A red-dirt camp beside the Diamantina is a poor place to discover your shower has drained the last of your fresh water. Water is one of the biggest differences between a quick weekend away and confident remote touring, which is why this guide to caravan water systems starts with the practical question: how long do you want to stay off-grid?
The answer shapes everything from tank capacity and payload to how you wash up, shower and refill. A well-designed caravan water system should feel simple when you are travelling - turn on a tap, run the shower, make a cuppa - but understanding what sits behind those comforts helps you use it wisely and spot trouble before it sidelines a trip.
Start with your touring style
There is no single ideal water capacity. Couples moving through caravan parks every few days can travel comfortably with less water than a family spending a week in national parks or on remote station stays. More water extends your freedom, but it also adds serious weight.
One litre of water weighs one kilogram. A caravan carrying 200 litres has 200kg added before you account for food, recovery gear, clothes and other essentials. That weight must sit within the van's payload and be considered alongside your tow vehicle's limits. Capacity matters, but tank placement, chassis design and sensible loading matter just as much on corrugated roads.
Before choosing a caravan or planning a long route, estimate daily use honestly. Drinking and cooking may only take a few litres per person, while showers, dishwashing and toilet use can quickly push consumption much higher. Travellers who are happy with short navy showers and a wash-up tub will stay out longer than those using water as if they were connected to town supply.
The main parts of a caravan water system
Fresh water tanks
Fresh water tanks store the potable water used at the kitchen tap, bathroom basin, shower and, in many layouts, toilet. Quality off-road caravans commonly use protected tanks mounted low and securely beneath the body, with guards designed to reduce exposure to stones and track damage.
Look beyond the headline litres. Ask whether tanks are protected, how they are mounted, whether they can be isolated, and how easily drains and fittings can be accessed for maintenance. Multiple tanks can offer flexibility, particularly if one needs to be drained or taken out of service. They can also help distribute weight, though the final effect depends on the caravan's engineering and load position.
Tank level monitors are useful, but treat them as a guide rather than gospel. Sensors can be affected by residue, movement and uneven ground. Check your water level regularly and learn what your normal usage looks like. A quick visual check during set-up is far better than assuming the display is perfectly accurate.
Water pump and plumbing
A 12V pressure pump moves water from the tanks to your taps. When it is operating correctly, it maintains pressure and cycles briefly when a tap is opened. If it runs repeatedly when every tap is closed, water may be escaping through a leak, a loose fitting, a partially open drain or a toilet valve.
Most pumps have a small filter or strainer near the inlet. This catches debris before it reaches the pump, but it needs occasional cleaning. If water flow drops, start with simple checks: confirm there is water in the selected tank, inspect the strainer, check fuses and battery charge, then look for kinked hoses or obvious leaks.
A pump should not be run dry for long. It can overheat or damage internal components. When a tank is empty, switch to a full tank if your van allows it, or turn the pump off until you refill.
Hot water service
A hot water service turns a basic camp into a far more comfortable base after a cold morning walk or a dusty day on the tracks. Depending on the caravan, hot water may be heated by gas, 240V power, engine heat or a combination of these sources.
Each option has trade-offs. Gas is well suited to independent camping but consumes LPG. Electric heating is handy at powered sites, while engine-assisted systems can make use of travel days. Whatever system you have, read the specific operating instructions before departure. Never run a hot water service without confirming it has water in it, and allow it to cool before servicing or draining.
Grey water and wastewater
Fresh water has to go somewhere once it has been used. Grey water is wastewater from sinks and showers. Rules vary between states, campsites and national parks, but discharging grey water onto the ground is often prohibited or unwelcome, especially in busy camping areas.
If your caravan has a grey water tank, use it where required and empty it only at approved dump points. If it does not, carry a suitable portable solution where regulations demand contained wastewater. Keeping camps clean is part of protecting the places that make off-grid touring worthwhile.
Filling safely: a habit worth keeping
Not every tap at a campground, roadhouse or public rest area is intended for drinking water. Fill only from clearly marked potable water outlets, and use a dedicated food-grade drinking-water hose. Keep that hose capped and stored separately from sewer gear, levelling equipment and anything that lives in the mud.
A few simple practices make a real difference:
- Flush a new or rarely used hose before filling your tanks.
- Use an inline sediment or drinking-water filter when the source quality is uncertain.
- Avoid placing hose ends on the ground or inside a drain opening.
- Keep fillers, caps and fittings clean, particularly after dusty tracks.
How to make water last off-grid
The easiest litre to carry is the one you do not waste. Small changes are more effective than elaborate gadgets when you are camped away from services.
Take short showers and wet down, turn the water off, soap up, then rinse. Wash dishes in a basin rather than under a running tap. Keep drinking water chilled in bottles so no one runs a tap waiting for it to cool. Use hand sanitiser for routine cleaning when appropriate, and reserve water for washing when it is genuinely needed.
It also pays to separate your priorities. Drinking, cooking and hygiene should come before washing vehicles, rinsing dusty gear or filling a pet bowl from an open tap. If you travel with pets, budget their water into your daily figure from the start.
Preparing your system before a big trip
A pre-trip water check is quick, and it can save a great deal of frustration. Fill tanks at home or at a trusted potable source, then run every tap, shower and toilet. Check underneath the caravan for drips, confirm the pump stops once pressure is reached, and test the hot water service according to its instructions.
Sanitise fresh water tanks and plumbing periodically, particularly after long storage, a repair or an unexplained change in taste or smell. Use a caravan-safe tank treatment exactly as directed, flush thoroughly, and do not mix cleaning chemicals. If water smells unusual after sanitising, keep flushing until it is clear and odour-free.
Cold weather brings another consideration. Water left in exposed lines can freeze in alpine conditions, while a van stored for months can develop stale tank water and perished seals. Draining and preparing the system for storage is not glamorous work, but it protects fittings, pumps and your first trip back on the road.
For travellers heading beyond the blacktop, choose a caravan built with the protection, capacity and serviceability your route demands. Australian-made off-road options from Cub Campers are designed around the realities of touring this country: rough roads, long distances between towns and the need for genuine self-sufficiency.
Water independence is not about carrying the largest possible tank. It is about knowing your capacity, respecting your payload, filling from safe sources and using every litre with purpose. Get those foundations right and a quiet bush camp feels less like roughing it and more like exactly where you planned to be.