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Zoeller M137 cast iron submersible sump pump with vertical float switch

Zoeller

Zoeller M137 1/2 HP 115V Submersible Sump Pump

SKU CH-SCY1-6AW4H MPN M137

A 1/2 HP submersible sump pump with vertical float switch delivering 90 gpm at 5 ft head and 26 ft maximum head

  • TypeDrain Components
  • 1/2 HP motor delivers 90 gpm at 5 ft head
  • Vertical float switch activates at 10 in for automatic operation
  • Cast iron body with bronze impeller resists corrosion in wet environments
  • Carbon and ceramic shaft seal extends pump life by reducing wear
  • Maximum 26 ft head handles deep sump pits effectively

1/2 HP 115V Submersible Sump Pump

The Zoeller M137 is a submersible sump pump rated at 1/2 horsepower and 115 volts AC. It uses a vertical float switch with an integral electrical connection for automatic operation. The pump body is constructed from cast iron with a bronze and cast iron impeller. It is designed for residential drainage and water removal tasks.

Sustained flow at increasing head heights

At 5 feet of head the pump delivers 90 gallons per minute, falling to 79 gpm at 10 feet and 58 gpm at 15 feet. At 20 feet of head the flow rate is 36 gpm before reaching a maximum shut-off head of 26 feet. The motor draws 10.7 amps at 60 Hz during continuous operation. Performance declines steadily as discharge head increases.

Vertical float needs 18 inch pit diameter

Installation requires a minimum sump pit diameter of 18 inches to accommodate the vertical float switch travel between the 2 3/4 inch off point and 10 inch on point. The pump body diameter is 11 3/4 inches. The carbon and ceramic shaft seal resists wear but debris can impede float movement. Buyers needing a tethered switch or a smaller basin should consider a different configuration.

Highlights

  • 1/2 HP motor delivers 90 gpm at 5 ft head
  • Vertical float switch activates at 10 in for automatic operation
  • Cast iron body with bronze impeller resists corrosion in wet environments
  • Carbon and ceramic shaft seal extends pump life by reducing wear
  • Maximum 26 ft head handles deep sump pits effectively

Specifications

TypeDrain Components
BrandZoeller
ModelM137

Questions about this item

How much power does the 1/2 HP motor draw when running continuously?

The motor draws 10.7 amps at 115 V AC, 60 Hz, so it consumes roughly 1.2 kW while pumping.

What discharge piping and electrical supply must be in place before installation?

You need a 1-1/2 inch discharge line and a dedicated 115 V, 60 Hz circuit capable of 10.7 amps with a vertical float switch connection.

Will the pump fit and cycle correctly in an existing 18 inch sump pit?

Yes, the minimum pit diameter is 18 inches, the body is 11 3/4 inches wide, and the vertical float switches on at 10 inches and off at 2 3/4 inches.

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