Every caravan and RV toilet system is a trade-off between convenience, capacity and cost. There is no single right answer - a weekend tourer, a full-time traveller and an off-grid camper each end up with a different setup for good reason. This guide walks through the main options so you can work out which suits how you actually travel.
The Main Options
Almost every setup on the road falls into one of four categories: a removable cassette toilet, a fixed black water tank with a macerator or gravity outlet, a composting toilet, or a simple portable cassette-style unit. Each has a different relationship with dump points, which is worth understanding before you buy.
Cassette Toilets
The most common setup in Australian caravans. A sealed cassette slides out from an external hatch, and you carry it to the dump point to empty rather than connecting a hose. Thetford's C200, C250 and C400 series and Dometic's 972x models cover most of the market, differing mainly in cassette capacity and whether the toilet swivels for tight bathrooms.
Cassette toilets are inexpensive to buy and simple to repair - the parts that wear out (the rubber seal, the blade mechanism) are cheap and widely available. The trade-off is capacity: most cassettes hold 19-21 litres, so longer stints between dump points mean more frequent emptying. For the detail on keeping one running well, see our guide to maintaining and cleaning a toilet cassette.
Fixed Black Water Tanks
Common in larger motorhomes and fifth wheelers, a fixed tank sits under the floor and empties via a drain hose connected to the dump point inlet, sometimes assisted by a macerator pump (common on Dometic systems) that lets you use a narrower hose over a longer run. Capacity is usually much larger than a cassette - often 90 litres or more - so you empty less often.
The trade-off is that you cannot easily remove the tank to inspect or clean it, and a macerator is one more thing that can fail. For most standard caravans, a fixed tank and macerator adds cost without a clear benefit over a cassette; it makes more sense once you are into motorhome territory where a cassette's capacity would mean daily stops.
Composting Toilets
Composting toilets like the Nature's Head and Separett Villa separate liquid and solid waste. Liquids drain to a small diverter bottle that needs emptying regularly (a dump point is the right place for this); solids collect in a separate chamber with a cover material such as coconut coir, and are only emptied every few weeks depending on use.
The appeal is going longer between waste stops and never dealing with black water sloshing in a tank. The trade-off is a higher upfront cost, a learning curve around venting and cover material, and solid waste that needs proper disposal - never down a dump point. Our guide to travelling with a composting toilet covers the day-to-day routine in detail.
Porta-Pottis and Portable Toilets
A step down from a built-in cassette system, portable units like the Thetford Porta Potti Qube are self-contained and freestanding rather than plumbed into an external hatch. They suit camper trailers, tent-based setups, or as a backup in a caravan without a fixed toilet. Capacity is smaller again - typically 10-21 litres - and you empty the same way as a cassette, by carrying it to the inlet.
They are the cheapest entry point by a wide margin and need no installation, which is why they remain popular for occasional or budget setups even though they hold less and need emptying more often.
Which is Right for You?
Weekend and holiday travellers are usually well served by a standard cassette toilet - low cost, easy to maintain, and capacity is rarely an issue over a long weekend or a week away.
Full-time travellers and long remote trips benefit from either a larger fixed tank or a composting toilet, since both reduce how often you need to find a dump point. See our guide to planning water and waste for a big lap if this is you.
Motorhome and fifth-wheeler owners with the floor space for it are typically better off with a fixed tank and macerator, matching the larger fresh and grey water tanks these rigs usually carry.
Camper trailer and tent-based travellers are usually best served by a portable porta-potti - no installation, no hatch cutting, and enough capacity for the kind of shorter trips this style of travel suits.
Common Questions
Can I switch from a cassette toilet to a composting toilet?
Yes, in most caravans and camper trailers. Composting toilets like the Nature's Head or Separett take up a similar footprint to a cassette toilet housing, though you will need to plan for ventilation and a spot to store spare liquid containers and cover material.
Do composting toilets still need a dump point?
For liquids, yes - the urine diverter bottle still needs emptying somewhere appropriate, and a dump point is the correct place for it. Solids go into general waste once fully composted or bagged, not down a dump point.
How long does a cassette toilet last?
The cassette itself can last well over a decade with basic care. The parts that wear out first are the rubber seals and the blade or slider mechanism, both of which are cheap and straightforward to replace.
Are macerator toilets worth it for a caravan?
Macerator systems suit larger motorhomes with a fixed black water tank, where the pump lets you empty through a narrower hose over a longer distance. For a standard caravan with a removable cassette, a macerator adds cost and complexity without much benefit.
What is the cheapest option for occasional use?
A portable cassette-style toilet such as the Thetford Porta Potti is the lowest-cost entry point, and works in a tent, camper trailer or as a backup in a caravan without a fixed toilet.
Find a Dump Point
Whatever system you run, you will still need somewhere to empty it. Use the interactive map to find dump points near your current location, or see our guide to what to pack in your dump kit to make sure you have the right gear for your setup.