As an affiliate, we may earn a commission from qualifying purchases. We get commissions for purchases made through links on this website from Amazon and other third parties.
A good portable pump for transferring water is one that matches the water source, lift height, hose size, power source, and required flow rate. For most rain barrels, IBC totes, tanks, and cisterns, a small utility or transfer pump works well. If the pump must lift water from below ground level, push it a long distance, or run sprinklers, you may need a stronger pump.
The best choice is not simply the pump with the highest flow rating. A pump that is too large can waste power, stress hoses, or empty a small tank too quickly. A pump that is too small may barely move water once hose length and elevation are added.
What Type of Portable Water Pump Do You Need?
Several pump types can transfer stored rainwater. Each works best in a different situation.
Portable Utility Pump
A portable utility pump is a common choice for moving water between containers or sending water through a garden hose.
It can work well for:
- Rain barrels
- IBC totes
- Above-ground storage tanks
- Temporary irrigation setups
- Moving water from one tank to another
Some utility pumps are submersible, meaning the pump sits in the water. Others stay dry and draw water through an inlet hose.
A utility pump is usually a good starting point when the goal is simply to move water rather than create high pressure.
Submersible Pump
A submersible pump sits inside the tank or cistern.
This can be useful when water must be lifted from:
- A deep tank
- A buried cistern
- A sump
- A large storage container
Because the pump is already underwater, it usually does not need to pull water through a suction hose.
Check the pump's maximum lift before choosing one. A small submersible pump that works well in a shallow barrel may not move much water from a deep cistern.
Surface Transfer Pump
A surface pump stays outside the water and draws water through an intake hose.
It can be useful when you want:
- Easy access for maintenance
- A pump that can move between tanks
- Higher flow than a small submersible pump
- Connections to standard hoses or piping
Surface pumps must be able to prime properly. Priming means filling the pump and suction line with enough water for the pump to begin drawing water.
Air leaks on the suction side can cause poor performance or prevent the pump from working at all.
Battery-Powered Transfer Pump
A cordless or battery-powered pump can be useful where electrical outlets are unavailable.
It may be convenient for:
- Garden watering
- Remote tanks
- Small rainwater transfers
- Temporary setups
- Cabins or sheds
Battery pumps are portable, but runtime and flow can fall as the battery drains. They are usually better for occasional transfers than for moving very large amounts of water.
Gas-Powered Water Pump
Gas-powered pumps can move large amounts of water quickly and do not require grid electricity.
They are generally better suited to:
- Large tanks
- Farm or property use
- Long transfer distances
- High-volume water movement
They are usually more pump than a typical rain barrel needs.
Gas engines also produce carbon monoxide. Never run a gas-powered pump indoors, inside a shed, or in another enclosed space.
Start With the Flow Rate
Flow rate describes how much water a pump can move during a certain amount of time. It is often listed in gallons per minute, or GPM.
For example, a pump moving 5 gallons per minute could theoretically transfer 50 gallons in about 10 minutes.
Real-world flow is usually lower than the pump's maximum rating.
Flow decreases when the pump must:
- Lift water uphill
- Push water through a long hose
- Move water through narrow fittings
- Push through filters
- Supply sprinklers or other restrictive devices
A high advertised flow rate may only apply when the pump is moving water with very little resistance.
Check the Head Height
Head height is the amount of vertical lift a pump must overcome.
If water starts in a ground-level tank and must reach a garden 15 feet uphill, the pump must overcome roughly that vertical difference, plus losses from the hose and fittings.
Pump specifications often include a maximum head.
Maximum head does not mean the pump will provide its full flow at that height. Flow normally drops as head increases. At the pump's maximum head, useful flow may be very low.
When comparing pumps, look for a pump performance chart if one is available. It shows how much water the pump can move at different head heights.
Consider the Hose Length and Diameter
A pump can lose a surprising amount of performance through a long or narrow hose.
A short, large-diameter hose usually allows better flow than a long, narrow one.
For example, moving water through a short hose beside an IBC tote is much easier than pushing it 150 feet across a property.
Try to avoid unnecessary restrictions such as:
- Very small hose fittings
- Multiple reducers
- Sharp bends
- Partly closed valves
- Dirty screens
- Clogged filters
The pump's inlet and outlet sizes should also match the rest of the system as closely as practical.
Decide Whether You Need Flow or Pressure
Moving water and producing pressure are not exactly the same job.
If you are transferring water from one tank to another, you mainly need adequate flow.
If you are operating:
- Sprinklers
- Spray nozzles
- Drip irrigation regulators
- Household fixtures
- Pressure tanks
you also need enough pressure.
A high-flow transfer pump may not produce the pressure required by a sprinkler system. Likewise, a pressure pump may be unnecessary if you only need to empty one barrel into another tank.
Check the pressure requirements of anything connected downstream before choosing the pump.
Make Sure the Pump Can Handle the Water
Rainwater often contains small bits of dirt, leaves, grit, or organic material.
Many small transfer pumps are intended for relatively clean water. Sediment can clog or damage them.
A basic rainwater system may use:
- A gutter screen or leaf guard
- A first-flush device where appropriate
- A tank inlet screen
- A pump intake screen
A first flush diverts some of the initial roof runoff so that part of the dust and debris washed from the roof does not immediately enter storage.
If the stored water contains visible sediment, consider keeping the pump intake above the bottom sludge layer rather than drawing from the lowest point in the tank.
Do not assume that a pump labeled for clean water makes collected rainwater safe to drink.
Choose a Suitable Power Source
Portable pumps may run from household electricity, batteries, vehicle electrical systems, or gasoline engines.
Corded Electric Pumps
These are convenient when an outlet is nearby and can provide steady power for longer transfers.
Water and electricity require extra care. Use equipment intended for the environment, follow the manufacturer's electrical instructions, and use appropriate ground-fault protection where required.
Account for recommended transfer pumps for rainwater tanks, barrels, and tank-to-tank moves to compare unstable output associated with inlet-side restrictions.
Do not use damaged extension cords or electrical connections where they can sit in water.
Battery Pumps
Battery pumps are easy to move and avoid long extension cords.
Check:
- Battery voltage
- Expected runtime
- Whether batteries are included
- Flow under actual pumping conditions
A battery-powered pump may be ideal for occasional garden use but inconvenient for transferring hundreds of gallons at a time.
Look for Dry-Run Protection When It Matters
Some pumps can be damaged if they continue running after the tank becomes empty.
This is called dry running.
Dry-run protection can shut the pump off when water is no longer available. It can be especially useful with:
- Small tanks
- Automatic irrigation systems
- Pumps that are not constantly watched
- Tanks that may run low during dry periods
If the pump does not have automatic protection, the operator needs to make sure it is shut off before the intake runs dry.
Check the Connections Before Buying
Many pump problems come from fittings rather than from the pump itself.
Before choosing a pump, check:
- Pump inlet size
- Pump outlet size
- Tank fitting size
- Hose diameter
- Hose thread type
- Whether adapters are needed
- Whether the pump requires a rigid suction hose
An IBC tote, for example, may have a large outlet valve that requires an adapter before it can connect to a garden hose or pump intake.
A bulkhead fitting is a fitting installed through the wall of a tank to create a sealed pipe or hose connection. If you are adding a new tank outlet, make sure the tank material and fitting are suitable for the intended installation.
A Practical Pump Size for Common Rainwater Jobs
There is no single correct pump size, but the intended job gives you a useful starting point.
| Water-transfer job | What usually matters most |
|---|---|
| Moving water between nearby rain barrels | Low to moderate flow, simple hose connections |
| Emptying an IBC tote | Moderate flow and suitable outlet connections |
| Moving water from a cistern | Adequate lift and head capacity |
| Watering through a garden hose | Moderate flow and usable pressure |
| Running sprinklers | Pressure and flow at the same time |
| Pumping uphill | Head capacity |
| Moving water long distances | Flow under friction loss |
| Remote garden use | Battery runtime or another practical power source |
Do not choose a pump from maximum GPM alone. Check how much flow remains at the height and distance your system requires.
Example: Moving Water From an IBC Tote to a Garden
Suppose an IBC tote sits near a shed and the garden is 75 feet away.
If the garden is roughly level with the tote, a modest transfer pump may be enough.
You would still need to check:
- The tote outlet connection
- Pump inlet and outlet sizes
- Hose diameter
- Total hose length
- Desired watering flow
- Whether a sprinkler or open hose will be used
If the garden is 20 feet uphill, head height becomes much more important.
If a sprinkler needs a certain pressure, the pump must provide both the required flow and pressure at the end of the hose.
This is why the same pump may work well with an open garden hose but poorly with a sprinkler.
What About Drinking Water?
Use extra care if rainwater will be transferred for drinking, cooking, or other potable uses.
Potable means water intended to be safe for drinking. Non-potable means water not intended for drinking, such as water used for some types of irrigation or cleaning.
A pump used in a potable-water system should have materials and components suitable for that use. Hoses, tanks, fittings, seals, and other wetted parts also matter.
However, choosing a suitable pump does not make collected rainwater safe to drink.
Drinking-water use should be treated as a complete system involving suitable collection surfaces, debris control, storage, treatment, maintenance, current laboratory testing, and applicable local requirements. A qualified water-treatment professional can help design or review systems intended to supply drinking water.
Do You Need a Filter Before the Pump?
Sometimes.
A coarse intake screen can help keep larger debris out of the pump.
Very fine filters are usually better placed according to the overall system design rather than simply installed wherever they fit. A fine filter on the suction side can become restrictive as it collects debris and may make it harder for some pumps to draw water.
For irrigation water, the filter requirements also depend on the equipment downstream. Drip emitters, for example, can clog from particles that would pass harmlessly through an open garden hose.
The right filter setup depends on both the pump and the final use of the water.
Think About Cleaning and Maintenance
Portable pumps still need routine attention.
Check periodically for:
- Clogged intake screens
- Debris inside hoses
- Loose hose connections
- Suction-side air leaks
- Damaged power cords
- Leaking seals
- Reduced flow
- Unusual pump noise
Storage tanks also need maintenance. Sediment can collect on the bottom over time, while screens, gutters, and prefilters can become clogged.
A clean pump cannot correct problems caused by a neglected collection and storage system.
Protect the Pump From Freezing
Water left inside a pump, hose, filter, or fitting can freeze and expand.
That can crack housings and fittings.
In freezing climates, follow the pump manufacturer's winterization instructions. Depending on the system, this may involve draining exposed equipment or moving portable components to a protected location.
Do not assume that insulation alone will prevent freeze damage.
A Good General Choice
For typical homeowner rainwater transfer, a portable clean-water utility or transfer pump with enough head for the elevation, compatible hose connections, and the right power source is usually the most practical choice.
For a simple barrel or IBC tote setup, prioritize:
- Easy hose connections
- Enough flow for the task
- Adequate head height
- A screened intake
- Dry-run protection when useful
- A practical power source
For deeper cisterns, uphill pumping, long hose runs, or irrigation systems that require pressure, size the pump from the actual lift, flow, pressure, and pipe or hose conditions rather than choosing by maximum GPM alone.
Frequently Asked Questions
What size pump do I need to transfer water from a rain barrel?
A small utility or transfer pump is often enough for a rain barrel if the water only needs to travel a short distance. Check the required lift, hose length, and desired flow rather than choosing solely by the pump's maximum GPM rating.
Can I use a garden hose with a portable water pump?
Yes, if the pump outlet is compatible with a garden hose or can be connected using the correct adapter. Remember that a long or narrow hose can reduce flow considerably.
Can a portable pump run a sprinkler?
Some can, but the pump must provide enough pressure and flow at the sprinkler. A pump that transfers water quickly into an open container may still lack enough pressure for a sprinkler.
Is a submersible pump better than a surface pump?
Neither is always better. A submersible pump is convenient for deep tanks and cisterns because it pushes water upward. A surface pump is easier to access and move but must be able to draw water reliably through its suction line.
Can I pump rainwater directly from an IBC tote?
Yes, provided the tote outlet, pump inlet, hoses, and adapters are compatible. Keep debris and heavy bottom sediment away from the pump intake when possible.
What does maximum head mean on a water pump?
Maximum head is the greatest vertical height the pump is rated to overcome under its test conditions. The pump normally delivers less water as head increases, and useful flow may be very low near the maximum.
Can I use the same pump for drinking water?
Only if the pump and all wetted components are suitable for potable-water use and the rest of the system is designed appropriately. A suitable pump alone does not make collected rainwater safe to drink. Potable rainwater use requires a complete collection, treatment, maintenance, and testing plan.
