Zoeller M98 - 1/2 HP Cast Iron Submersible Sump Pump w/ Vertical Float Switch

Zoeller M98 - 1/2 HP Cast Iron Submersible Sump Pump w/ Vertical Float Switch
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Model: M98
(Based on expert analysis, manufacturer ratings and customer reviews)
4.7 out of 54.7 out of 54.7 out of 54.7 out of 54.7 out of 5
Number of Reviews (318)
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  • Product Description
  • 318
    Reviews
  • 29
    Product Q&A
  • Recommended Accessories
  • How-To Articles
  • Manuals
Product Description
+
Style
Primary Sumps Pumps
GPH
4320
Gallons
Switch Type
Vertical Float Switch
Style
Primary
GPH
4320 Gallons
Switch Type
Vertical


Product Video Disclaimer: "PED is not responsible for any variances from the product in this video and the item you purchase. Please review all product specs prior to purchase."

Features
Features
  • Automatic Submersible Cast Iron Sump Pump
  • Offers years of reliable, trouble-free operation
  • No Sheet Metal Parts To Rust Or Corrode
  • Stainless steel screws, guard, handle, arm and seal assembly
  • Thermally Protected, Permanent Split Capacitor Motor
  • Oil-filled and hermetically sealed to prevent overheating
  • Vertical Float Switch
  • Solid and buoyant polypropylene design
  • Carbon & Ceramic Shaft Seal
  • Assures maximum protection for extended pump life
  • Powder Coated Epoxy Finish
  • Provides a corrosion resistant exterior
  • Clog-Resistant Design
  • No screen to interfere with flowing debris
  • Capable of passing 1/2" diameter solids
  • Industry Leading Quality Control
  • Entire unit is pressure tested after assembly
Specifications
Base
Base Material
Cast Iron
Min Sump Basin Size
18 Inch
Motor
Voltage
120 Volt
Running Amps
9.4
Thermal Protection
Yes
Power Cord Length
15 Feet
Oil Free Motor
No
Starting Amps
29.2
Pump
Housing Material
Cast Iron
Impeller Material
Plastic
Solids Handling Size
0.5 inch
Handles Solids
Yes
Float Type
Vertical Float
GPH @ 0 feet
4320
GPH @ 5 feet
4320
GPH @ 10 feet
3660
GPH @ 15 feet
2700
GPH @ 20 feet
1500
Discharge Port Size
1-1/2 Inch
Built-in check Valve
No
Float On
9.5
Float Off
3
Manual Override
No
Submersible
Yes
Engine
Horsepower
.5 hp
Overview
Weight
38 Pounds
Product Length
10.125 Inches
Product Width
7.875 Inches
Product Height
12.06 Inches
Consumer Warranty
3 Years
UPC
053514029463
Style
Primary Sumps Pumps
GPH
4320
Gallons
Switch Type
Vertical Float Switch
Style
Primary
GPH
4320 Gallons
Switch Type
Vertical


Product Video Disclaimer: "PED is not responsible for any variances from the product in this video and the item you purchase. Please review all product specs prior to purchase."

Features
Features
  • Automatic Submersible Cast Iron Sump Pump
  • Offers years of reliable, trouble-free operation
  • No Sheet Metal Parts To Rust Or Corrode
  • Stainless steel screws, guard, handle, arm and seal assembly
  • Thermally Protected, Permanent Split Capacitor Motor
  • Oil-filled and hermetically sealed to prevent overheating
  • Vertical Float Switch
  • Solid and buoyant polypropylene design
  • Carbon & Ceramic Shaft Seal
  • Assures maximum protection for extended pump life
  • Powder Coated Epoxy Finish
  • Provides a corrosion resistant exterior
  • Clog-Resistant Design
  • No screen to interfere with flowing debris
  • Capable of passing 1/2" diameter solids
  • Industry Leading Quality Control
  • Entire unit is pressure tested after assembly
Specifications
Base
Base Material
Cast Iron
Min Sump Basin Size
18 Inch
Motor
Voltage
120 Volt
Running Amps
9.4
Thermal Protection
Yes
Power Cord Length
15 Feet
Oil Free Motor
No
Starting Amps
29.2
Pump
Housing Material
Cast Iron
Impeller Material
Plastic
Solids Handling Size
0.5 inch
Handles Solids
Yes
Float Type
Vertical Float
GPH @ 0 feet
4320
GPH @ 5 feet
4320
GPH @ 10 feet
3660
GPH @ 15 feet
2700
GPH @ 20 feet
1500
Discharge Port Size
1-1/2 Inch
Built-in check Valve
No
Float On
9.5
Float Off
3
Manual Override
No
Submersible
Yes
Engine
Horsepower
.5 hp
Overview
Weight
38 Pounds
Product Length
10.125 Inches
Product Width
7.875 Inches
Product Height
12.06 Inches
Consumer Warranty
3 Years
UPC
053514029463
Product Specs
+
Specifications
Base
Base Material
Cast Iron
Min Sump Basin Size
18 Inch
Motor
Voltage
120 Volt
Running Amps
9.4
Thermal Protection
Yes
Power Cord Length
15 Feet
Oil Free Motor
No
Starting Amps
29.2
Pump
Housing Material
Cast Iron
Impeller Material
Plastic
Solids Handling Size
0.5 inch
Handles Solids
Yes
Float Type
Vertical Float
GPH @ 0 feet
4320
GPH @ 5 feet
4320
GPH @ 10 feet
3660
GPH @ 15 feet
2700
GPH @ 20 feet
1500
Discharge Port Size
1-1/2 Inch
Built-in check Valve
No
Float On
9.5
Float Off
3
Manual Override
No
Submersible
Yes
Engine
Horsepower
.5 hp
Overview
Weight
38 Pounds
Product Length
10.125 Inches
Product Width
7.875 Inches
Product Height
12.06 Inches
Consumer Warranty
3 Years
UPC
053514029463
Reviews
(318)
+
Zoeller M98 Reviews & Ratings
91% of Reviewers Recommend This Product
Product Q&A
(29)
+
Search Product Q&A's Answered by Jim, the Sump Pump Expert
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Is the Zoeller M95 a new pump?
Michael 
from Connecticut 
April 07, 2017
Answer
YES, it is Michael! The M95 was just recently introduced by Zoeller as an upgrade to their flagship M98 pump. The new M95 offers an improved switch, pumping capacity, a 15-foot power cord (UL Listed) w/ LED lighted plug end and a FIVE year warranty.
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What is the difference between the M98 and M95?
Dino 
from Illinois 
March 31, 2017
Answer
The M95 is Zoeller's latest, greatest and updated version to the flagship M98 pump. Same dimensions as the M98 but with the following upgrades: Higher pumping capacity, 4800GPH @ 0'hd (compared to M98's 4320GPH @ 0'hd), improved switch for longer life, lighted plug, polypropylene made, a float-operated vertical switch w/ Viton® Switch Boot, and a FIVE Year warranty.
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Is there a big difference between the M53 and M98 when it comes to noise and cycle rate? I have about 12 feet to go up from my sump pit, so would the additional hp help it not run as much with the initial float kick on at 9?"
Aaron H. 
from North Dakota 
March 21, 2017
Answer
Regarding the noise concern, there should not be any difference as long as the pump is installed properly. Regarding your cycle rate, it may actually increase since it will be emptying your basin quicker. It's always best to keep your cycle rates to a minimum when possible. So if the M53 worked well for you and you never came close to flooding, I would suggest keeping that 1/3HP pump in place. IF that M53 had difficulty with demand at any time however, then I would suggest increasing to the 1/2HP model M98.
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What can one expect for your model M53 C to last in terms of years?
Rohn V 
from Ohio 
March 19, 2016
Answer
That's a tough question to answer. Typically, the pump should give you about 5-7 years of life in a standard sump application. That said, I have heard of them lasting 10, 15 and 25+ years in some cases. The switch is the most common reason for failure and can be replaced, though it is a bit involved on the "M" Series models.
If you have any other questions, please let me know.
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What material is the impeller made of.
Skip H. 
from West Virginia 
August 14, 2015
Answer
Non-clogging engineered plastic vortex impeller design. Were you looking for a different material?
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Jim, could you let me know how much wattage the Zoeller 98 1/2 HP motor uses. As I am considering buying a generator for a few items, including the sump pump?? Thank you, Paul
Paul A 
from New York 
November 25, 2014
Answer
The Zoeller M98 uses 9.4 running amps & 29.2 starting amps, which equates to 1128 running watts and 3504 starting watts. Please keep in mind that you should not load up your generator more than 80% at any time as well.
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My Zoller pump has a threaded female connector on the body. What am I expected to put between the pump body and the bottom clamp of this check valve?
BN 
from California 
September 17, 2014
Answer
Typical installations will include the discharge PVC Sch40 pipe screwed into the pump discharge port and extending approximately 2-3 feet above the sump basin cover. At this point, you could attach the check valve and then complete your discharge configuration. This method would allow for an easier access point for you to service your pump.
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Hi Jim, Can I use the Zoeller M98 as an effluent pump. I have seen it listed as a sump/effluent pump elsewhere. I like the Zoeller brand and am looking to use it as a lift pump for a septic tank. Thanks.
Kevin G. 
from North Carolina 
February 13, 2014
Answer
The Zoeller M98 is actually designed for sump, effluent and dewatering application. As long as you are not dealing with any solids larger than 1/2" and you are not exceeding the rated head lift, you would not have any problem.
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Installing an underground sump pump to drain water coming under the house. Was thinking about ordering the following kit, but I am not sure if the basin is the correct one for a sump pump or if we should switch it to something bigger. Zoeller 1050001 13 HP M53 Remote SinkDrain Pump System w Vertical Float Switch Thank you, Nestor Ho
Nestor H 
from Texas 
October 21, 2013
Answer
Thank you for your interest in Sump Pumps Direct. It really depends on how you plan on getting the water into the sump basin. If you are doing a typical basement INSTALLATION, I would advise something more like the Zoeller model M53 or M98, depending on your water table. I would then suggest installing a standard SUMP BASIN and COVER. You can then tie this in to a french drain or you can drill holes in the basin to allow the water to seep through and into the basin for discharge by the pump. If you are looking to install this system outdoors or in a crawl space, the Liberty 1/3 HP Cast Iron Crawl Space Sump Pump Kit, model CSP-257 might be a better choice.
And don't forget the CHECK VALVE.
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I have a Zoeller sub pump 1198 horizontal install, I would like to buy another pump,where this one is quite old. What is the model # I should buy. There is no info on tag that is attached the plug wire. I want to say this pump is at least 30 years old. I have never replaced it. Could you please tell me what I would need to purchase. I don not have any owners manuel on product all I could find was 1198 horizontal Install on pump. Can you please assist me. Thanks, Rebekah
Rebekah T 
from Massachusetts 
June 14, 2013
Answer
Zoeller basically builds 2 models, the 1/3HP model M53 and the 1/2HP model M98. The 1198 number most likely refers to the date code. If you cannot locate the model number in the same area as the date code, the 1/3HP model is about 10" tall and the 1/2HP model is about 12" tall. I would also suggest replacing your CHECK VALVE as well.
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I live on a small man made lake and have a walk out basement. Over the years the water table of the lake has risen to the point that the piers of my deck, approximately 100 feet from the water, have raised my deck about 4 inches. I dug a dry well near the house 2 feet deep. This dry well is constantly filled with water to within 6 inches of ground level. The dry well has underground drain tile running out to near the lake. I want to install a sump pump in the well to extract the water and hopefully keep my deck fro rising. Will the M98 be a good pump for this application or should I be looking at a 3/4 or even 1 HP pump. I expect this pump will run quite often maybe even close to continuously. Thanks for your help. Kurt
Kurt K 
from Illinois 
April 25, 2013
Answer
If you are mainly dealing with clean water and there is no chance of the water freezing with the pump, the M98 or StormPro model BA-50M would be a good choice to start with. Since it's difficult to judge just how much pumping capacity will be needed. If there's more of a chance of debris getting into the pump, you might consider one of our SEWAGE PUMPS as they can handle some of the small solids like leaves and small twigs. Please note that for any outdoor application, all electrical connections would need to be very well protected from the elements.
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I want to replace my old 1/3 hp Zoeller with a newer 1/2 M98. Our pump has worked well but we got hit with a lot of water in the Sept 2011 flood (Lancaster PA area). The check valve double checked so I don't know if the pump would have handled that volume. The pump is old, has a 1 & 1/4 line out. Do you think replacement with a 1/2 hp upgrade would be ok? Fits in the well the same but would handle a bit more water per hour. Thanks
Bob Spender 
from Pennsylvania 
October 23, 2012
Answer
Due to the fact that you have a 1-1/4" discharge pipe, you may not see a big difference in your GPH capacity, though you will see some. If there's any chance of upgrading to a 1-1/2" discharge pipe, you would see a bigger difference. Also, depending on the age of the check valve, you might consider replacing that as well. They tend to wear out just like an old pair of shoes.
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I would like to know how many watts a 1/3 or 1/2 hp sump pump has, because i was think of buying a portable generator in case the power goes off.
Tom B. 
from New York 
September 03, 2012
Answer
That really depends on the pump. Some are more efficient than others. For example, the 1/3HP Basement Watchdog model BW1033 has a running amp rating of 3.5 and a starting amp rating of 7. When you figure the watts by the formula of amps times volts equals watts ( A X V = W), you get 420 running watts and 840 starting watts. But when you look at the Zoeller 1/3HP model M53, that pump has a running amp rating of 9.6 and a starting amp rating of 29.6 or 1152 running watts and 3552 starting watts.
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Jim, I've learned a lot reading these Q&As and the reveiws. A few questions for you - hopefully this isn't overboard, I'm rather new to having a basement... 1. My current sump pump is old and I'd like to proactively replace it. Based on where I live, and how active he heard my sump pump going off even after no rainfall for a while, a plumber/family friend recommended getting 2 high velocity pumps at least 1/3 HP (with 2" discharge). Even though this only has 1.5" discharge, based on reviews I'm sold on either this Zoeller or your Storm Pro 'Best'. I've also heard of some friends having someone out to 'install a battery backup' on their existing pump (apparently not a separate system including another pump). Is there a way to add a battery backup system on to these pumps, since I want those pumps but the security of a battery backup? Does this approach of 2 of the same pumps make sense to you, or should I be looking to get one of these and a battery backup system? 2. How much time do the battery backups generally give you? Thanks! 3.
Tony 
from New Jersey 
August 28, 2012
Answer
Thank you for visiting Sump Pumps Direct. In answer to your questions, both the Zoeller and StormPro pumps are extremely reliable and well manufactured. The StormPro is more efficient however and will offer a higher pumping capacity. If you decide to go with, say the 1/2HP model BA-50M, there would be no problem reducing the 2" discharge down to a 1 1/2". A 2-pump system is fairly common when you want to have the ability of having a "secondary primary" pump in the event that the "primary" pump gets overwhelmed and is the best way to achieve excellent results. Just be sure to run a separate discharge all the way out for each pump. You DO NOT want to install one extra large pump like a 3/4HP or 1HP because during normal operating times, the high HP pump will cycle way too often and reduce the life of that pump. The only battery backup system that we would offer for your primary pump would be the SUMPRO Fully-Automatic 1800W Auxiliary POWER SOURCE which requires 2, 12 volt maintenance-free deep cycle batteries. At the cost of these systems, you might look at a regular BATTERY BACKUP sump pumps system or even a small 7000-8000 watt STANDBY GENERATOR.

The standard battery backup sump systems will typically give you about 7 hours of continuous run time or 24-36 hours of non-continuous (cycling) run time. There are some systems that will accept additional batteries to extend that run time, but it is available only on certain models.
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what pump do you recomend for a 1250 gal septic system
Bill 
from New York 
July 29, 2012
Answer
Unfortunately, I do need more information in order to assist you further. If you can supply the total dynamic head that you are dealing with, I'd be happy to help or you might try calling Hart Traverse at 800-535-8525 for further help on sizing your pump.
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I don't know which model sump pump to purchase or which model is appropriate for my home. How do I go about doing that?
Harry  
from Illinois 
May 20, 2012
Answer
If you are replacing a sump pump and the pump has performed well for you in the past, it's best to replace it with a pump that matches the horsepower and/or gallons per hour rating as close as possible. If that information is unknown and the original pump's brand and model number is still visible on the pump, you can always look it up on the internet or call us for more help. If no information is available, an average sized home in a typical water table can usually use a 1/3HP - 1/2HP sump pump. Submersible sump pumps are more popular and will usually run quieter and last longer than pedestal sump pumps. You can also click HERE for more information on how to pick the perfect sump pump.
If you have additional questions, please let me know or give me a call.
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I am torn between which Zoeller pump would be best for my application. My basement is 104' and currently takes in approximately 3" of water when there is a hard rain. The water is only on one side of the basement and never comes up on the other. Would you recommend a 1/3 hp or 1/2?
Joe 
from New Jersey 
January 15, 2012
Answer
Without knowing more specifics like the water table, area of the country you live in, actual square footage of your basement, etc., it really is difficult to answer. I can tell you that most average sized homes in an average water table area can usually get away with a 1/3HP or 1/2HP pump. Beware of over-sizing the pump as it could cause the pump to cycle too frequently thereby reducing the life of the pump. You don't want to just install a 3/4HP or 1HP pump just for the sake of it.
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I am considering buying a Zoeller m98. I am going to have it on a dedicated circuit my question is how many amps does the circuit breaker and circuit need to be. I see that the running amperage is 9.4 but I am concerned about having a circuit that will carry the starting load.
Peter Warren 
from New York 
December 30, 2011
Answer
Generally, the amps required to start (29.2) the pump only happen for an extremely brief period of time, therefore the manufacturers recommend that electrical wiring and protection must be in accordance with National Electrical Code and any other applicable state and local electrical requirements.
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can i adjust the float on a m98 pump? I cant get it any deeper, but need it to kick on sooner...
Zach 
from Washington 
December 29, 2011
Answer
Unfortunately, the Zoeller M Series pump floats are designed with a set on/off level that can not be adjusted.
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Still evaluating: Question on Zoeller M98: Why does Motor Amps read "9.4 / 29.2"? What does the 29.2 mean?
David 
from Michigan 
August 07, 2011
Answer
The 29.2 amp rating is the starting amps needed to start that pump. The 9.4 amp rating is the running amps. These numbers are usually very important when trying to find the correctly sized generator to power the sump pumps.
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do I need to drill a vent hole in the discharge pipe when installing Zoeller M98 in my basement for dewatering?
Ed 
from New Jersey 
June 04, 2011
Answer
You should always drill the vent hole when you are using a check valve. This 1/8" or 3/16" hole will help reduce the chance of air lock in your discharge pipe. Drill the hole in the discharge pipe even with the top of the pump. NOTE: THE HOLE MUST ALSO BE BELOW THE BASIN COVER AND CLEANED PERIODICALLY.
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I have this pump: Zoeller M98 - 1/2 HP Cast Iron Submersible Sump Pump w/ Vertical Float Switch, I am on my 3 pump in 6 years. All the same pump. Each time the pump gets stuck in the on positon and will not shut off. Can I replace the switch? I just got a new one and thought I could fix the swith on the old one and keep for a back up. Also, isn't is strange that this keeps happening? Our pump runs quite a bit in the spring and in winter is we get rain or a big snow melt. I keep getting the same pump from my home builder who runs a plumbing supply company and get a good price. Should I consider a different pump?
Ryan Schmitz 
from Illinois 
April 22, 2011
Answer
The Zoeller pump is an excellent product but, the switches do tend to be the occasional problem. You might try calling Zoeller tech support at (800) 928-7867 for assistance in obtaining the switches. Also, you should be inspecting your pump and basin at a minimum of every 6 months to make sure the pump is operating properly and the basin is clear on any debris. Most switch failures are the result of dirt, grime or debris getting lodged in the switch and/or switching mechanism.
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I want to replace our pedestal pump, which runs a lot due to high water table, and the zoeller M98 looks good. We have a rectangular sump hole in the corner of the basement, about 18 inches deep (est). What accessories would I need with the pump? All the covers I see are round, is there a rectangular cover available, and where does the check value go? Thanks!
Jim Shear 
from New York 
April 03, 2011
Answer
First off, it is recommended that you replace your pump with one that is comparable in HP and GPH(Gallons Per Hour). We only carry the round basin covers that will cover an 18" round basin. The check valve can be installed either at the base of the pump or just above the basin cover. Installing above the basin cover will make it a little easier to disconnect your discharge for any service. Also keep in mind that you should drill a 3/16" hole in your discharge pipe just above the discharge base to help prevent any air lock.
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How can i get the arm that the float rides on the m53?
Steven Ramsey 
from Indiana 
February 12, 2011
Answer
We do not sell replacement parts. You might try contacting Zoeller @ (800) 928-7867
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Can you raise the vertical float switch to accommodate a higher water level in the sump pump pit on this Zoeller submersible sump pump, if so, how?
Daniel 
from Illinois 
February 07, 2011
Answer
These Zoeller submersible sump pumps have a factory set pumping range and are unable to be adjusted to accommodate a higher water level.
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My pump keeps running, is it the switch or the pump?
Dennis Lainson 
from Iowa 
February 05, 2011
Answer
In most cases, if your pump keeps running, it is most likely a switch problem.
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I am considering ordering a back-up for my thirty-year-old Sears Craftsman 1/2 hp submersible. So far this unit (Zeoller M98) looks to be the best fit in terms of size, capacity and quality. Can I reuse the Craftsman solid state controller? The reason why is, I like that I can precisely set the cycle on/off level, using these little probes that run to an A/C line controller. I'd re-buy that exact same Craftsman unit again, except they don't make it anymore.
Steve Manseau 
from Massachusetts 
January 05, 2011
Answer
An external float switch will not work with this pump because the switch on the Zoeller M98 is part of the pump.
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What material is the impeller made of?
Steven Manseau 
from Massachusetts 
January 05, 2011
Answer
Per the Zoeller site, they describe it as a non-clogging, engineered plastic vortex impeller.
+
What is a Vertical Float Switch?
Jon 
from Illinois 
December 29, 2010
Answer
A vertical float switch is a ball that floats above the water. As the water level rises so does the float which, at some point, it will trigger the switch to turn the pump on. This float has limited movement up and down and side to side, giving it less freedom of movement and less of a chance to get stuck as a tethered float would.
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