We tested four of these pumps, our favorite of which was the Wayne WSS30Vn Basement Backup Sump Pump because of its ease of setup, reasonable price, and high water-pumping capacity.

How they work: Combo units consist of a standard electric sump pump for regular operation and a backup pump that kicks in only when needed. If the main pump malfunctions or power goes out ...

If buyers ask about the sump pump, explain that it’s a protective measure, not a sign of an issue,” he says. “Have ...