Best Sump Pumps : Battery Backup Combination, Float Switch & Batteries

Sump pumps, nowadays has become must-have for homes as they can save your home from getting damaged due to flood.

If you have installed a good quality sump pump in your basement, you can stay relax even in during a heavy storm.

But there's one thing need to remember! Even your best sump pump can stop working due to many reasons like- power outage or natural disasters or battery failure. In a situation like this, your basement can become a total mess.

You may be thinking- how can I save my home from this disaster?

Well, battery backup combination will work great in these kinds of messy situation.

If you have a perfect backup sump pump, you don’t have to be worried about all these. The backup sump pump will be activated automatically and continue the process.

And if you combine the whole system with a right float switch and battery, you can involve yourself in more productive activities rather than getting stressed thinking of flooded basement.

Table of Contents

The Best Battery Backup Sump Pump Comparison - 2018






Wayne WSS30V

Best Combination Sump Pump System

44.5 pounds

Zoeller 508-0006

With Battery Back-Up

17 pounds

Liberty Pumps SJ10

Best Hydro Powered / Low Cost

5 pounds

Superior Pump 92900

Battery Back Up & Tethered Switch

15 pounds

Wayne ESP25

Audible alarm, notifying back up

22.7 pounds

Little Giant 6-CIA

Editors Choice

17.65 pounds

Zoeller 98-0001


39 pounds

Flotec FPPM3600D-01

Suitable for small basin

12.38 pounds


Best Primary

12 pounds

Superior Pump 92341/3

Replaceable power cord

16 pounds

Float Switch

LevelGuard Z24801A1Z

Resistant to corrosion

2.5 pounds

Flotech-Parts 2O


1 pounds

Superior Pump 92010

Suitable for any pump

1.35 pounds

Basement Watchdog BWC1

Editor’s Choice

1.3 pounds

Hi-Lo Pump Controller

Versatile use

14.4 ounces


MK Deep Cycle

Editor’s Choice

63 pounds

PumpSpy AGM Battery

Maintenance free

49 pounds

Top 10 Sump Pumps (With Battery Backup) Reviews

Combination Sump Pump System

1. WAYNE- Primary and Battery Backup Combination Sump Pump System

Wayne i launched this WSS30V pump considering the graveness of its necessity. It is a combination of two pumps. Both of the pumps are ½ hp. The primary pump is 120 volts and secondary pump is 12 volts. 

The WSS30V pump is pre assembled. So, there is nothing much for assembly, you just need to place it in the system and kick start.

The condition monitors that comes with the battery case is the most convenient feature of this pump. There are three lights for indication of the state of charge. So, you can always be prepared for emergencies.

Besides, when the secondary pump starts it notifies you with a beep. The attached alarm is for notifying water level. It runs for 20 second and sets off automatically.

This pump can be installed in any basin with a diameter of larger than 15 inches.  It has impressive 4200 GPH capacity whereas the secondary one has maximum 2900 GPH capacity.

It is a pro quality system and reasonably priced. Installing this pump may give you peace of mind for years.

Things We Liked

  • Pre assembled;
  • Less risk of clogging;
  • Quiet.

Things We Didn’t Like

  • No cons.  

2. Zoeller Preassembled Sump Pump System with Battery Back-Up

This is a combination system (model no 508-0006) from Zoeller. The primary pump is model 503 and runs on 115 volts. Whereas the battery backup pump is model 508 pump and it requires a 12 volts battery to operate.  

In this package, you get a charger cum controller with several layer of notification facilities as accessories.  

A basin larger than 16 inches diameter is needed to set this combined system. This heavy duty pump comes with high tech control box. It includes a compact charger for 10 amp battery and over charge protection unit to ensure longevity of the battery. There is a LCD screen attached to display necessary information …..

Both AC and DC discharge check valve and adapter is included; so, you have flexibility to use any. It has its built in notification and warning system. Yet, it has options to connect to your home security for extra caution.

The only drawback is, if one of those pump fails, you have to remove both of the pumps for repair or testing; leaving your basin unprotected.  But the major advantage is, unlike other combined pumps, the backup pump in this package can be operated simultaneously. So that, in times of severe flow, you can operate both for extra discharge.

Things We Liked

  • Good packaging;
  • Reasonably priced;
  • accessories included;
  • Durable and long lasting.

Things We Didn’t Like

  • Float switch may not be long lasting.

Backup Pump

3. Liberty Pumps-Jet Water Powered Backup Pump-Best Hydro Powered/Low Cost

This pump from Liberty Pumps runs on hydro power from the municipal water supply. This backup pump suits best in disaster prone areas; where power cuts off for days and batteries of the backup pump cannot be charged. 

When the primary pump fails, this backup pump turns on by itself. Using the force of your water supply, this machine pumps out 2 gallons of water per 1 gallon of supply water.

The instruction manual included with the packaging is straightforward; anyone can install the pump following the instructions in it. Besides, it is easy to install.

You must have a water supply inlet of more than 20 psi and a ¾ NPT inlet to install it. This pump will not work in freezing weather. If the water inside the discharge freezes, it becomes useless. Make sure to have a heated basement.

Considering the price, this pump works wonder in times of emergencies. Instead of battery or electric bill, you will be paying a little extra water bill for operating this pump.

Things We Liked

  • Easy installation;
  • No electricity or battery required;
  • Low cost;
  • Automatic.

Things We Didn’t Like

  • Needs uninterrupted water supply to operate;
  • Not suitable for freezing environment.

4. Superior Pump-Battery Backup Sump Pump

No matter how efficient your primary sump pump is, you always need an even better backup pump to rely on in emergencies. Superior Pump brought this thermoplastic backup pump (model no 92900) which is proven to be highly effective. 

This 12 volts DC machine (model no 92900) runs on battery to fire up the pump. An AC charger of 2 amps, battery box and tethered float switch is included in the packaging. A deep cycle battery is required to operate the pump, but must be purchased separately.

Unlike most of the pumps in the market, this back up pump operates independently. It is a great advantage as you can run both pumps during heavy downpour. The included alarm notifies power cut off.

The only problem is, the alarm keeps ringing even after the power is back. You have to mute the alarm off manually every time it rings. This feature makes this pump unsuitable to leave at home when you are away for days.  

Things We Liked

  • Good quality;
  • Works independently;
  • Alarm, power cord and charger included. 

Things We Didn’t Like

  • Alarm needs to be shut off manually.

5. WAYNE -12 Volt Battery Backup Sump Pump System

The features that makes this pump (model no ESP25) stand out compared to other back up pump is, it can fit in small pits. Its reed float switch needs little room to function. This pump is has a corrosion resistant thermoplastic body. its maximum lift is 10 ft and maximum flow is 3300 GPH. 

It has alarm to notify the starting up of the pump. The sound is very low to notice at all. The LED lights are handy to indicate the battery status and running of the pump.

Though using WAYNE WSB1275, 75 AMP battery is recommended in the manual. But You can choose between any 40 amp or 70 amp marine battery to run this system. There won't be any difference in performance.  

The manufacturer recommends using the provided charger. But it does not have any function to prevent overcharging. Using a battery minder will save your battery from drying off. This is an highly efficient pump and is a life saver for small pits.

Things We Liked

  • Fits in small pit;
  • Good warranty option;
  • Easy installation.

Things We Didn’t Like

  • Low alarm;
  • The charger over charges the battery. 

Primary Sump Pump

6. Little Giant -1/3 Hp Submersible Sump Pump- Editors Choice- Best Affordable

If you don’t prefer changing primary sump pumps in every five to ten years, then this is the pump (model no 6-CIA) for you. People claim using this pump (model no 506158) from Little Giant for more than 20 years without any trouble. Its robust cast iron construction makes it last for decades. 

It is a 1/3 HP and 115V pump with maximum flow of 2760 GPH. it needs only 7-Inch head to start and shuts off at 1-¾ inches. It is suitable for continuous duty due to its overload protection functionality. This pump is suitable for residential, commercial and industrial usage for its impressive longevity.

You need a pit at least 18 inches in diameter to install this pump. It is economic and heavy duty. You will have enough budget to invest in a backup pump even after purchasing this. This pump is enough to deal with the tough jobs of your basement pit.

Things We Liked

  • Economic;
  • Continuous duty;
  • Durable construction;
  • Long lasting.

Things We Didn’t Like

  • No cons.

7. Zoeller Flow-Mate Submersible Sump / Effluent Pump

Zoeller is a trusted name as a pump manufacturer. Their effluent pump (Model M98) falls within affordable range with same durability like other widely used zoeller pumps. The ½ hp motor is protected within cast iron housing; but the joining parts are made of stainless steel for longevity. 

The impeller is made of plastic only and this pump has no screen, giving it a non clogging feature. Its maximum flow is 3420 GPH at 5 feet lift. Its maximum lift is 20 feet. It comes with a 15 inches power cord. So, if you need a pump with extra long cord, then M98 from Zoeller is the pick for you. It has automatic reset thermal overload protection for non stop operation.

This pump is highly resistant to corrosive substances and temperature up to 130 degree Fahrenheit. The float switch is identical 2 pole mechanical switch. Its 1-½ inches NPT discharge can pass solids up to ½ inches.

Among all the impressive features, only one drawback of this pump is its high tech float switch. Users complain about failing of the float after one or two years. This can be solved by attaching a good quality piggyback switch. Then your pump will be as good as before.

Things We Liked

  • Noise free;
  • Affordable;
  • Non clogging;
  • Highly resistant to corrosion;
  • Heavy duty.

Things We Didn’t Like

Float switch may not be long lasting.

8. Flotec-1/3 HP Pedestal Sump Pump

If your previous pedestal pump gave out and you need a quick replacement within economic range, then this ⅓ hp pedestal pump (model no FPPM3600D-01/09) from Flotec can fulfill your requirements. It is made of thermoplastic base and cast iron housing. To operate the float, a basin larger than 12 inches diameter is needed. 

This pump is extremely easy to install, replace and maintain. It has 1-¼’’ discharge  and highest lift is 8 to 10 feet. Its power cord is only 6 feet long.

This pump has been in use for decades. It is also highly recommended by the users. The newest baches may not be as durable as the previous ones. Because, the packaging claims the pump is ⅓ hp but on the pump it is noted as ¼ hp.

Another annoying matter of this pump is, it vibrates. In turn this vibration may cause less lifespan of the fittings. Its operation is quiet, which is a plus for this pump.

Despite of these facts, this pump is still considered helpful as a backup and suits for light to medium use, not for continuous use.

Things We Liked

  • Economic;
  • Quiet;  
  • Suitable for small basin;
  • Adjustable float switch.

Things We Didn’t Like

  • Vibrates. 
  • Not suitable for heavy duty usage. 

9. WAYNE 3/4 HP Cast Iron and Stainless Steel Sump Pump - Best Primary Submersible sump pump

Wayne offers five years warranty for this pump (model no CDU980E), where other sump pumps fails within five to six years.  Its Glass Reinforced Polycarbonate Impeller is most distinct feature compared to plastic impeller of other pumps. This makes the impeller resistant to clogging and abrasion. 

This ¾ hp pump has a cast iron base under a stainless steel motor housing. Its maximum flow is 4600 GPH; at 10 feet, the flow is 3500 GPH. a sump pit larger than 11 inches is suitable to install this pump. Installation does not need any major plumbing changes.

The pump comes with an 8 foot power cord and vertical float switch. To minimize hang up, float guard is used to the switch. Motor is thermally protected; hence, it prevents overheating when running continuously.

After analyzing all the features and reviews from actual owners, this pump seemed reasonably priced. Setting up this pump in your basement pit will be an investment.

Things We Liked

  • Longest Warranty;
  • Quiet;
  • Durable and long lasting;
  • Good quality float switch.

Things We Didn’t Like

  • No cons.

10. Superior Pump -1/3 HP Cast Iron Sump Pump

All the parts of this pump (model no 9234) is made and assembled in Superior Pump factory to ensure quality at its best. Nowadays most of the pumps are only assembled in a factory but the parts come from different parts of the world; so, the quality remains questionable. 

This is a ⅓ hp pump with maximum lift of 25 feet and maximum flow of 2760 GPH. 4.1 amp ensures energy efficiency and cast iron construction ensures durability. Its impeller is stainless steel made. The pump comes with a replaceable 10 feet cord so that you can always replace it with a longer one if needed.

What make this pump different from others is the side inlet to receive more water flow. Besides, the screen on the inlet is detachable for ease of cleaning. Solids of ⅜ inch can easily pass that screen.

Its removable vertical type float switch is really handy; as you can pick up the pump and detach the switch to use the pump for different purpose. This amazing pump is available in reasonable price and is protected under 3 years warranty.

Sump Pump Float Switch

11. LevelGuard-Solid State Sump Pump Switch

The float switches we get with water pumps mostly fails within a year, no matter how good the pump is. The pump becomes useless once the switch gives up. The manufacturer Level Guard claims this switch (model no Z24801A1Z) to lasts seven times longer compared to other switches. But it is meant for sump pits, not for sewage pump usage.

It comes with a piggy back plug with 15 feet cord. This switch has less chance to failure as it has an upper limit sensor. This float switch is highly resistant to corrosive elements. Besides, five years warranty is offered for this product., hence, you will have stress free five years when this switch is working in your sump pit.

This switch never ‘floats’ unlike other switches; it rather stays submerged like the pump. So, it needs little room to operate, suitable for small pits. Besides, it does not have any moving parts, so, it will not get stuck to the side of the pit to give false signal. Its efficiency is proven after testing for more than 3,000,000 cycles.

Things We Liked

  • Less chance of failure;
  • Resistant to corrosion;
  • Durable construction;
  • Less chance to get stuck;
  • Long warranty.

Things We Didn’t Like

  • Pricey.

12. Flotech-Parts 2O Sump Pump Float Switch

This switch (model no FP18-15BD-P2) is the best economic alternative for your failed switch in times of emergencies. It is easy to replace, a 10 feet cord with piggyback makes this task easy. Mounting strap is also included with the packaging. 

This switch is not only for sump pumps; it is also useful for utility pumps. Using this with a manual pump will convert the pump into an automatic one.

You must have a pit bigger than 14’’ to use this switch, unless it will not have enough room to float. The best feature of this switch is, it is highly compatible, suits most of the brands and can replace any tethered or vertical switch.  

The only problem with this switch is, it is prone to get stuck to pit wall, pump or debris. Care should be taken while installing and testing is must after installation.

Things We Liked

  • Economic;
  • Suits most of the brands pumps;
  • Can replace tethered and vertical switch;
  • Can convert manual pumps into automatic ones.

Things We Didn’t Like

  • Can get stuck if not installed properly.

13. Superior Pump-Vertical Float Switch

In this switch, you get the efficiency and longevity of two float switches with the price of one. It works wonderfully for 7 to 8 years in a row.  

In this package, (model no 92010) mounting accessories and 25 feet long power cord is also included. This switch goes with any pump whether it is sewage pump, sump pump or normal utility pump.

It is 120 volts and draws 10 amps. It is suitable for backup pumps as well. This switch is made durable and highly resistant to abrasion. It can resist temperature up to 140 degree Fahrenheit. It is inexpensive, hence, pairing it with a quality pump will be enough to protect your basement from flooding.  

Things We Liked

  • Affordable;
  • Long lasting;
  • Comes with two floats;
  • Suitable for any pump;
  • Mounting accessories included.

Things We Didn’t Like

  • No cons.

14. Basement Watchdog Dual Float Sump Pump Switch - Editor’s Choice

This package comes with two floats in price of one. Making sure the pump kicks start even if one of them fails. The switch is able to detect even slight rise in water level. Floats are well protected in a plastic cage to avoid getting stuck and keep the switches clean from debris. 

Basement Watchdog supplies this device with controller and accessories for installation. You will always have the flexibility to set this float at any level. Piggyback switch makes this float almost universal, suits most of the pumps currently sold in market.

The most useful feature is, it lets your pump to run for extra 10 seconds to make sure your pit becomes completely dry. A dry pit is must if you prefer a longer lasting pump and float.

Things We Liked

  • Detects slight rise in water level;
  • Less prone to getting stuck;
  • Flexible installation;
  • Two floats attached;
  • Inexpensive.

Things We Didn’t Like

  • Not for sewage pumps.

15. Hi-Lo Pump Controller (Dual Float Switch) by Hydro Check

With this dual float switch from Hydro check, you have the freedom to adjust the turn off and on level from ½ inches difference to 20 feet. This switch is useful for any operation other than sewage usage. This type of switches are mostly recommended for tight spaces, as these switches do not need room to float. 

These switches works with sensors. The mechanism is extremely simple but the effectiveness is mind blowing. Your pump will start when both of the sensors are under water and stops when the upper sensor is out of the water. This feature is helpful to adjust water range according to weather, if you are using this for basement sump pit.

These are maintenance free switch and has no risk of interrupted by debris. This system is suitable for all ¾ hp pumps. The only drawback is its price. But the versatile use and flexibility you get from this device cannot be found in any other switches.

Things We Liked

  • Adjustable range;
  • Maintenance free;
  • No risk of stuck by debris;
  • Fits in small pits;
  • Versatile use. 

Things We Didn’t Like

  • Not suitable for sewage pumps. 
  • Expensive. 


16. MK-Deep Cycle Gel Cell 12 Volt Battery - Editor’s Choice

This battery is one of the most reliable and recommended one for marine usage. It is basically used for backup sump pumps but can be used in motor boats and other similar operation as well.

This gel type battery is praised for its longer life, better holding of charge and suitability for heavy duty performance. Its case is perfectly sealed to preserve the internal chemicals and avoid spills. Its maintenance free also, so that you can concentrate on the performance not on the battery itself.

This battery is backed by a 3 years warranty, but you will less likely need that. Because, it has average life span of 8 years, can make it to 10 years if you are lucky.

Things We Liked

  • Long lasting performance;
  • maintenance free;
  • Suitable for heavy duty usage;
  • 3 years warranty.

Things We Didn’t Like

  • Heavy.

17. PumpSpy - Maintenance Free AGM Battery

This battery is suitable for light usage. Many people look for affordable batteries for their backup pump, as they will need it to perform less often. This battery from Pump Spy is economic. It works best with PumpSpy monitoring system. 

Its case is thermally welded to make it leakage proof and easy to transport. The sealing also ensures keeping hydrogen gas intact, hence, it is safe to use.

The mechanism works by absorbent glass vent technology. This technology preserves the charge more efficiently and ensures the battery works for long time without failing.

Things We Liked

  • Inexpensive;
  • Maintenance free;
  • Leakage proof;
  • Efficient for long term usage.

Things We Didn’t Like

  • Needs pump spy monitoring system.

Benefits of Battery Backup Sump Pump:

Battery powered backup sump pump can save you in any emergency situation like- power outage or sudden failure of your primary sump pump.

1. Power Failure:

In any kind of power failure in your area your primary sump pump may stop working and it’ll cause flood in your basement. In these case, a battery backup sump pump can work as an alternate and keep your basement from flooding.

2. Primary Pump Failure:

We all know that any machinery we use can fail at any time, so do our primary sump pump. So if we have a backup plan like battery backup sump pump can be a great support.

3. Helping Hand for Primary Pump:

A battery backup system can be a great helping hand for your primary pump. If your primary pump can’t handle the flow of the water, this can help it by dealing with the torrential downpours.

How to Choose one for You:

Before buying a battery backup sump pump, you need to be aware of some important features and your requirement. Here I’ve listed a few important points you should consider before buying one.

1. Battery:

Usually two types of batteries are used in sump pumps, deep cycle marine batteries and AGM batteries. Deep cycle marine batteries need to maintain regularly but AGM batteries don’t require any maintenance. Moreover, AGM batteries have 5 to 7 years of service life and run 50% longer than a deep cycle battery.

So before purchasing must check, whether the backup system includes deep cycle or AGM battery.

2. Construction:

Sump pumps are made of different types of material, like- plastic, stainless steel and cast iron. For a long-lasting support, you must go for the cast iron sump pump.

3. Warranty:

Though all of these pumps come with manufacturer warranty, checking while buying can assure you the hassle free after sales service in case of any dispute.

4. Automatic Operation:

The sump pump you are going to buy must be easy to operate. It may happen that you won't be at home and the power goes out. If the machine is automated you don’t need to be worried to turn it on.

5. Working Capacity:

Must check the working capacity of the pump you are going to buy. The working capacity of the battery backup must be exact or more than the primary pump.

6. Technology:

You’ll find two types of pumps available in the market, DC and AC/DC pumps. DC pumps only work on the battery. AC/DC pumps can work on both AC and DC power and also able to switch between these whenever required.

Float Switch:

Float switch is a kind of device that can be used to detect the level of liquid in a tank. The best quality sump pump float switch can also use to control a pump, or work as an indicator, or as an alarm.

I think it’ll be easy for you to pick the right float switch if you know about different types of switch available in the market.

So There are four types of float switch you’ll find in the market-

1. Vertical Action Float Switch:

This type of switch floats above the water and rises with the water flow. When it hits a certain level, it triggered.

2. Diaphragm Switch:

This type of switch mostly used by professionals. They are sensitive to water pressure when the pressure increase it turns on and vice versa.

3. Tethered Float:

This type of switch depending on water heights. The problem with this switch is it may be caught by water and end up sinking and sometimes it may fail to activate the pump.

4. Electronic Switch:

This switch is also known as the flood free switch. It submerges in the water and depends on the water pressure to activate the pump.

Replacing A Float Switch:

If your sump pump doesn’t switch on or off properly, you may need to replace the float switch. You can do it by calling an expert plumber or replace it by yourself.

If you are going to replace the switch by yourself you can follow these simple steps-

  • Allow the sump pump to remove all the water to the basin. When it is done, disconnect the pump.
  • Locate the float switch with the help of the manual and now unscrew them.
  • Remove the old one and glue, replace with waterproof glue and let it dry.
  • Place the switch in the sump pump and test.


When you’re going to buy a new battery for your pump, you may become confused seeing lots of varieties in the market. But if you know a little bit about different types of batteries before going to the field, it’d be easier for you to select the best sump pump battery for you. So here I’ve discussed different types of batteries to help you in this case.

1. Wet Cell Batteries:

These batteries are made up with acid covered plates and submerged in the electrolyte. Wet cell batteries need a regular inspection to keep the lead cells from drying out to prevent damage.

Maintenance of these type of batteries is quite dangerous as it contains lead, noxious gas, acid and moreover have the risk of explosion.

2. AGM Batteries:

Absorbed Glass Mat or AGM batteries are perfect for backup sump pump system. They’re safe than others as it covers the lead-acid cells in a glass fiber material which absorbs electrolytes and don’t leak if punctured.

3. Gel Batteries:

These batteries are quite similar to wet cell batteries but they are filled with gelled electrolyte by using silica gel. Like AGM batteries, they're also maintenance free because the gell will not evaporate.

4. Deep Cycle Batteries:

Deep cycle batteries are lead-acid batteries, designed to deeply discharged using most of its capacity. They’re not able to deliver higher current like a wet cell battery.


So after going through this guideline you may have known about every important detail about a backup sump pump system. Your basement will be safe and clean if you get the combination of great backup system, float switch and battery.

I also have listed the top products of the market of the days. So it’ll be very easy for you to choose the right one for your basement considering the features.

Just remember that the backup sump pump you’re going to buy has the same or more capacity of your primary one. For float switch and battery, you must consider safety and maintenance or operating system.

And that's it! You don’t have to be worried about your basement for a long time.

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