most cases, the backup pump will have a slightly lower pumping capacity than the main or primary pump. Also, since the backup pump is powered by 12 volts, the pumps are generally only rated in GPH capacity and not in HP.