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Zoeller 98-0001 Submersible Sump/Effluent Pump Review

Zoeller 98-0001

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For heavier-duty sump pump operations, the industrial green Zoeller 98-001, also known as the Zoeller M98, ½-HP cast iron submersible sump and effluent pump is a tough act to follow for competitors. The M98 demonstrates why Zoeller sump pumps are so well-known for their efficiency and rugged build. Both motor and pump are encased in a heavy-duty, oil-filled cast iron housing that is hermetically sealed for many years of cool running. It keeps on pumping throughout the wettest winter, spring and fall seasons with zero maintenance.

All external parts including the handle, arm, guard, fasteners and seal assembly are made from corrosion-proof stainless steel. Everything else is protected by a thick, powder-coat epoxy finish with a stylish hammered look. No sheet metal is used in any part of this pump. The motor and pump shaft seals are made from long-lasting carbon and ceramic material.

If you need to move a lot of water, this pump can do it. At a 10-foot discharge height, the M98 puts out 3,660 GPH and 2,700 GPH at 15 feet. It is filter-free but passes up to ½-inch spherical solids easily. The discharge outlet is a 1.5-inch female NPT fitting. A rugged, highly flexible, 15-foot neoprene power cord is pre-installed with a 120VAC 3-prong plug. The motor draws 9.4A running and 29.2A briefly at startup.

An important feature of the M98 compared to other sump pumps is the durable polypropylene vertical float switch, which provides a generous 6-inch float range. That means more water gets pumped per cycle, which is important for smaller sumps and leads to longer motor life.

This not just a good sump pump, it is a great one. For heavy-duty pumping or providing more headroom to your water pumping capacity, the Zoeller 98-001 is an economical, long-lasting investment for your basement. Plug it in and forget it even during the most demanding water flows.

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Zoeller 98-0001 Details:

Pump type:Corded electric submersible sump/effluent pump
Manufacturer:Zoeller Pumps
Float/Switch type: Non-adjustable, external vertical float, 6-inch travel
Cord length:15 feet
Inlet style:Bottom suction, handles spherical debris up to ½-inch diameter
Discharge size:1.5 inches NPT
Housing material:Cast iron
Base material:Cast iron
Recommended sump diameter:12-inch minimum, wider is better
Motor:½ horsepower, oil-filled, hermetically sealed, carbon/ceramic seals
Voltage/Amperage: 115VAC/9.4A, 29.2A startup
Pumping Capacity:3,660 GPH @ 10-foot head, 1,500 GPH @ 20 feet
Dimensions:12.1 inches high, 7.9 inches wide, 10.1 inches deep
Weight:38 lbs.
Back-flow valve:None
Warranty:3 years

This robust, made-in-the-USA, sump pump by Zoeller is a superb worker that exceeds average needs but lets you relax when an unusually big storm hits. The quality build and design is evident as soon as you take it out of the box. Its heavy, sturdy and absolutely waterproof and corrosion proof. Everything on the outside is either stainless steel or thoroughly coated with a hard epoxy paint. The pump runs very quietly for its size and hooks up easily to standard 1.5-inch discharge plumbing. It is all backed up by a beefy 3-year warranty.

Despite the 6-inch float travel that is factory-set, you will run across a Zoeller 98-0001 review now and then that complains of “short-cycling.” What is happening in this situation is that the GPH of this pump is a mismatch to the sump size. Thus, even with six inches of travel, there is probably a gallon or less of water surrounding the pump, which it discharges in seconds not minutes. To avoid this, the sump should be enlarged.

Another issue with this formidable pump is the high starting current. Although most buyers run it off a dedicated 15A 115VAC circuit, which is fine for a 9.4A running current, that size circuit is not code for the 29.2A starting current. To be safe and avoid random breaker trips, a dedicated 10AWG/30A circuit should be supplied with a 30A-style outlet. The last thing you need is a tripped breaker on a dark, wet night when you are away from home.

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4.8 Overall
  • Strong, ½-HP performance
  • Well-engineered build with top-quality components
  • Oil-filled, runs cool
  • Should have a dedicated circuit to handle high startup current
Value for the Money

You can buy a good sump pump for less money, but it will not have the built-in high-quality and high-performance of the Zoeller M98. This pump is designed from the inside out to handle the toughest residential water removal jobs. It moves a lot of water and moves it fast without faltering. It costs nearly twice what a decent 1/3-HP sump pump does but provides more than twice the value by handling extreme inflows without strain. That is a small price to pay to maintain a bone-dry basement and enjoy a sound night’s sleep.

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