Water is your most precious resource on the road. Get it wrong and you’re either lugging unnecessary weight, running dangerously low, or dealing with contaminated drinking water that ruins your trip.
The challenge? Every caravan setup is different, and the water system that works perfectly for weekend warriors might leave Big Lappers high and dry in the middle of nowhere. You need to understand your options before you commit to a system that’ll serve you for years.
This guide breaks down everything from tank materials and pump systems to filtration and monitoring gear. By the end, you’ll know exactly what setup matches your travel style and budget.
How Much Water Do You Actually Need?
The magic number isn’t what fits under your caravan. It’s how long you need to stay self-sufficient between refills.
A family of four uses roughly 80-120 litres per day when living normally in a caravan. That includes drinking water (8 litres), cooking and cleaning dishes (25 litres), showers (40 litres), and general washing (20 litres). Solo travellers typically use 30-50 litres daily.
Your travel style dictates your capacity needs:
- Caravan park hoppers: 100-150 litres works fine since you refill every few days
- Mixed on-road/free camping: 200-300 litres gives you 3-4 days independence
- Serious remote travel: 400+ litres for week-long dry camps
Every 100 litres of water adds 100kg to your payload. Factor this into your caravan’s ATM calculations before sizing up.
Don’t forget you need two systems: fresh water storage and grey water collection. Your grey water tank should be at least 70% of your fresh water capacity, since most water you use (except drinking) ends up as grey water.
Tank Materials: Poly vs Stainless Steel
Your tank material affects taste, durability, weight, and price. Here’s what actually matters.
Polyethylene (Poly) Tanks
Food-grade polyethylene dominates the caravan market for good reason. Modern poly tanks are UV-stabilised, impact-resistant, and won’t rust or corrode. They’re also significantly lighter than stainless steel.
The main downside? They can absorb odours and flavours over time, especially if you don’t maintain them properly. Quality varies dramatically between manufacturers.
~$400-800
Stainless Steel Tanks
Stainless steel tanks are the premium option. They don’t absorb flavours, handle temperature extremes better, and last decades with minimal maintenance. The trade-off is weight and cost.
A 300-litre stainless tank weighs roughly 40kg more than an equivalent poly tank and costs 2-3 times as much. For serious remote travellers who prioritise water quality and system longevity, it’s often worth it.
Fibreglass Tanks
Less common but worth considering for custom installations. Fibreglass tanks can be shaped to fit awkward spaces and won’t corrode. They’re heavier than poly but lighter than stainless steel.
Water Pump Systems Explained
Your water pump determines pressure, flow rate, and how quiet your system runs. Choose poorly and you’ll deal with weak showers, noisy operation, or constant cycling.
12V Diaphragm Pumps
The standard choice for most caravans. Diaphragm pumps are self-priming, handle air bubbles well, and provide steady pressure. They’re also repairable in the field if something goes wrong.
Look for pumps rated at 11-17 litres per minute with automatic pressure switching. The Shurflo 4008 series ~$180-220 is the industry standard, while the Seaflo 42-series ~$120-160 offers similar performance at a lower price point.
Accumulator Tanks
An accumulator tank reduces pump cycling and provides more consistent pressure. It’s essentially a small pressure vessel that stores water under pressure, so your pump doesn’t start every time you crack a tap.
~$85-110
Variable Speed Pumps
Premium option that adjusts speed based on demand. Variable speed pumps run quieter, use less power, and provide more consistent pressure than standard diaphragm pumps. They’re also more expensive and complex.
Mount your pump as close to the tank as possible to reduce priming issues. Insulate it with foam if noise is a concern.
Water Filtration and Purification
Australian town water is generally safe, but taste and quality vary dramatically. Tank water can also develop problems during storage. Your filtration system protects both your health and your coffee.
Inline Filters
The simplest approach. An inline filter connects directly to your water inlet, filtering all water as it enters your tank. Basic carbon filters improve taste and remove chlorine, while more sophisticated systems handle sediment and bacteria.
The downside? You’re filtering water you might use for dishwashing or showering, which shortens filter life unnecessarily.
Point-of-Use Filters
These filter water at specific taps, typically just your drinking water outlets. More efficient than inline systems since you’re only filtering what you consume, but requires multiple filter housings.
~$220-280
UV Sterilisation
For travellers who source water from dubious supplies, UV sterilisation kills bacteria and viruses without chemicals. UV systems require 12V power and work best combined with sediment filtration.
Water Purification Tablets
Emergency backup option. Purification tablets can treat sketchy water sources when your primary filtration isn’t enough. Keep a bottle of Aquatabs ~$15 in your emergency kit.
Tank Monitoring and Gauges
Running out of water is a serious problem. Running out unexpectedly is a disaster. Reliable tank monitoring prevents both.
External Level Indicators
Simple, reliable, and cheap. External indicators mount on your tank and show approximate levels through coloured sections. No electronics to fail, but accuracy is limited.
Electronic Gauge Systems
More sophisticated monitoring using sensors in your tank connected to a display panel. Most systems show both fresh and grey water levels, often with LED or digital displays.
~$450-550
Smartphone-Connected Systems
The latest generation uses Bluetooth or WiFi to send tank levels to your phone. Convenient for checking levels without walking outside, but adds complexity and potential failure points.
Plumbing Components That Matter
Good plumbing components work invisibly. Cheap ones fail at the worst possible moments and flood your caravan.
Fittings and Connections
Quality fittings cost more upfront but prevent expensive water damage later. Look for brass or high-grade plastic fittings with proper O-ring seals. Avoid barbed fittings where possible – they’re more likely to leak over time.
John Guest push-fit fittings are the gold standard for caravan plumbing. They connect and disconnect easily without tools, making maintenance simpler.
Hoses and Pipes
Use proper food-grade water hose inside your caravan, not cheap garden hose that can leach chemicals. For external connections, reinforced drinking water hose handles the pressure and UV exposure.
Install a pressure limiting valve at your water inlet. Many caravan park taps exceed 60 PSI, which can damage your internal plumbing.
Valves and Taps
Ball valves are more reliable than cheaper gate valves for isolation and drainage. Microswitch taps can fail, so keep manual backup taps for essential functions like your kitchen sink.
Keeping Your System Clean
Water system maintenance prevents taste problems, bacterial growth, and expensive repairs. The key is staying ahead of problems rather than reacting to them.
Regular Sanitisation
Sanitise your water system every 3-4 months or when you notice taste changes. Use unscented household bleach (1 tablespoon per 40 litres of tank capacity), fill the system, let it sit for several hours, then flush thoroughly.
Some prefer food-grade hydrogen peroxide for sanitisation since it doesn’t leave chlorine residues.
Tank Flushing
Empty and refill your fresh water tank regularly, especially in hot weather. Stagnant water develops bacteria and algae growth. If you’re staying put for more than a week, drain and refill rather than topping up.
Filter Replacement
Replace water filters based on litres processed, not just time. A busy family might go through a 6-month filter in 6 weeks. Keep spare filter cartridges and replace before taste deteriorates.
Never leave water in your tanks when temperatures drop below freezing. Frozen water can crack tanks and burst pipes, causing thousands of dollars in damage.
Our Recommendations by Travel Style
Here’s how to match your water system to your actual travel patterns.
Weekend Warriors (Caravan Parks)
You refill regularly and rarely dry camp. Prioritise simplicity and cost over capacity.
- Tank capacity: 100-150 litres fresh, 80-100 litres grey
- Material: Quality poly tank
- Pump: Basic 12V diaphragm pump
- Filtration: Simple inline carbon filter
- Monitoring: External level indicators
Mixed Travellers (Some Free Camping)
You need independence for 3-4 days between refills. Balance capacity with weight and complexity.
- Tank capacity: 200-300 litres fresh, 150-200 litres grey
- Material: Heavy-duty poly or stainless steel
- Pump: Quality diaphragm pump with accumulator tank
- Filtration: Multi-stage inline system
- Monitoring: Electronic gauge system
Serious Remote Travellers
Water quality and system reliability matter more than cost. You need maximum capacity and backup options.
- Tank capacity: 400+ litres fresh, 300+ litres grey
- Material: Stainless steel preferred
- Pump: Variable speed pump or dual pump system
- Filtration: Multi-stage with UV sterilisation
- Monitoring: Advanced electronic system with smartphone connectivity
| Travel Style | Tank Size | System Cost | Key Priority |
|---|---|---|---|
| Weekend Warriors | 100-150L | $800-1,500 | Simplicity |
| Mixed Travellers Most Common | 200-300L | $1,500-3,000 | Balance |
| Remote Specialists | 400L+ | $3,000-6,000 | Reliability |
- Size your water system to match your actual camping style, not theoretical maximums
- Quality components cost more upfront but prevent expensive failures on the road
- Plan for both fresh water storage and grey water collection in your capacity calculations
- Regular maintenance prevents most water system problems before they start
- Weight matters – every 100 litres of water adds 100kg to your payload
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