Travelling around Australia with your caravan means dealing with one fundamental reality: you need water, and lots of it. The average caravanning couple uses 80-120 litres per day, and finding reliable water sources isn’t always guaranteed in remote areas.
Your water carrying capacity directly affects where you can go and how long you can stay off-grid. Too little capacity and you’re tied to caravan parks and towns. Too much and you’re carrying unnecessary weight that reduces fuel economy and affects handling.
This guide breaks down everything from tank types and capacities to pumps, filtration, and monitoring systems. You’ll understand the trade-offs between different approaches and know exactly what setup matches your travelling style.
How Much Water Do You Actually Need?
Water consumption varies dramatically based on your habits, climate, and how long you stay in one place. Here’s what real caravanners actually use:
- Minimal users: 40-60 litres/day (navy showers, minimal washing up)
- Average couples: 80-120 litres/day (normal showers, regular cooking)
- Families with kids: 120-200 litres/day (longer showers, more washing)
- High users: 200+ litres/day (long showers, washing machine use)
Most manufacturers fit 80-120 litre fresh water tanks as standard. This gives average users one day of autonomy, which isn’t enough for serious remote travel.
Track your actual usage for a week at home before buying tanks. Fill a 20-litre jerry can and see how long it lasts for drinking, cooking, and basic washing.
For extended off-grid stays, aim for 3-5 days of water autonomy. That means 300-500 litres for average users, factoring in some conservation during dry camping.
Fresh Water Tank Types and Materials
Your fresh water tank choice affects weight, durability, taste, and installation complexity. Here are the main options:
Polyethylene Tanks
Most common and practical choice for caravans. Food-grade polyethylene doesn’t affect water taste and handles Australian UV well when properly treated.
~$280
Polyethylene tanks come in various shapes including slimline models that fit under caravans without affecting ground clearance. They’re repairable with plastic welding if damaged.
Stainless Steel Tanks
Premium option that’s completely taste-neutral and extremely durable. Stainless steel tanks resist algae growth better than plastic but cost 2-3 times more.
Custom fabrication is usually required, making them popular with high-end caravan manufacturers but less practical for retrofits.
Fibreglass Tanks
Lightweight and strong, but can develop stress cracks in flexible caravan chassis. More expensive than polyethylene with no significant advantages for most users.
Tank Placement and Configuration
Tank location affects weight distribution, accessibility, and protection from damage. You have several options:
Under-Floor Mounting
Most common setup for larger tanks. Keeps weight low and doesn’t eat into storage space. Requires careful mounting to prevent chassis flex damage.
Under-floor tanks must be mounted with flexible connections and proper support to handle chassis movement. Rigid mounting will crack tanks or fittings.
Internal Boot Mounting
Protects tanks from road hazards but takes up valuable storage. Common in smaller caravans where under-floor space is limited.
Multiple Tank Systems
Using 2-3 smaller tanks instead of one large tank offers flexibility. You can balance weight better and isolate problems if one tank fails.
~$180
Water Pumps and Pressure Systems
Your water pump determines flow rate, pressure consistency, and noise levels. Choose between basic demand pumps and sophisticated pressure systems.
12V Demand Pumps
Standard in most caravans. These pumps run whenever you open a tap and stop when pressure builds up. Simple and reliable but can be noisy and provide inconsistent pressure.
~$320
Accumulator Tank Systems
Add a small pressure tank to smooth out pump cycling. The pump fills the accumulator, which maintains pressure for small draws like hand washing without starting the pump.
Variable Speed Pumps
Premium option that adjusts pump speed based on demand. Much quieter than standard pumps and provides consistent pressure regardless of flow rate.
~$580
Install your pump as close to the tank as possible and use the largest practical hose diameter (usually 12mm). This reduces pump strain and improves flow rates.
Water Level Monitoring
Knowing how much water you have left prevents running dry unexpectedly. Basic gauge systems work but digital monitoring gives much better information.
Analogue Gauges
Simple float-based gauges show approximate levels. Cheap and reliable but not very accurate, especially when the caravan isn’t level.
Digital Tank Monitors
Electronic sensors provide accurate readings and can integrate with battery monitoring systems. More expensive but essential for serious off-grid travel.
~$190
Smart Monitoring Systems
Advanced systems like Compound Pro ~$450 track water usage rates and predict how long your supply will last based on current consumption.
Filtration and Water Quality
Tank water quality depends on your source water and how long it sits in the tank. Filtration protects against both contamination and taste issues.
Inline Filters
Basic carbon filters remove chlorine taste and some contaminants. Install between the tank and pump for whole-system filtering, or at individual taps for drinking water only.
Multi-Stage Systems
Combine sediment, carbon, and ceramic filters for comprehensive water treatment. Essential if you’re filling from questionable sources like rural bores.
~$280
UV Sterilisation
UV systems kill bacteria and viruses without chemicals. Requires 12V power but provides hospital-grade water sterilisation for dodgy water sources.
Never drink untreated water from unknown sources. Bore water, creek water, and even some town supplies can contain harmful bacteria or chemicals.
Grey Water Tanks
Grey water from sinks and showers must be contained in many camping areas. Tank size and placement affects your off-grid capacity.
Capacity Planning
Grey water production roughly equals fresh water usage minus drinking water consumption. Plan for 60-80% of your fresh water tank capacity.
Tank Types
Grey water tanks don’t need food-grade materials but should include proper venting to prevent odours. Drain valves must be accessible for regular emptying.
~$220
Grey Water Treatment
Biodegradable detergents reduce environmental impact. Grease trap systems prevent fat buildup that clogs tanks and drainage systems.
Filling Systems and Connections
Easy tank filling saves time and prevents contamination. Plan for both pressurised filling and gravity filling options.
Standard Connections
Most caravans use standard garden hose connections for water filling. Include a non-return valve to prevent back-contamination from the tank.
Fast-Fill Systems
Large diameter filling connections speed up tank filling from water carriers or fast-flow town supplies. Particularly useful for big tanks over 200 litres.
~$85
Gravity Filling
Deck fill systems allow filling from jerry cans or water carriers. Essential backup when pressurised supplies aren’t available.
| System Type | Best For | Typical Cost | Key Benefit |
|---|---|---|---|
| Large Polyethylene Tank + Variable Speed Pump Most Practical | Extended off-grid travel | $800-1200 | Best capacity/cost balance |
| Multiple Small Tanks + Standard Pump | Weight-sensitive setups | $600-900 | Better weight distribution |
| Stainless Steel + Premium Pump | High-end builds | $1800-2500 | Maximum durability |
| Standard Tank + Demand Pump | Caravan park travel | $400-600 | Simple and reliable |
Our Setup Recommendations
Choose your water system based on how you actually travel, not aspirational goals. Here’s what works for different travelling styles:
Caravan Park Hoppers
Stick with the standard 100-120L tank and basic demand pump. Add a simple filter for chlorine taste and you’re set. No point carrying extra water weight you won’t use.
Mixed Park and Free Camping
Upgrade to 200-250L capacity with a variable speed pump and digital monitoring. This gives 2-3 days autonomy between fillups without excessive weight.
Serious Off-Grid Travellers
Go for 300-400L fresh water capacity, premium pumps with accumulators, multi-stage filtration, and comprehensive monitoring. The extra complexity pays off when you’re days from services.
Start with a modest upgrade and add capacity later. You can always add portable tanks or upgrade pumps, but oversized systems add weight and complexity you might not need.
Budget Conscious Setup
A 200L polyethylene tank, standard demand pump, and basic inline filter covers most needs for under $500. Add monitoring and filtration upgrades over time.
- Plan water capacity for 3-5 days autonomy based on your actual usage patterns
- Polyethylene tanks offer the best value for most caravanners, with stainless steel worth considering for premium builds
- Variable speed pumps eliminate noise and pressure issues but cost twice as much as standard demand pumps
- Digital monitoring prevents running dry and helps track consumption patterns
- Under-floor tank mounting keeps weight low but requires flexible mounting systems
- Multi-stage filtration is essential if filling from questionable sources
- Match your system complexity to your actual travel style, not wishful thinking
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