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Quick Information About Sump Pump Gallons Per Minute By Comparison 58 - 84 GPM
- 58 to 84 GPM is the amount of water sump pumps can pump continuously every minute at the vertical height indicated in the pump performance chart.
- Sump Pump Gallons Pumped Per Minute is something the manufacturer tests and publishes in a pump performance curve and chart so home owners and plumbers can determine which pump will meet the home owners water pumping needs.
- Horse power is not an accurate way to find a pump that is capable of pumping 58 - 84 GPM because some one-half HP pumps can pumps as much as other three-fourths HP models.
- 58 to 84 GPM is a lot of water being pumped so it is important to know how much GPM you really need. Here's a way to measure the GPM needed for your particular situation.
- Gallons pumped per minute is affected by the vertical height water is pumped from the bottom of the basin.
- The number of check valves and elbows found in the discharge pipe system affect the flow slightly because of friction caused - somewhere around one to three gallons per minute.
The Best Sump Pumps With 58 - 84 GPM At 10 Foot Vertical Height
We compared pumping performance at 10 feet vertical-height as provided by the manufacturer.
Here are the sump pumps with a GPM between 58 and 84 by brand.
- Zoeller: M95, M98 and N98 - 61 GPM; M95 - 66 GPM, M137 and N139 - 75 GPM
The video created by US Waterproofing explains how homeowners can be misled when looking at the box label which identifies the gallons pumped per minute by a specific branded sump-pump.
Gallon per minute (GPM) pumped for submersible pumps is important because
- Higher horse power (HP) does not necessarily mean a higher GPM pumping capacity than another pump with lower horse power.
- For example, Zoeller and Little Giant do not make a submersible sump pump larger than 1/2 HP; however, the Zoeller M137 and M139 can pump more GPM at 10 ft lift than a Simer, Flotec or Wayne 3/4 HP pump.
- The actual GPM for your sump pump system may be lower than the published performance curve from the manufacturer because your system has more than a check valve and one 90 degree PVC elbow fitting. Fittings and check valves create additional friction and lower the GPM by a gallon per minute.
- The pumping performance you think is needed may not be what is really needed. During a heavy rainstorm, check the flow rate and calculate what GPM is really needed.
- Buying a bigger pump with more GPM is not always the best solution.
- Too much GPM capability is as bad as too little GPM. Too much short cycles the motor and wears it out faster. Too little GPM leads to basin overflow and flooding.
Regardless of what GPM your sump pump system requires we hope you will find PumpsSelection.com very helpful. Why not scroll down the page and see which sump pumps have a water flow rate of 58 - 84 GPM or 3,480 - 5,400 GPH (gallons per hour).
Key Facts About Gallons Per Minute
- Manufacturers measure gallons pumped by gallons per minute (GPM) or gallons per hour (GPH). GPH is calculated by multiplying GMP by 60 (number of minutes in an hour). GPM is calculated by dividing GPH by 60 (number of minutes in an hour).
- We present pumping capacity by gallons per minute or minute per hour.
- If gallons pumped per minute is desired, divide gallons per hour by 60.
- The pumping lift varies per pump application. We have chosen a 10 ft lift because that is most common. If your lift is less than 10 ft, the pumping capacity will increase up to 20% more. For example, at 10 foot lift the Flotec E75VLT pumps 67 gallons per minute. At a 5 foot lift the Flotec E75VLT pumps 80 gallons per minute. At ten feet the Liberty 297-2 pumps 71 gallons per minute. At 5 ft. lift the Liberty 297-2 pumps 78 gallons per minute.
- The vertical height of the discharge piping system makes a difference. Make sure you measure your vertical-piping so the published performance water flow rate charts will be useful. Most pump manufacturers provide GPM at 0 vertical-height, 5 feet vertical height and 10 feet vertical height.
- Make sure you know the amount of water entering your sump pump basin in one minute during a heavy rainstorm. Buying a sump pump with a high GPM when you only need a pump with low GPM is useless; in fact some pump motors like the one found in the Basement Watchdog BW1050 are timed and the pump will run 10 seconds once the float switch triggers the pump motor to run. If the water flow in your pump basin is not at least 54 GPM or your pump basin is too small to hold much water, the motor of the BW1050 will keep running until the 10 seconds is up even though there is no water to pump. A motor which runs without water to pump will burn out.
GPM, known as gallons per minute, is the volume of water that flows into a pump basin during one minute of time. This is the water flow rate. The water flow rate into the pump basin from the drain tile around the perimeter of the house determines the pumping rate at which the pump motor must be capable of pumping to keep the basin from over flowing.
Two things determine how fast the water is removed from the pump basin: the motor and the discharge system design. Generally the lower the motor horse power the lower the pumping capability. However, as mentioned above some one-half (0.5) HP sump pumps like Zoeller have the pumping capability of a 3/4 HP sump pump motor of other brands.
The vertical-height and horizontal distance and number of elbows making up the discharge system also affect the pumping capability. Most manufacturers only provide pumping capability based on the vertical-height of the discharge system. Water pumped vertically faces gravity resistance. For this reason manufacturers provide a performance chart designating how much water can be pumped per minute at a specific vertical-height. Some manufacturers like Zoeller provide performance capability based on total dynamic head which includes vertical, horizontal, elbow and check valve resistance. Here are the details for calculating total dynamic head Sump Pump Size Needed Calculation
- Measure the length of horizontal discharge piping, count the number of check valves, 45 degree and 90 degree elbows.
- Measure the diameter of your pump basin.
- During a heavy rainstorm measure how much water flows into the basin in one minute. If you measure for 15 seconds multiply the number of inches times four.
- Convert number of inches flowing into the pump basin to gallons of water. If the basin diameter is 18 inches, one inch equals one gallon of water. If the basin diameter is 24 inches, one inch equals two gallons of water. This will be the GPM. Multiply the GPM by 60 to obtain GPH (gallons per hour).
- Find a submersible sump pump that has a GPM flow rate compatible to your sump pump systems discharge vertical height.
- Take the horizontal discharge piping length, check valve and elbows friction calculation determined from the Sump Pump Size Needed Calculation and add this to your vertical height to determine the minimum shut off height required.
Why do you think you need a bigger pump? Is it because your current sump pump cannot keep up with the water flow coming into the pit? A bigger sump is not always the best solution. There may be other issues causing the problem such as ...
- Look at the area surrounding your home. Are you the lowest house? Is your street lower than the streets in your neighborhood?
- Does the soil around the foundation slope away from the foundation? Build up the soil to a nice slope around your house. Good run-off during a heavy rainstorm makes a big difference. Is there run off coming from somewhere else near your house? Maybe a rock bed is appropriate. It is amazing how something like this does make a difference.
- Is the existing sump pit too small? A 24 inch diameter pit generally holds twice as much water as an 18 inch diameter pit. Removing an existing good functioning drainage system may not be best solution. Instead why not add a sister pit next to the existing basin? We have a 4 inch PVC pipe connecting our main basin to the sister basin. When the main basin is too full the overflow goes to our sister pit and those pumps run. We have four operating pumps instead of two. Without those four pumps we would have had a flooded finished basement during the most recent 7 inch rainfall in two days.
- Is the pump-float ON OFF point too close together? Short cycling wears the motor out faster. Automatic pumps have a preset ON OFF point which cannot be customized; however tying the float to an ON position and installing an external switch is easy. Learn how to convert your sump pump system to an external float switch. An external electronic switch is most reliable. We installed ours in 2011 and it is still going strong even though it gets a lot of work out.
- The actual GPM for your sump pump system may be lower than the published performance curve from the manufacturer because your system has more than a check valve and one 90 degree PVC elbow fitting. Fittings and check valves create additional friction and lower the GPM.
- The pumping performance you think is needed may not be what is really needed. During a heavy rainstorm, check the flow rate and calculate what GPM is really needed.
- Buying a bigger pump with more GPM is not always the best solution. Make sure you check your existing system.
There are more features to be considered besides the fact that a sump pump can pump 58 - 84 gallons per minute. In fact there is a big difference between 58 and 84 gallons per minute so choosing the right size pump with the right amount of GPM is important.
- The warranty is not the same for all sump pumps with 58 - 84 GPM pumping capability.
- Pump housing varies by brand; cast iron is preferred; however some brands use stainless steel.
- Float switch types vary. The most common float switch type is the vertical. However tether float switches are also available though they require a wider sump basin.
- The way clogging is prevented varies by brand no clogging design. The most common design is a vortex impeller for high GPM pumps;; however bottom screens and top suction are also used.
Gallons Pumped Per Minute
The following pumps are listed in order of GPM from greatest to least @ 10 foot vertical height
Pump warranty gives the homeowner confidence that if a sump pump fails early, brand support will replace the pump. The length of warranty varies by brand and model. It is important to keep the receipt for proof of purchase and date.
5 Year Warranty
- Wayne CDU980, CDU980E, EE980 (3/4 HP, 58 GPM at 10 feet) and CDU1000 (1 HP, 66 GPM at 10 feet)
- Flotec E75VLT (3/4 HP, 67 GPM at 10 feet)
- Zoeller M95 (1/2 HP, 66 GPM at 10 feet)
- Glentronics S5050-ns, and S5050 (1/2 HP, 83 GPM at 10 feet)
3 Year Warranty
- Zoeller M98,N98, and 1096-0001 (1/2 HP, 61 GPM at 10 feet) and 1099-001 (3/4 HP, 62 GPM at 10 feet) and 1099-001
- Liberty 290, 293, 297 (3/4 HP, 72 GPM at 10 feet) and 280, 283, 287 (1/2 HP, 56 GPM at 10 feet)
- Glentronics S56050, S56050 (1/2 HP, 61 GPM at 10 feet) and ST1050 (1/2 HP, 72 GPM at 10 feet)
- Superior Pump 92571, 92581 (1/2 HP, 64 GPM at 10 feet) and 92731, 92751 (3/4 HP, 69 GPM at 10 feet)
- Flotec FPZT7450 (3/4 HP, 75 GPM at 10 feet)
- Little Giant 510852 (1/2 HP, 57 GPM at 10 feet)
Though the above sump pumps have a defined warranty period and their float switch will fail after so many pump cycles, their life can be extended by installing an electronic switch such as HC6000 were installed because this switch lasts over seven years; in offers a 5 year warranty.
We highly recommend the electronic switch HC600 (v2). We installed ours in 2011 and it has not failed yet. That's over 13 years ago. It just keeps measuring the water level in the basin and when the water reaches its highest prove, the controller starts the pump. We are so grateful we found this switch so many years ago and that it is so dependable.
Pump Housing
Housing used for sump pumps varies from cast iron, stainless steel, zinc and aluminum. When stainless steel, zinc or aluminum is used for the pump housing, the pump base is made of cast iron to add weight and keep the pump more stationary during continuous heavy pumping.
- Of these materials cast-iron lasts longest. Cast iron is epoxy coated to prevent rust, dissipates heat much better especially when there is continuous pumping, and is less likely to crack or wrap.
- Stainless steel heats up faster than cast iron but not as fast as aluminum or zinc.
- Zoeller, Liberty Pumps, Little Giant and Red Lion models consistently use cast iron for the pump housing, pump base. Zoeller also uses cast iron for the motor housing and switch case.
- Wayne pump models consistently use stainless steel for pump housing and cast iron for the pump base.
- Superior pumps use three types of housing materials: cast iron, stainless steel and thermoplastic.
- Flotec pumps use many types of housing materials: cast iron, stainless steel and aluminum.
The most common float switch types found on 84 GPM at 10 foot vertical height sump pump models is the tether and vertical float switch.
Vertical Float Switch
- Vertical float switches use two design types: magnetic vertical reed float switch and the snap action float switch.
- The vertical float switch offers more protection from float hang-up with its float guard. Such protection cannot be offered by the tether float because it needs freedom to swing up and out as the water rises in the sump basin. In contrast the vertical float movement is very controlled. It only moves up and down on a vertical rod.
- The vertical magnetic reed float switch is affected by contaminates such as calcium carbonate found in the ground water that flows into the sump basin. Not all terrains have a high concentration of calcium carbonate which collects on the float rod and its connection causing the float connection to either fail to engage the switch or disengage from the switch. One way to prevent float switch failure is to periodically clean the float and its connection with a vinegar water solution.
- The snap action float switch is not affected by calcium carbonate contamination because the float switch connection occurs within an enclosed switch case. The snap action vertical float is tested to work for 1 million pump cycles. Recently Zoeller upgraded their 2-pole snap action vertical float switch in Models M63 and M95 so it now lasts for 3 million pump cycles. That's a lot of pumping.
- For most home owners it will last well over 10 years before failing. Even if the upgraded model pumped 365 days once every minute for 24 hours a day hour that would only be 525,600 pump cycles.
Tether Float Switch
- The tether float switch is not affected by contaminates in the ground water because its reed float switch is enclosed in the float.
- Several years ago we used the magnetic vertical float switch and experienced switch failure every 2 - 3 years. Finally be discovered calcium carbonate was contaminating our float connection and causing pump failure. Once we switched to using a snap action float switch, our switches last 9 years before needing replacement.
Float Swtich Type by Brand Model
- The Zoeller, Liberty and Wayne floats are most reliable because they have a top guard protecting the float from getting tangled or caught; they have an arm anchor at the bottom to prevent swaying; they are puncture proof.
- The Superior and Flotec pumps can be run manually if the float-switch fails. Just unplug the piggyback and plug the motor cord directly into the wall socket. Of course the pump cord must be pulled every time the water in the basin goes below the impeller; however in an emergency you still have a pump to use.
- The life of nay sump pump can be extended by installing a replacement switch or installing an electronic switch. We installed a replacement switch for our Zoeller M53 and an electronic switch Hydrocheck HC6000 for one of our other sump pumps. The Hydrocheck HC6000 is so very dependable. Ours has been running without fail for 13 years. Its performance is remarkable. If the two high low sensors are installed on a separate 1/2 inch PVC pipe attached to the primary PVC discharge pipe so proper grounding will occur. Proper grounding is key to its reliability.
It is important to note if there are small solids in the sump basin because manufacturers choose to handle them differently.
- Zoeller, Liberty, Little Giant, and Superior Pump use a vortex impeller that is capable of swirling small spherical solids through the impeller, the pump changer and out the discharge pipe.
- Wayne sump pumps do not have a vortex impeller; thus they do not handle solids. The solids remain on the bottom of the sump basin. Their pump models use top suction.
- Some Flotec and Glentronics (Basement Watchdog) sump pump models use a vortex impeller. Others use a bottom screen such as Glentronics model S5050.
Cord Length
Usage of extension cords is not recommended; thus it is important to know the length of cord needed.
Questions About Sump Pump Gallons Per Minute 58 to 84 GPM
It is natural to have questions about gallons per minute and horse power and how they relate to your water pumping situation. The most common questions are answered below.
How Many GPM Sump Pump Do I Need?
The typical answer is based on soil type and house size. For every 1,000 square foot of home on sandy soil, 14 gallons per minute is pumped during heavy rain storms. On dirt soil, around 10 gallons is pumped every minute. On clay soil, 8 gallons is pumped per minute during heavy rains. To be more accurate, the next time it rains, count how many times the pump runs in one minute; subtract the difference in inches between ON and OFF and multiply it by number of times per minute. This indicates how much water your sump pumps is pumping.
How Many Gallons Per Hour Does A 1/3 HP Sump Pump Remove From the Basin?
Keep in mind that not all 1/3 HP sump pumps move the same amount of water. The number of gallons a 1/3 HP pump can move away from you home ranges from 1,320 to 2,640 gallons per hour or 22 to 44 gallon a minute at a 10 foot vertical height.
What Is Better 1/3 HP Or 1/2 HP Sump Pump?
A 1/2 HP is better for those living in areas where the water table is high causing the pump to run even when it isn't raining or the house is sitting low or its neighborhood is low compared to the areas around it. A 1/3 HP pumping performance ranges from 22 to 44 gallons per minute. A 1/2 HP pumping performance ranges from 23 gallons to 72 gallons per minute at a ten foot vertical lift. It is important to review the manufactures published pump performance chart.
Quick Shop Sump Pumps With 58 - 84 GPM
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