Running a Waterfall Pump in Winter: Freeze-Protection Strategies

At 4,900 feet in North Reno, NV, winter nights dip into the low 20s (°F). Your 1,500 GPH pump sits just 15–16 inches deep in a lined basin. Can you run the waterfall all winter?

Option 1: Run Continuously (With Vigilance)

• Moving water resists freezing. Monitor for ice dams that divert flow over the liner or cause backups.
• If ice builds but flow persists, you’re okay. If flow drops noticeably, shut down immediately.

Option 2: Seasonal Shutdown (Safer)

• Drain the basin, remove the pump, and store it frost-free.
• Even a submerged, idle pump can crack if water inside freezes.
• Blow out plumbing lines to prevent burst pipes.

Hybrid Approach: Run the pump only during the coldest weeks using a thermostatically controlled outlet (e.g., activates below 35°F). Pair with a floating de-icer in the basin to maintain gas exchange.

Commercial features you see icing up likely have deeper basins, larger pumps, or are simply tolerated as seasonal ice sculptures. For a residential system, err on the side of caution—pump replacement costs outweigh winter aesthetics.