Introduction

So, you've got yourself a flexible water bladder—a smart move for camping and 4WD adventures. But now comes the next step: getting that water where you need it.

Whether you're transferring water from your bladder to a caravan tank, or using it to power a tap or shower, the key is choosing the right 12V pump for the job.

But not all pumps are created equal. The difference between water transfer and water pressure applications is huge—and picking the wrong one can leave you with poor performance or a burnt-out pump.

Let’s break down what you need to know.

🚰 Two Main Uses for 12V Pumps with Water Bladders

There are two common scenarios where you’ll use a 12V pump with a flexible water bladder:

1. Water Transfer

This is when you're moving water from the bladder to another container or tank. Examples:

• Transferring water to a caravan tank

• Emptying a bladder into jerry cans or roof-top tanks

• Filling gravity-fed systems at a remote camp

In this case, you're not trying to pressurize water—you just want to move it quickly and efficiently.

2. Water Pressure / Spray

This is when you're using the pump to create pressurised water flow. Examples:

• Running a tap or sink

• Operating a camp shower

• Hooking up a hose for cleaning

Here, you need a pump that maintains consistent pressure, not just flow.

⚙️ Choosing the Right Pump for Each Application

Let’s take a closer look at the key differences between pumps for each type of use.

✅ 1. Water Transfer Pumps

Purpose: Move water from one container to another, usually as quickly as possible.

What to Look For:

• High flow rate (L/min): Look for 12V pumps rated 10–20+ L/min

• Lower pressure (PSI): These pumps don’t need to build pressure, so ~10–20 PSI is enough

• Self-priming: Allows the pump to draw water even when the bladder is below the pump

• Run-dry protection: Prevents damage if the bladder runs empty

Ideal for:

• Transferring water from bladder to van or tank

• Filling containers

• Bulk water movement

🛠️ Tip: Use larger hose sizes (12mm or more) for faster transfers with less strain on the pump.

✅ 2. Pressure Pumps (Spray Applications)

Purpose: Deliver consistent, pressurized water for sinks, showers, taps, etc.

What to Look For:

• Pressure rating: Minimum 35–60 PSI for reliable tap or shower function

• Automatic pressure switch: Turns pump on/off when you open/close the tap

• Quiet operation: Some pumps come with rubber mounts or are diaphragm-style for low noise

• Pulsation dampeners or accumulators: Optional but helpful for steady flow without surging

Ideal for:

• Shower setups

• Washing dishes

• General camp water use with a tap or nozzle

🛠️ Tip: Mount close to your bladder with the shortest possible suction hose to prevent cavitation.

❌ What Happens If You Choose the Wrong Pump?

• Using a pressure pump for transfer only = wasted money, and it might cycle unnecessarily.

• Using a transfer pump for a shower or tap = weak or inconsistent flow, and no auto shut-off.

🔌 Power Considerations for 12V Pumps

Most camping pumps run directly from 12V battery systems. Keep in mind:

• Check the amp draw (especially for high-flow or pressure pumps)

• Use appropriate fuses and wire gauge

• Include an on/off switch or in-line controller

• Install a filter to keep debris out of the pump and fittings

🧰 Accessories to Consider

• ✅ Inline filters (for bladder outlets)

• ✅ Food-grade hoses (for potable water use)

• ✅ Quick-connect fittings (for fast setup and pack-down)

• ✅ Hose clamps or barb connectors to prevent leaks

• ✅ Flow restrictors for fine control in shower setups

🛒 Our 12V Pump Range

We stock a variety of high-quality 12V pumps suited for both transfer and pressure applications, including:

• 🚚 High-flow transfer pumps for moving water quickly

• 🚿 Compact pressure pumps for taps, showers & spray setups

• 🧰 Pump kits with fittings, filters and hose options

👉 Browse our 12V pump range here

🏕️ Real-World Example Setups

Caravan Water Transfer Setup:

• 240L water bladder

• 12V high-flow transfer pump (15L/min)

• 10m food-grade hose

• Inline filter

4WD Integrated Pump Camping Setup:

• 100L water bladder

• 12V pressure pump (60 PSI)

• Quick-connect splitter fitting

• 1x 5m hose to connect to shower unit

• 1x 7.5m coil hose with spray nozzle for cleaning and general decanting

Final Thoughts

Choosing the right 12V pump depends on how you intend to use your water bladder. Don't just grab the first one you see—take a few minutes to consider whether you need high-flow transfer or pressurised spray performance.

✅ For transfer: Go with a simple high-flow pump
✅ For pressure: Choose a pump with automatic shut-off and steady PSI

Need help picking the right pump for your setup? Get in touch or check out our full range of bladders, pumps, and camping water solutions.

👉 Shop Water Pumps Now