The Complete Caravanners’ Guide To Carrying Water

Water is life on the road. Get your water storage wrong and you’ll either run dry in remote areas or haul unnecessary weight that kills your fuel economy and puts stress on your rig. The challenge isn’t just how much water to carry — it’s understanding the different systems, knowing what works for your travel style, and getting the setup right from day one.

Whether you’re planning weekend trips to caravan parks or extended remote camping, your water storage system needs to match your ambitions. Here’s everything you need to know about carrying water in your caravan, from basic tank setups to advanced filtration systems.

Tank Types: Plastic vs Stainless Steel vs Flexible

Your fresh water tank is the foundation of your entire water system. Get this wrong and everything downstream suffers. The three main options each have distinct advantages that suit different travel styles.

Polyethylene Plastic Tanks

Plastic tanks dominate the caravan market because they’re light, cheap, and don’t corrode. Most caravans under $80,000 come with white polyethylene tanks ranging from 95 to 180 litres. The trade-off is durability — cheaper tanks can crack under stress, especially around fittings.

Quality plastic tanks use UV-stabilised polyethylene with threaded metal inserts around fittings. Avoid tanks where fittings screw directly into the plastic — they’ll leak within two years of regular use.

Stainless Steel Tanks

Stainless steel tanks are the premium choice. They’re virtually indestructible, don’t affect water taste, and handle temperature extremes without cracking. The downsides are weight (roughly 40% heavier than plastic) and cost (2-3x the price of equivalent plastic tanks).

Most high-end caravans over $120,000 specify stainless steel tanks. They’re particularly valuable if you’re planning extended off-grid camping where tank failure isn’t just inconvenient — it’s dangerous.

Flexible Bladder Tanks

Flexible bladder tanks are the wild card option. Made from reinforced vinyl or rubber, they conform to available space and can squeeze into awkward spots where rigid tanks won’t fit. They’re popular for under-bed installations or as auxiliary tanks.

The catch is durability. Most bladder tanks last 3-5 years before developing leaks, and they’re vulnerable to puncture damage. They work well as temporary solutions or secondary tanks, but we wouldn’t recommend them as your primary water source.

How Much Water Do You Actually Need?

Water capacity planning is where most caravanners get it wrong. Too little water limits your freedom to explore remote areas. Too much water means hauling unnecessary weight and reducing payload for other essentials.

Daily Water Usage by Travel Style

Your water consumption varies dramatically based on how you travel. Here’s what we see across different camping styles:

• Caravan park touring: 50-80 litres/day (2 people) — You’ll use park facilities and can refill daily
• Mixed camping (parks + free camps): 30-50 litres/day — Conservative usage with occasional park access
• Extended free camping: 20-35 litres/day — Efficient water management with recycling systems
• Remote off-grid camping: 15-25 litres/day — Military-level conservation with filtration systems

Tank Size Sweet Spots

After analysing hundreds of Big Lap setups, these capacity ranges work best for different travel styles:

• 100-120 litres: Weekend warriors and caravan park tourists
• 140-180 litres: Mixed camping with 3-4 days between refills
• 200-280 litres: Extended free camping with conservation practices
• 300+ litres: Remote area specialists with water purification

Remember these numbers include grey water capacity. If you’re planning serious remote camping, budget 40-60% of your fresh water capacity for grey water storage.

Pressure Systems: 12V vs Manual vs Accumulator

Water pressure systems determine how your water flows from tank to tap. The right system depends on your power budget, water usage patterns, and reliability requirements.

12V Diaphragm Pumps

Most caravans use 12V diaphragm pumps. They’re simple, reliable, and provide consistent pressure across multiple outlets. Quality pumps like the Shurflo 4008 Revolution ~$180 deliver 11 litres per minute at 40 PSI — enough for two taps running simultaneously.

The main downside is power consumption. A typical 12V pump draws 7-8 amps when running, which adds up quickly if you’re running water frequently. Smart pumps with variable speed control reduce power draw by 30-40% compared to fixed-speed models.

Manual Foot Pumps

Manual foot pumps are the backup choice for power-conscious campers. They use zero battery power and never fail electronically. The Whale Gusher 10 ~$95 is the gold standard — it delivers 570ml per stroke and builds decent pressure for kitchen and bathroom use.

Manual pumps work well as primary systems if you’re camping solo or as couples with minimal water needs. They’re also excellent backup systems for extended remote camping where pump failure could be catastrophic.

Accumulator Tank Systems

Accumulator tanks store pressurised water to reduce pump cycling. When you turn on a tap, the accumulator supplies the first few litres before the pump kicks in. This reduces power consumption and extends pump life.

Accumulator tanks are most valuable if you use water in short bursts — washing hands, teeth brushing, quick rinses. They’re less helpful if you regularly run water for extended periods like long showers or dishwashing.

Water Filtration: When and What You Need

Water filtration divides into two camps: improving tank water quality and making untreated water safe to drink. Your filtration needs depend entirely on your water sources and travel plans.

Basic Sediment and Chlorine Removal

Most town water in Australia is safe to drink but tastes terrible due to chlorine treatment. A simple carbon filter removes chlorine taste and odour plus basic sediment. These filters cost $30-60 and last 6-12 months depending on usage.

Install inline filters between your tank and pump, or use tap-mounted filters for drinking water only. The Puretec CR-P1 ~$45 handles 10,000 litres and significantly improves water taste without complex installation.

UV Sterilisation Systems

UV sterilisers kill bacteria, viruses, and other pathogens without chemicals. They’re essential if you’re sourcing water from bores, creeks, or questionable town supplies. Quality UV systems like the Sterilight S1Q-PA ~$320 treat 2 litres per minute with 12V power.

Reverse Osmosis Systems

Reverse osmosis (RO) systems are the nuclear option for water purification. They remove virtually everything — minerals, chemicals, pathogens, salt — leaving pure H2O. Marine-grade RO systems can even process seawater into drinking water.

The trade-offs are significant. RO systems waste 3-4 litres of water for every litre produced, require high pressure pumps, and need regular membrane replacement. They’re only worth considering if you’re planning extended remote travel with questionable water sources.

Hot Water Systems: Instant vs Storage

Hot water systems fall into two camps: storage systems that heat and hold water, and instant systems that heat water on demand. Each approach has distinct advantages for caravan use.

Gas Storage Water Heaters

Gas storage systems are the caravan standard. They heat 15-25 litres of water and maintain temperature automatically. The Suburban SW6DE ~$580 delivers reliable hot water for 2-3 people with minimal maintenance.

Storage systems work well if you use hot water in concentrated bursts — morning showers, evening dishwashing. They’re less efficient if you need hot water sporadically throughout the day because they maintain temperature continuously.

Instant Gas Water Heaters

Instant systems heat water on demand using gas burners. They provide unlimited hot water without storage tanks, saving space and weight. The Rinnai Infinity 16 ~$1,200 delivers 16 litres per minute of hot water indefinitely.

The catch is complexity. Instant systems need precise gas regulation, electronic ignition, and adequate ventilation. They also struggle with low water pressure — if your 12V pump delivers less than 6 litres per minute, instant systems won’t activate properly.

Electric Boost Elements

Many storage water heaters include electric boost elements for powered site use. They heat water using 240V mains power instead of gas, saving LPG and providing silent operation. Electric boost typically takes 45-60 minutes to heat a full tank versus 15-20 minutes on gas.

Tank Monitoring: Gauges vs Sensors vs Apps

Knowing how much water you have remaining prevents the unpleasant surprise of running dry mid-shower. Modern monitoring systems range from basic gauge panels to smartphone apps with predictive analytics.

Traditional Gauge Panels

Basic 12V gauge panels show tank levels via LED bars or analogue meters. They’re cheap, reliable, and easy to understand at a glance. Quality panels like the BEP 12V Tank Gauge ~$85 use resistive senders for accuracy within 5-10%.

The limitation is precision. Most gauges show quarters or fifths of tank capacity, which means uncertainty of 20-40 litres. That’s fine for large tanks but problematic when trying to manage tight water budgets.

Digital Monitoring Systems

Digital systems provide precise readings, often to the litre. The Victron BMV-712 ~$340 monitors multiple tanks simultaneously and calculates daily usage trends. Some systems integrate with smartphone apps for remote monitoring.

Smartphone Integration

Premium monitoring systems connect to smartphone apps via Bluetooth or Wi-Fi. Apps can track usage patterns, predict remaining autonomy, and send alerts when tanks need attention. The convenience is significant, but adds complexity and potential failure points.

Systems like the Garnet SeeLevel N2 ~$650 provide comprehensive tank monitoring with smartphone integration, but they’re overkill unless you’re managing complex water systems with multiple tanks and recycling capabilities.

Installation Considerations and Gotchas

Water system installation involves more than connecting pipes. Poor installation leads to airlocks, pressure problems, and contamination issues that can ruin your entire trip.

Tank Placement and Support

Water weighs 1kg per litre. A full 200-litre tank weighs 200kg plus the tank weight itself. Your chassis and mounting system must handle this load plus road shock and cornering forces.

Tank placement affects centre of gravity and weight distribution. Ideally, locate tanks forward of the axle centreline and as low as possible. Avoid placing heavy water tanks at the extreme rear — this creates pendulum effects that make caravans unstable at highway speeds.

Plumbing Layout and Pressure

Proper plumbing prevents airlocks and ensures consistent pressure across all outlets. Run supply lines with gentle slopes toward the pump to prevent air pockets. Install the highest point vent to allow air escape during filling.

Use 20mm pipe for main supply lines and 15mm for individual taps. Smaller pipes create pressure drops and restrict flow when multiple taps run simultaneously. Quality fittings cost more upfront but prevent leaks that damage your van’s interior.

Winterisation and Freeze Protection

Water expands 10% when frozen, which destroys tanks, pipes, and fittings. If you’re travelling through areas with sub-zero temperatures, your system needs freeze protection.

Options include tank heaters, pipe insulation, or complete system drainage. Permanent freeze protection adds weight, complexity, and power consumption. Many Big Lappers simply avoid cold areas during winter rather than engineering complex freeze protection systems.

Our Water System Recommendations

After reviewing hundreds of Big Lap setups and talking to experienced caravanners, here are our water system recommendations for different travel styles.

Best Value Setup: Mixed Camping System

For most Big Lappers, a 160-litre quality plastic tank with 12V pump and basic filtration hits the sweet spot. This provides 4-5 days of autonomy with conservative water use, handles mixed caravan park and free camping, and doesn’t break the payload budget.

Premium Setup: Extended Remote System

Serious remote area travellers need redundancy and purification capability. A dual-tank setup with 300+ litres total capacity, stainless steel construction, backup manual pumps, and comprehensive filtration provides true autonomy for extended periods.

This setup costs $3,000-5,000 installed but enables camping in locations where water quality is questionable or availability is uncertain. The Stainless Steel Fabrications 250L Tank ~$850 paired with advanced filtration creates a bulletproof system for serious adventurers.