What Is a Pedestal Sump Pump?
A pedestal sump pump is a drainage pump with its motor mounted above the sump pit, while a shaft and impeller reach down to move water out. Its exposed motor stays above pit water, and a float switch starts and stops the pump as water levels change.
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A pedestal sump pump is a drainage pump with its motor mounted above the sump pit, while a shaft and impeller reach down to move water out. Its float switch starts the pump when water rises and stops it after the level falls.
That upright design can be useful when a pit is narrow or when you want the motor above the water. To choose one, check pit dimensions, float clearance, discharge size, and the water volume your basement needs to move.
What is a pedestal sump pump, and how is it built?
A pedestal sump pump has a motor above the basin and a pump at the bottom of a long column. The pump draws water from the pit and sends it through a discharge line.
A float switch controls the cycle. As water rises, the float lifts and turns the pump on; once the water drops, the switch turns it off.
The motor remains outside the pit water, but it still needs protection from splashes and damp conditions. The sump cover, power cord, and nearby electrical connections should follow the pump maker's installation instructions.
What is a pedestal sump pump's float switch?
A pedestal pump's float switch is a moving control that turns the pump on and off at set water levels. Some models use a float attached to a rod, while others use a different float arrangement.
For example, the Star 3CEH has an adjustable on/off float and rod-type switch. The Red Lion RL-SP33PED uses an adjustable snap-action float switch that activates at 8 to 10 inches and shuts off at 3 to 5 inches.
Leave enough room for the float to travel without hitting the pit wall, pump shaft, wiring, or cover. A switch that catches can keep the pump from cycling as intended.
How does a pedestal pump move water?
A pedestal pump draws water through an intake near the bottom of the pit and pushes it into the discharge pipe. Its motor drives the pump through a shaft that extends down the column.
The pump runs only while the float switch calls for it. The discharge line carries water away from the foundation to a safe outlet, so the outlet location and pipe setup matter as much as the pump itself.
For the broader sequence, see how a sump pump works. That guide explains how the pit, float, pump, and discharge line work together.
Why choose a pedestal sump pump?
A pedestal pump can be a practical choice when the sump basin is narrow or you want the motor above the pit water. Its upright column also leaves the motor accessible for inspection.
The Red Lion RL-SP33PED fits basins at least 13 inches in diameter. The Star 3CEH is described as fitting a 12 inch diameter pit, which may suit a basin where a larger footprint is a concern.
Before choosing, measure the basin opening and depth, then check where the pump base, column, float, and discharge pipe will sit. A pump that fits through the opening may still need more room for the float to move.
For a direct comparison of motor placement, noise, and pit fit, read pedestal vs submersible sump pumps.
What are the tradeoffs of a pedestal design?
The main tradeoff is that the motor and column remain visible above the pit, so you need enough headroom and a cover arrangement that allows access. The exposed motor may also be more noticeable during operation than a pump enclosed in the pit.
A pedestal pump can be awkward if the pit is covered tightly or located where the motor gets bumped. It also may not suit a basin with limited vertical clearance.
Submersible pumps sit lower and keep the motor out of sight, but they occupy space inside the pit. The right choice depends on basin shape, access, and the pump's stated basin requirements.
What should you check before buying one?
Start with the pit's diameter, depth, and clearance for the float. Then compare pump capacity and discharge connection with the drainage conditions and pipe already installed.
A few checks can prevent a poor fit:
- Measure the basin's inside diameter and usable depth.
- Confirm the minimum basin size for the pump.
- Check that the float and rod can move without obstruction.
- Match the pump's discharge connection to the planned pipe.
- Read the installation instructions for outlet routing and electrical setup.
The Zoeller Old Faithful 84 is a 1/2 HP pedestal pump with a 1 1/2 inch FPT discharge and an adjustable 12 inch cycle, factory set at 9 inches. Its maker describes it for indoor residential or light commercial dewatering, and says the motor mounts above the pit cover.
The pump's listed maximum on level is 16 inches and minimum off level is 4 inches. Check the pit depth and switch travel against those levels before choosing.
For help matching motor size to basement conditions, see how to determine sump pump size. To compare the basin's dimensions with common installations, use how deep a sump pit should be.
Which pedestal sump pump details matter most?
The best fit depends on basin size, float clearance, and the pump's intended water-removal capacity. These three models show how pedestal pumps can differ in dimensions and controls.
- Red Lion RL-SP33PED: 1/3 HP, adjustable snap-action switch, 13 inch minimum basin diameter, and 1-1/4 inch FNPT discharge.
- Star 3CEH: 1/3 HP, adjustable rod-type float, 12 inch pit fit, and 1-1/4 inch discharge.
- Zoeller Old Faithful 84: 1/2 HP, adjustable 12 inch cycle, and 1 1/2 inch FPT discharge.
These details describe different configurations, not a universal ranking. Compare them with your pit and discharge system, and follow the instructions for installation and maintenance.
When should you choose a pedestal sump pump?
Choose a pedestal model if your basin is narrow, the motor can stay clear above the pit, and the float has room to move. A submersible model may suit you better if you need the motor enclosed inside the pit or want a less visible installation.
Measure first, then compare the switch cycle and pipe connection with your existing setup. For more options and fit notes, see our pedestal sump pump guide; for the rest of the site’s pump advice, visit the sump pump selection guide.
Frequently asked questions
What is the difference between a pedestal and submersible sump pump?
A pedestal pump keeps its motor above the pit, with the pump end and shaft below; a submersible pump places its motor and pump body in the pit water. Pedestal models can suit narrow basins, but check the pump's footprint, float movement, and required basin dimensions before choosing.
Does a pedestal sump pump sit in the water?
The lower pump section sits in the sump pit, but the motor is mounted above it. Keep the motor and electrical connection clear of water, spray, and damp conditions as directed by the manual, and make sure the pit cover and float do not obstruct the shaft.
How does a pedestal sump pump turn on?
A float switch rises with the water and activates the pump at its set level; it stops after the water drops to the switch's shutoff point. The exact on and off levels vary by model, so confirm the cycle and leave enough room for the float to move freely.
Are pedestal sump pumps good for narrow pits?
They can work well in narrow pits because the motor stays above the basin and the pump assembly takes less room than many submersible designs. Check the minimum basin diameter and the float's path, since a narrow pit can still prevent a switch from moving freely.
