Zoeller M53 Sump Pump

Zoeller Most Highly Rated Consumer Sump Pump

Learn Why Zoeller M53 Mighty Mate Is So Desireable and Plumber Recommended


Zoeller M53 Most Highly Rated Sump Pump with Consumer and Plumber.

Why is the Zoeller M53 most highly rated?

A review of the Zoeller M53 Mighty Mate reveals it has all of the key product features and specifications so important for a quality, durable and high performing primary submersible sump pump.

Product Features Summary M53 Mighty Mate Submersible Sump Pump

Zoeller M53 Sump Pump Specifications are built with quality.
  • Zoeller is the oldest sump pump manufacturer in the USA. It had its humble beginnings in 1939 as a family owned operation making various products, one of which was the pedestal (also known as a column) sump pump.
  • Zoeller pumps are manufactured and assembled in the USA.
  • All Zoeller pumps are tested before leaving the shop.
  • High quality epoxy coated cast iron is used for the motor and pump housing and switch case.
  • Shaft seal is carbon and ceramic.
  • The upper and lower bearings are sleeve bearings.
  • Motor is permanently oil-filled, hermetically-sealed with built-in automatic reset thermal overload.
  • Screws, switch arm, guard and handle are stainless steel.
  • The ring between the motor and pump housing is a watertight, neoprene square.
  • The impeller made of engineered, glass filled plastic is reinforced with a metal insert.

The M53 Might Mate is durable.

  • The 2-pole vertical float is a solid, buoyant, polypropylene. Punctures will not affect it.
  • Nothing will rust. The cast iron housing is epoxy coated. Sheet metal is not used since it rusts.
  • All bearings are permanently sealed and oiled.
  • Watertight, neoprene square ring prevents housing leaks.
  • The four pole motor reduces the amount of revolutions required. Most motors are two pole and must revolve twice as fast to achieve the same results.

The Zoeller M53 is high-performing for a 1/3 horsepower sump pump.

  • The 3/10 hp pumping capability is comparable to most competitors 1/2 horse power pumps because Zoeller motors are very efficient. They are not canned motors with a housing slide into another pump housing. Zoeller motors are built directly in the pump housing. This aids in dissipating heat and thus reduces overheating.
  • The impeller is a vortex style allowing solids up to 1/2 inch (13 mm) to pass through thus eliminating the pumping slow down because of screen clogging.
  • The float movement is very slight since it is two-poled. This eliminates the need for the float to move up and down several inches. Since the movement is slight, it takes less time, reduces float sticking and getting caught.


Zoeller M53 is most highly rated customer submersible sump pump.
High ratings are confirmed by consumer reviews submitted by those who own the Zoeller M53 Mighty Mate.
Zoeller M53 Mighty Mate Submersible Sump Pump receives high customer ratings.

 Manufacturers Product Description

Zoeller Pump Manufacturer provides the following Product Description. The M53 is:
  • Float-operated, submersible, 2-pole mechanical switch and variable level, long-cycle systems available
  • Solid, buoyant, polypropylene float
  • On point: 7¼” (18 cm)
  • Off point: 3” (8 cm)
  • Cast iron switch case, motor and pump housing
  • Engineered thermoplastic base
  • Corrosion-resistant with powder-coated epoxy finish
  • Engineered, glass-filled, plastic impeller with metal insert
  • Sheet metal parts to rust or corrode
  • Stainless steel screws, switch arm, guard and handle
  • No screens to clog
  • Passes ½” (13 mm) spherical solids
  • Watertight, neoprene square ring between motor and pump housing
  • Oil-filled, hermetically-sealed, automatic reset thermal overload protected motor
  • Upper and lower sleeve bearings running in bath of oil
  • Carbon and ceramic shaft seal
  • Entire unit pressure-tested after assembly
  • Watertight and dust-tight
  • Permanently oiled bearings
  • Maximum temperature for effluent or dewatering: 130° F (54° C)
  • 1½” NPT discharge
  • Major width: 10-3/32" (26.2 cm)
  • Major height: 10-1/16" (25.6 cm)

 What Do The M53 Mighty Mate Product Specification Details Reveal?

The pump housing is cast iron which is extremely durable and is not affected by continuous, heavy duty pumping.
The vertical sump pump float switch, protected by a guard which keeps it from getting caught on the pit wall, design is superior in that its vertical movement is slight before the switch activates. eliminating the problem of float movement and lack of circuit connection.
This 1/3 HP pump, because of motor efficiency, can pump as much water as a 1/2 HP made by other manufacturers. It pumps 2580 GPH at 5 foot lift and 2040 GPH at 10 feet.

Manufacturers Product Specification

Zoeller Pump Manufacturer provides the following Product Specifications.
  • HorsePower: 0.33 HP
  • Voltage: 115 V
  • Phase: 1 Ph
  • Hertz: 60 Hz
  • RPM: 1550 RPM
  • AMPS: 9.7
  • Impeller Tyoe: Non-clogging vortex
  • Solids Handling: 1/2" spherical solid
  • Cord Length: 9'
  • Max. Head: 19'
  • Max.Flow Rate: 43 GPM

Manufacturers Reported Pumping Performance Flow Rate

Zoeller Pump Manufacturer provides the following Puming Performance FLow Rate Specifications.
  • Five Feet (1.5 Meters) Lift - 43 GPM 163 Liters GPM - 2580 GPH 9780 Liters
  • Ten Feet (3 Meters) Lift - 34 GPM 129 Liters GPM - 2040 GPH 7740 Liters
  • Fifteen Feet (4.6 Meters) Lift - 19 GPM 72 Liters GPM - 1140 GPH 4320 Liters

Benefits Of Owning A Zoeller M53 Mighty Mate

M53 has quality features and is a work horse for homeowners with an average amount of water during a heavy rainstorm.
This sump pump is built to last for average water conditions. This pump is cast iron - pump housing. The volute is engineered plastic and the impeller is glass-filled with a metal insert to provide additional strength.
This sump pump will not clog. It has a vortex impeller design which prevents clogging. It is also build to pass 1/2 inch spherical solids. Many competitive brands do not provide this feature. It has no screen to clog.
The vertical float switch assembly is encased in cast iron. The float is buoyant and made of polypropylene, solid and made to last. Like any other sump pump the switch will not last forever and needs to be changed every 2-3 years depending upon amount of usage. The design of the float switch decreases its tendency to get hung up.
The 1/3 HP efficient motor is powerful. It can pump 43 gallons per minute (or 2,580 GPH) at 5 foot lift and 34 gallons per minute at 10 foot lift (or 2,040 GPH). It has a greater pumping capacity than competitor 1/2 HP brands. Maximum head it will operate at is 19.25 feet.
The motor is 60 Hz, 1725 RPM, oil-filled, hermetically sealed, has automatic reset  thermal overload protection. Voltage is 115V. Amps rating 9.7. The sleeve bearings run in a bath of oil. It has a carbon and ceramic shaft seal. It can handle a maximum temperature of 130 degrees F.
The screws, bolts, pump handle, guard, arm, and seal assembly are stainless steel. The cord is 9 foot, UL Listed 1-wire neoprene cord and plug.
The size of the pump is a smaller footprint with height of 10 1/16 inches and maximum diameter of 10 3/32 inches. It will easily fit into an 18 inch diameter pit along with a backup sump pump.
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How Does The M53 Mighty Mate Price Compare?

As for the cost, the price is very competitive with other name brand pumps of same pumping capacity. In fact Zoeller is a better deal since it has more quality features. A glass filled metal insert in the impeller, the non clog vortex impeller, solid vertical float system are some of the examples of additional quality.
The cost of the pump ranges from $130 to $169. This is a good deal. Here is a Quick Shop link to the $133 Mighty Mate M53.

What Can We Learn From Consumer Product Ratings?

  • Consumers give the M53 Mighty Mate a well above average rating (4.6 stars in a 5 Star Rating Scale) as a submersible sump pump selection. Of the over four hundred online consumern reviews, 86% of consumers rated it 4 stars and above with 76% giving it 5-stars.
  • 14% rated it 3 stars or lower. The most common reason for a lower rating was because of float switch failure. The switch and ggasket last somewhere between three and eight years depending upon usage and pit conditions. The float is puncture proof and therefore cannot fail because of filling with water. The switch will fail after so many uses. It is best to change the switch between three and five years. The switch costs around $30 and is easy to replace.
  • The pump is not light - twenty-one pounds. The weight prevents the pump from moving around during operation. It may take some effort to remove it from the pit when replacing the switch.
  • The solids handling design is good. There is no bottom or top screen to remove. The impeller is made to handle up to 1/2 inch solids. If you have a pit frequently filled with debris, it is recommended you remove the base of the pump periodically to check on the impellers free movement; otherwise cleaning should not be necessary. When checking the impeller also check the two small holes by the impeller and the discharge port to make sure they are not clogged. Clogged holes could cause an airlock which means the impeller would move freely but the air pocket would prevent the pushing of the water.

Read Some Consumer Reviews For The Zoeller M53 Mighty Mate

Here's what some consumers are saying about the Zoeller M53.
High Quality Pump, March 9, 2015
By Dustin J. Koberle - Finally had to replace my Zoeller M53-D pump after 12 years of service, actually I didn't really replace it I just bought another one, I will put a new switch in the old and keep as a spare. We have a very high water table here and the pump runs every 2-3 minutes most of the year. You won't find a much better pump out there that can run like this for 12 years and only need a $20 switch. Oil filled for long life, quiet and reliable. I'll never run anything other than Zoeller.
Excellent Product Buy With Valve, March 2, 2015
By Keith - I recommend buying the Zoeller M53 Mighty-mate Submersible Sump Pump, 1/3 Hp with check valve if you are replacing your sump pump.
The valve keeps the water from backing up adding needed extra life and proper working order to the sump pump itself. I have had it now for 2 months, installed it myself and it was very easy to do (if you know what you are doing) and works problem free. I love the solid construction. Good buy for the money!
This is the sump pump standard, May 30, 2014
By JDB Contracting "jim" (Michigan) - If you need a sump then the Zoeller M53 Mighty-mate submersible is is what you want. I work in new construction and this pump goes in 99 out of 100 houses. I have never had a problem with it.
It pumps water from the sump with ease, March 25, 2014
By Scott T (Bellevue, WA) - I did a lot of research before I bought the Zoeller M53. This had the best reviews of all the pumps I looked at. So far it has been pumping the water from my underground sump with no problem. It pumps the water both quickly and quitely and is built solid.
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18 YEARS AND STILL GOING STRONG!!!, February 2, 2014
By Kevin Patteri - Well tonight I thought it was finally time to replace my sump pump (Zoeller M53)after 18 years! The float was sticking in the up position and it wasn't shutting off. Well after some messing with it the issue was a piece of debris stuck under the float so I moved it and now it's working fine. Don't go out and buy something from China from a local store, go with a Zoeller! Maybe it is time to replace it after 18 years but since it's working fine I think I'll just let it keep going! Really a quality product!
Great durable heavy duty pump, March 7, 2013
By Pete (Fairfield, CT) - I just installed the M53 today and it is working great, no surprise. My review is really on my great previous experience with the M57, and I hope to get the same out of this one. The M57 is identical to the M53 in specifications.

The new M53 is running like a champ already right now, and I'm hoping to get another 15 yrs out of this one!

What Does A Plumber Say About The M53 Mighty Mate Submersible Sump Pump?

Here is the testimony of Barry Schilling who is a plumber for USA Seepage. He certainly believes in the reliability of the Zoeller M53.

Installing The Zoeller M53 Is Easy. Here Are The Ten Simple Steps.

  • Unplag the old pump. Remove it from the sump pit.
  • Clean the bottom of the pit removing sludge and debris.
  • Remove the new M53 from the carton.
  • Place a fitting coupler into the pumps 1 1/2 inch discharge port.
  • Sit the pump in the pit so it rests solidly on the pit floor.
  • Determine length vertical PVC disharge pipe needs to be. Mark where it should be cut and remove excess length or if necessary add a new length of PVC to make the discharge pipe long enough.
  • Seat the PVC discharge piping into the check valve union. It is always best to install a new check valve.
  • Plug in the M53 to test for operation and potential leaks.
  • Fix leaks.
  • You are done. Expect the Zoeller M53 to provide you with many years of service.
We are also providing a video made by Chris from Atlantic Drain. Watching the installation of the M53 submersible sump pump will give you the extra support you may need so you have the confidence to install it yourself. Installing the M53 really is easy.

Recommended Maintenance For The Zoeller M53 Sump Pump

  1. The M53 Switch needs to be replaced every 3 - 5 years depending upon how often the pump runs. It is very easy to replace the switch, Part Number 004892Zoeller M53 Replacement Switch 004892. Also fits M55, M57, M59 and M98 Series pumps ,using a screw driver.
  2. The rubber boot/seal where the float lever enters the pump cap assembly will harden over time. Keeping this lubricated with a bit of silicone grease will help prevent or solve this problem. Do not use a petroleum based grease. If the rubber/boot seal does fail the cap assembly will need to be replaced for around $30 - part #004703.
  3. The impeller should be checker periodically. Just remove the base of the pump (they are several screws to remove) and to scrape/clear out any built up debris or buildup, clear the area by the exit pipe and make sure the check valve operates properly.
  4. Flow Holes need to checked for clogging. There are two small holes in the pump assembly by the impeller and exit pipe. These can get clogged over time and can cause an unlikely 'airlock' situation where the impeller will turn freely within a pocket of air and not push any fluids. Keeping these holes clear with a nail will prevent this condition.
  5. Performing periodic maintenace for Zoeller sump pumps is not unique to Zoeller. All sump pumps require periodic maintenance. In fact, sump pumps with bottom screens or top suction may required more maintenance. Keeping the screen clean can be challenging.

FAQ Frequently Asked Questions About Zoeller M53

Can I use this pump outdoors?
-->Yes. This pumps electrical mechanisms are waterproof. Make sure the electrical outlet is waterproofed and that the outdoor pump installation meets city rules.
Must I drill a hole in the discharge pipe for the pump?
-->Yes. It is recommended a 1/8 inch hole be drilled at a fourty-five degree angle below the pit cover and check valve. Drilling the hole at the height of the top of the pump will work fine. The hole prevents air lock.
Will the M53 pumping performance meet my needs?
-->Know how much water needs to be pumped from the pit during a heavy rainstorm. Here's is how to determine if this pump will work for you. Measure the diameter of the sump pit at the top. Take a yardstick and put it in the pit during a heavy rainstorm. See how many inches the water rises during sixty seconds. If too much flows in, measure at 30 seconds and multiply the inches by two. For example, let's say 8 inches of water flow into your pit during the thirty second time period. Eight multipled by 2 is sixteen. For an eighteen inch diameter pit, one inch equals one gallon. For a twenty-fouth inch diameter pit, one inch equals two gallons. So sixteen inches equals sixteen gallons a minute. Measure the vertical height of your discharge piping. Generally it will be somewhere around ten feet. At a ten foot vertical height, the M53 Mighty Mate is capabile of pumping 34 (thirty-four) gallons per minute so the pump will easily handle the water flow into your pit during heavy rainstorms.

Available Zoeller M53 Sump Pump Parts

Available parts for the M53 submersible sump pump includes the float switch (part-no: 004892). This is good because the motor is built to outlast the float switch. In fact a float switch should be replaced every two to five years depending upon how often the sump pump runs.
Replacing the Zoeller M53 float switch is a perfect solution to a failed sump pump switch. It makes sense to replace the switch rather than throw the pump away because of the following reasons.
  1. The replacement part 004892 fits perfectly. It is manufactured by Zoeller.
  2. The switch is very easy to replace. The instrutions are easy to follow.
  3. Zoeller Technical support is available to answer questions.
  4. A replacement switch is much cheaper than buying a new pump.
  5. Here's the link: Zoeller M53 Replacement Switch 004892. This switch also fits M55, M57, M59 and M98 Series PumpsZoeller M53 Replacement Switch 004892. Also fits M55, M57, M59 and M98 Series pumps
A gasket cas/cover (Part Number 004046) is also available. Zoeller Gasket Case / Cover Part Number 004046Zoeller Gasket Case / Cover Part Number 004046

Zoeller M53 vs. Other Zoeller Sump Pump Models

Zoeller M53 is the automatic basic model of the M50 series. The difference between the M50 Series is the construction material used. All M50 series models have a two-pole mechancial vertical float with one and one-half inch discharge port with 2040 GPH performance at ten foot height witjh shut off height of nineteen and one-fourth feet.
M53 vs M55 reveals M53 with cast iron housing whereas M55 has bronze housing. Both M53 and M55 have a thermoplastic base (volute), and glass filled with metal insert impeller. Bronze is superior to cast iron for durability; however, bronze costs six times more than cast iron.
M53 vs M57 reveals both models have cast iron housing; however M57 has a cast iron base (volute) and impeller for greater durability.
M53 vs M59 reveals M59 has bronze housing, bronze base, bronze impeller. M59 is more durable and made for much more heavy continuous usage. Compared to M53 it costs nine times as much.
The non-automatic models of the 50 series use the same consturction material as their automatic models. The only difference is the non-automatic comes without a float and switch.
Models M55 and M98 are constructetd the same. The only difference is the pumping performance. M98 pumps 3660 GPH at a ten foot height and has a shut off height twenty three feet.

Purchase Link For M53 Mighty Mate Sump Pump

Compare Zoeller M53 with other Zoeller Submersible Sump Pump model specifications. Zoeller also manufacturers Battery Backup Sump Pumps.
Go back to Zoeller M53 Sump Pump index.
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