Compare Thetford Porta Potti Toilets
The Complete Thetford Portable Toilet Range
If you’ve ever found yourself confused by all the different Thetford portable toilet models, you’re definitely not alone. I’ve been there too.
Between the similar model names, varying tank sizes, flushing systems, seat heights and design updates, it’s easy to lose track of which Thetford Porta Potti is which.
I have put together a simple comparison table below, showing all the main Thetford Porta Potti toilet models side by side, so you can quickly see the differences in features, size and capacity and find the one that best suits your setup and travel style.
If you are looking for separation toilets and you want a full breakdown of how the system works, the different models available and what to expect during installation, take a look at our dedicated Thetford separation toilet page. It covers the range in detail and is a useful starting point if you’re deciding which version will fit your layout.
Porta Potti Range Overview
Let’s take a quick look at each series (100, 300 & 500) to see what the key differences are between them.
The 100 Series, models 145 and 165, are the simpler, more budget-friendly options. They come in two heights, 330mm and 414mm, and use a bellows pump and come without a waste level indicator.
The 300 Series, models 335, 345 and 365, offer a few upgrades, including a piston pump and a built-in waste level indicator, making them slightly higher in price but more convenient to use. The 335 model is super small at just 308mm in height and is the most compact toilet on offer in the Thetford portable range.
The 500 Series is Thetford’s luxury portable toilet, models 565P and 565E, and takes portable comfort a step further, providing extra height offering a more home-like experience. The 565P features a piston pump, while the 565E adds the convenience of an electric flush. Each model includes built-in level indicators for both waste and flush tanks, along with an integrated toilet roll holder.
To view more information on the different pump types jump to the Q & A section at the bottom of the page Difference between BELLOWS, PISTON and ELECTRIC
While each Porta Potti shares Thetford’s reliable build quality, the main differences come down to size, comfort and convenience. The higher the series number, the more user-friendly features you’ll get, from easier flushing systems to built-in waste indicators and more comfortable seat heights. This tiered design helps you pick a toilet that fits your camping setup, vehicle size and how often you plan to use it.
All Porta Potti models are made from durable, high-quality plastic that resists odours and staining. Waste tank capacities range from about 10 to 21 litres, depending on the model, while flush water tanks range between 10 and 15 litres.
The table below lists all models in Thetford’s 100, 300 & 500 Series portable toilets side by side for comparison purposes.
Porta Potti 100 vs 300 vs 500 Quick comparison
| Feature | Porta Potti 100 Series | Porta Potti 300 Series | Porta Potti 500 Series |
|---|---|---|---|
| Flush type | Bellows pump | Piston pump | Electric or piston pump |
| Comfort / seat height | Medium or High | Low, Medium or High | Extra High |
| Tank capacity | Cheapest (reduced features) | Most Popular | Luxury (higher seat position) |
| Waste Level indicator | No | Yes | Yes |
| Flush Level indicator | No | No | Yes |
| Ease of emptying | Standard spout | Standard spout | Standard spout |
| Recommended use | Occasional campers, weekend trips | Regular campers, campervans | Caravans, motorhomes, long trips |
| Typical pros | Lowest cost | Most portable, waste indicator | Most comfortable, waste & flush indicator |
| Typical cons | Basic bellows pump, No waste or flush indicator | No flush indicator | Heavier, higher price |
Note: features may vary by specific model—use this table as a general guide and check product listings for exact specs.
Porta Potti 100, 300 & 500 Models Specification Table
| Model | Size | H x W x D (mm) | Seat Height | Pump Type | Waste Tank | Waste Tank Indicator | Flush Tank Indicator | Kg | |
|---|---|---|---|---|---|---|---|---|---|
| 335 | S | 313 x 342 x 382 | 308mm | Piston | 10L | Yes | No | 3.3 | |
| 145 | M | 330 x 383 x 427 | 324mm | Bellow | 12L | No | No | 3.6 | |
| 345 | M | 330 x 383 x 427 | 324mm | Piston | 12L | Yes | No | 3.8 | |
| 165 | L | 414 x 383 x 427 | 408mm | Bellow | 21L | No | No | 3.8 | |
| 365 | L | 414 x 383 x 427 | 408mm | Piston | 21L | Yes | No | 4.0 | |
| 565P | XL | 448 x 388 x 450 | 443mm | Piston | 21L | Yes | Yes | 4.9 | |
| 565E | XL | 448 x 388 x 450 | 443mm | Electric | 21L | Yes | Yes | 5.0 | |
Notes:
- The flush water tank capacity for all models is 15L, except for the 335 at 10L.
- The maximum load in terms of a person’s weight is 120Kg for all models.
Porta Potti Toilet Models
Porta Potti 335
| Size | Small |
| Dimensions | H313 x W342 x D382 (mm) |
| Seat Height | 308mm |
| Pump Type | Piston |
| Waste Tank | 10L |
| Waste Indicator | Yes |
| Flush Indicator | No |
| Weight | 3.3Kg |
Porta Potti 145
| Size | Medium |
| Dimensions | H330 x W383 x D427 (mm) |
| Seat Height | 324mm |
| Pump Type | Bellow |
| Waste Tank | 12L |
| Waste Indicator | No |
| Flush Indicator | No |
| Weight | 3.6Kg |
Porta Potti 345
| Size | Medium |
| Dimensions | H330 x W383 x D427 (mm) |
| Seat Height | 324mm |
| Pump Type | Piston |
| Waste Tank | 12L |
| Waste Indicator | Yes |
| Flush Indicator | No |
| Weight | 3.8Kg |
Porta Potti 165
| Size | Large |
| Dimensions | H414x W383 x D427 (mm) |
| Seat Height | 408mm |
| Pump Type | Bellow |
| Waste Tank | 21L |
| Waste Indicator | No |
| Flush Indicator | No |
| Weight | 3.8Kg |
Porta Potti 365
| Size | Large |
| Dimensions | H414x W383 x D427 (mm) |
| Seat Height | 408mm |
| Pump Type | Piston |
| Waste Tank | 21L |
| Waste Indicator | Yes |
| Flush Indicator | No |
| Weight | 4Kg |
Porta Potti 565
| Size | Extra Large |
| Dimensions | H414x W383 x D427 (mm) |
| Seat Height | 408mm |
| Pump Type | P: Piston, E: Electric |
| Waste Tank | 21L |
| Waste Indicator | Yes |
| Flush Indicator | Yes |
| Weight | 4Kg |
Porta Potti Must Have Accessories
Carry Bag Small
| Size | Small |
| SKU | 299902 |
| Fits Models | 145, 335, 345 |
| Washable | 40 Degrees C |
Carry Bag Large
| Size | Large |
| SKU | 299901 |
| Fits Models | 165, 365, 565 |
| Washable | 40 Degrees C |
Toilet Fluid Duo
| Aqua Kem Blue, Aqua Rinse Pink | |
| Size | Blue: 780ml, Pink: 750ml |
| Tank | Blue: Waste, Pink: Flush |
| Dose | Blue: 60ml, Pink: 50ml |
Hold Down Kit S
| Option | Hold Down Kit |
| Fits Models | 335 |
| SKU | 92921111 |
Note: No link to product currently, as stock levels change so quickly and become out of stock.
Hold Down Kit L
| Option | Hold Down Kit |
| Fits Models | 165 & 365 |
| SKU | 92922111 |
Note: No link to product currently, as stock levels change so quickly and become out of stock.
Floor Plate XL
| Option | Floorplate |
| Fits Models | 565P & 565E |
| SKU | 9241507 |
Note: No link to product currently, as stock levels change so quickly and become out of stock.
Questions & Answers
Now that you’ve seen how each series compares, let’s go over some of the most common questions about using and maintaining Thetford Porta Potti toilets.
What Is A Porta Potti Toilet?
Whether you’re camping off-grid, staying on a busy campsite, or travelling in your campervan, a Thetford portable toilet provides the perfect blend of comfort, hygiene and freedom.
Designed for use in tents, awnings, caravans, campervans and boats, these self-contained toilets offer the same level of convenience you’d expect from your bathroom at home without needing a connection to a water line, drain or sewer.
Thetford’s Porta Potti range is lightweight, compact and completely mobile, making it ideal for any situation where a regular toilet isn’t available. Each model is designed for easy use, simple emptying and hygienic waste disposal, ensuring a fresh and odour-free experience every time.
Beyond camping, Thetford portable toilets are also useful at home, for example, during renovations, for potty training, or for elderly care when easy access and reliability matter most. Their versatile design, durable build and portable size make them a trusted choice for thousands of campers and travellers worldwide.
In the guide below, we’ll compare all Thetford Porta Potti models, highlighting key differences in size, capacity, comfort features and portability so you can find the best model for your next adventure.
How should I clean and maintain my Thetford Porta Potti?
A Thetford Porta Potti has two parts: a freshwater tank for flushing and a waste tank for storage.
For daily use, add Aqua Rinse Concentrated (the pink fluid) to the flush tank to prevent limescale, improve flushing, and keep it smelling fresh. In the waste tank, use Aqua Kem Blue to control odours, reduce gas build-up, and break down waste for easier emptying.
For deeper cleaning, use Duo Tank Cleaner two or three times a year to remove limescale and residue and keep your toilet in top condition.
What is the difference between the bellows, piston and electric flush systems on Thetford toilets?
Thetford portable toilets come with three main types of flushing systems: bellows, piston and electric. The main difference lies in how each system delivers the flush and how much effort it takes to use.
Bellows Pump
This system uses a concertina-style tube that you press up and down to create pressure for flushing. It’s simple and reliable but can require a bit more effort, which may make it less convenient for young children or anyone with limited hand strength. You’ll find this type of pump on models like the Porta Potti 145 and 165.
Piston Pump
The piston system uses a single pull and push motion to draw water from the tank and flush it through the bowl. It delivers a stronger, more controlled flush with much less effort than the bellows type, making it a popular choice for most campers. The Porta Potti 345, 365 and 565P feature this mechanism.
Electric Pump
At the top of the range is the electric flush system, found on the Porta Potti 565E. This version uses a battery-powered pump that flushes water at the touch of a button. It’s effortless, clean and ideal for anyone who values maximum comfort and convenience, particularly useful for families, frequent campers or those who prefer a home-like experience on the road.
What are the Porta Potti Carry Bag dimensions?
The Thetford Porta Potti small carry bag is approx 43D x 43W x 33H cm
The Thetford Porta Potti large carry bag is approx 45D × 45W × 45H cm
Are Thetford Porta Pottis easy to clean?
Yes, all models feature a detachable waste tank with a secure pour-out spout to make emptying clean and straightforward.
Can I use any chemicals in Thetford toilets?
It’s best to use Thetford’s own Aqua Kem Blue (waste tank) and Aqua Rinse (flush tank) for best results and to protect seals.
Do the toilets need power?
Only the 500 Series requires batteries for the electric flush. The others use manual pumps.
How long does a Porta Potti last before emptying?
It depends on the model and number of users, but generally, the waste tank lasts 2–4 days for two people with regular use. Larger models like the 565 can go longer between empties thanks to their higher capacity.
Can I use a Porta Potti in cold weather?
Yes, though in freezing temperatures, add a small amount of non-toxic antifreeze (propylene glycol) to the waste tank to prevent freezing. Never use automotive antifreeze.
How should I dispose of the waste responsibly?
Always empty your Porta Potti at designated chemical disposal points found at campsites or service areas. Avoid emptying into regular toilets or natural areas to prevent contamination.
A non-chemical alternative option
A cheaper alternative to a chemical toilet is the more simply designed Carplife Bivvy Loo, which is not only portable but can be folded down to just 41 x 35 x 8 cm.
Easy to store and easy to use. It comes with compostable liner bags, sachets with absorbent gel and biodegradable wipes.
The liner bags simply fit inside the bivvy loo with the gel placed in the base to absorb any liquids.
To find out more, see our dedicated post on the Carplife Bivvy Loo
