#2 Zoeller M98 1/2 HP
The Zoeller M98 Primary Submersible Sump Pump is extremely durable. Its housing, volute and impeller are made of cast iron for long life and quiet operation. This pump, like the M53 comes highly recommended by plumbers and contractors. The cast iron used is very strong and the pump weighs 35 pounds. This means it will not move it the pit easily.
Even though its 1/2 HP it is as powerful as any 3/4 HP made by many other manufacturers. At a 10 foot lift it will pump 3660 GPH. It has a shut off head of 23 feet.
The float will activate the pump when the water is 9 1/2 inches from the bottom of the pump and will shut off at 3 inches. This pump is for those who get a heavy volume of water coming into the sump pit. The float switch needs to be replaced every 3-5 years depending upon amount of usage. The float is the first thing to go in most all pumps. But replacement switches are available (Part no. Zoeller 04892)
The non-clogging design, a vortex impeller, prevents it from getting clogged unless thjere are solids greater than 1/2 inch.
The pump cord is 15 feet with a 3-wire neoprene cord. A dedicated circuit should be used to ensure fuses will not blow.
The float is two-pole which means it is attached by a pole arm on the top and bottom. This gives the float more stability. The float is solid; therefore it cannot be punched and allowing water to sink it.
All screws, float guard, handle arm and seal assembly are made of stainless steel to prevent corrosion.
The pumps discharge port is 1 1/2 inches NPT. To install this pump with a 2 inch discharge piping system, just buy a 1 1/2 inch to 2 inch adapter. The 1 1/2 inch end is screwed into the M98 discharge port.
If the Zoeller M98 is installed in an 18 inch diameter pit, there should still be room to install a narrow battery backup pump. Its widest part is 10.5 inches. If a backup sump pump is installed you can use the same discharge piping system as long as the backup pump discharge is hooked in with a 45 degree elbow and its own check valve.
This pump is popular for those whose current sump pump runs frequently and often works hard during a heavy rain storm.
This pump like other submersible sump pumps operate best in a sump pit liner. Sump pit liners eliminate debris falling from the sides and that which is loose on the bottom.
The M98 must be installed with a check valve. The check valve will prevent water from running back down the discharge pipe and back through the pump into the sump pit and cause the pump to keep pumping the same water over and over.
It is important to check the discharge piping system to make sure it does not freeze in the winter. If it freezes the pump may keep running and running. If that is the case, unplug the pump until the discharge pipe becomes unthawed.
Since the M98 has high pumping capability it is recommended that only solid PVC discharging piping is used. The pump should not be used with flexible tubing.
It is recommended that you do not remove the existing float and operate the pump with another external float. The existing float that comes with the pump is electronically and mechanically calibrated to turn the unit on when needed.
The price range for this pump is from $180 to $235 depending upon where you buy it.
Cast Iron Vertical Float 3150 GPH @ 10 ft 1 yr Warranty 1 1/2 in. Discharge.