- What is a sump pump? How do sump pumps remove building water or prevent water entry?
- What types of sump pump can I buy?
- Where and how to install sump pumps
- How to inspect & maintain sump pumps to remove water from buildings or to prevent basement leakage or crawl space water entry
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This article explains the types of Sump Pumps, and describes how sump pumps should be installed, inspected, and maintained.. Citation of this article by reference to this website and brief quotation for the sole purpose of review are permitted. Use of this information at other websites, in books or pamphlets for sale is reserved
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Four Common Types of Sump Pumps
Sump pumps remove unwanted water, such as surface or ground water that leak into a building. A sump pump is normally installed in a pit at the low end of a basement or crawl space floor or in another location where water needs to be removed such as in a boiler pit or an outdoor well pit. Here we describe four types of pumps used to remove water from buildings or to lower water below a basement or crawl space floor to reduce the chances of water entry.
1. Submersible sump pumps
 Submersible sump pumps, such as shown in the photo at left, use a motor housed in a water proof enclosure and a separate float that turns the pump on and off.
The sump pump float contains a position-activated switch and is connected to the submersible pump by a flexible wire. Some submersible sump pumps, such as the one shown here at left, use other types of float switches.
The submersible sump pump motor is capable of working when entirely under water.
A submersible sump pump uses a float switch intended to turn the pump on when
ground water rises in the sump pit (or flows stupidly across your basement and into the pit) where it is discharged to a storm drain or the property surface.
Watch out for debris or wiring in the sump pit that block movement of the float switch - your sump may fail to turn on.
2. Pedestal Sump Pumps
 Pedestal sump pumps, such as shown in the photo at left, use a motor atop a pipe inside which the pump turns a shaft which operates the pump impeller. The pump impeller is located in a bottom pedestal which is under-water. You'll notice that the electric motor that powers the pump impeller is mounted on top a tall shaft that extends well out of the water itself.The float that turns the pump on and off usually looks suspiciously a lot like a toilet tank float, connected to a vertical rod.
Pedestal sump pumps are an older non-submersible type of pump used for removing water from buildings.
As rising water in the sump pit lifts the float, the float lifts the rod and the rod includes an adjustable screw-clamp fitting which pushes on the electrical contact of a mechanical switch to turn the pump on. As the water level drops the float falls and another screw-clamp fitting above the switch turns the pump motor back off.
3. Battery Backup Sump Pump Choices
Battery-backup sump pumps, use a rechargeable battery which is normally connected to live electrical power in order to remain fully charged. Shown here is a Sears battery-backup sump pump system which includes an marine-type automotive battery, battery charger, water sensor, an alarm.
- Sump pump Pumping rate: Sears says the pump can remove 10,520 gallons on one charge. Do the math. 10,520 gals / 14.5 hours = 721 gallons per hour. 721/60 = 12 gpm. Sears rates the pump at 18 gpm. As long as water is entering your building at or slower than this rate this pump would be adequate.
Sump pump Pumping time:
Sears also says the pump can run for 14.5 hours on one charge. If power outages in your area are longer than this you'll need an auxiliary power source or multiple staged batteries.
If electrical power fails, the batter can still operate the sump pump.
Sources of battery backup sump pumps:
 Battery-backup sump pump systems are made and sold by:
- Basement Watchdog battery backup sump pumps
- Base Products HydroPump battery backup sump pumps
- Gleason - Industrial Pro 1000 gph backup sump pump
- Hydropump DH 1800 Battery Backup Sump Pump - 1800 gph with 9 ft lift (shown in illustration at left)
- Little Giant Liberty 441 battery backup sump pump (similar to the Sears pump shown above)
- Sta-Rite Simer Flotec Omni A5000 emergency sump pump
- Wayne Security pump - 3300 gph battery backup sump pump and their 3540 gph pump have higher pumping capacity than some of the other models listed here
- Zoeller Zoeller-580-0005 Aquanot-I-Battery Backup Pump-- a pedestal sump pump design
We recommend this type of sump pump at homes where electrical power is frequently lost.
You're most likely to lose electrical power during a storm, which may be exactly when you most-need the sump pump, making battery backup sump pumps a good idea.
4. Water Powered Sump Pumps
 
 Water powered sump pumps, (as shown in the photos above or the sketch at left) use municipal water pressure and a venturi fitting to pick up and eject water from a building during flooding. Sketch shows the Aquanot pedestal pump - see PlumbingSupply.com listed below.
Usually water driven pumps are turned on manually by opening a water valve near the pump or by connecting a free-standing pump to a garden hose which in turn is connected to a hose bib. Water driven sump pumps work only where municipal water is provided . (In our opinion, running a water driven pump off of a home system may provide inadequate flow and risks overtaxing the well and pump system.)
Water powered sump pumps offer the advantage that the pump can operate when there is no electrical power.
Code legal? At least the older versions of these devices are illegal in many municipalities because their installation constitutes a cross-connection which can back-contaminate public water mains with unsanitary floodwaters. Before installing a water-powered sump pump check with your local building department to be sure it is permitted in your area. There may be newer versions that are code-approved: we invite more data and comment on this product.
Pump capability: the pumping capability of water driven pumps depends on the input water supply pressure and flow and the height that the water has to be lifted. Look closely at the flow rates claimed for the water driven sump pump you're considering and be sure it matches the pressure and diameter of the water supply piping to which you intend to connect it.
Water used: none of the water powered pumps we reviewed gave data on the volume of water that would be consumed from the municipal input source during a pumping operation. When a water powered sump pump says it can remove 900 gph, that number describes only the net additional water picked up by the pump, not the total water used from the municipal supply. If you're concerned about water consumption or water cost this approach may be need careful investigation.
Sources of water powered sump pumps include
- Aquanot pedestal pump (sketch above) from PlumbingSupply.com & plumbingworld.com This pump is intended to be operated by connection to a garden hose for its input water.
- Basement Saver water powered sump pump provides models from 900 to 2000 gph requiring 45 to 90 psi and supporting a 10-foot lift.
- Pump Biz water powered Water Commander or Pump Commander (shown at left) This water powered sump pump is designed to be connected to a 3/4" municipal water supply and is capable of removing up to 1,324 gph at 60 psi input pressure and a 10-foot lift.
- RadonSeal provides water powered sump pumps combined with a seal against radon gas leakage into a building at the sump pump pit.
- Wayne water powered sump pump Model EWP10 - Wayne is a large producer of many pump models
- Zoeller system-water powered pump Model 4065199 - Zoeller is a large producer of many pump models
Water & flooding alarm products are available in a variety of forms including battery-powered devices (we show one at Sewage Ejector Pump Grinder Pump) and even devices which can turn a light in a home or make a telephone call or inform an alarm company if a building is being subjected to flooding. Considering the very high cost of flood damage cleanup and mold remediation, we consider flood alarms a great idea for buildings which are often left unattended.
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SUMP PUMPS
Sump Pump Types
Sump Pump Single vs Duplex
Sump Pump Discharge
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