Our sump pump failed during last June’s major storm. We came home to 2 inches of water in the basement. Sharing what we learned and what we replaced it with.
What failed:
Original builder-installed pump — 12 years old, 1/3 HP no-name submersible. It ran continuously until the motor seized. No warning, no alarm.
What we replaced it with:
- Primary: Zoeller M53 (1/2 HP submersible) — industry standard, well documented reliability. $320 supply.
- Added: Wayne WSS30VB battery backup unit. This is a secondary pump that activates on float if the primary fails OR the power goes out. $280 supply.
- New pit cover (airtight): $45
- Float alarm (standalone buzzer): $25
Plumber’s labour: $380 (replaced pump, installed backup unit, tested both, ran discharge line test)
Total: $1,050
What the plumber told us:
The discharge line was undersized — the original installer used 1.25-inch pipe. He upgraded it to 1.5-inch at the same time (included in the labour). Undersized discharge is a common reason pumps run continuously and overheat.
6-month update:
The primary pump has cycled normally through fall and spring. The backup alarm activated twice during power flickers — exactly as designed. No water.
The $280 backup pump is the single most important addition. It covers both pump failure and power outage — the two most common failure modes.