Porta Potti vs Dometic: 4 Portable Toilets for a Van
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The porta potti vs dometic decision gets practical when you check where a toilet could fit inside your van. A taller seat affects how you sit, while a smaller waste tank affects how often you need to empty it. Start with space and emptying, then choose your flush system.
Quick answer
Checked on 19 October 2026. For a van with room for a taller toilet, choose the Thetford 365 for its larger fresh tank or the Dometic 976 for its hand-pressurised, push-button flush. For a lower space, consider the Thetford 345 or Dometic 972, accepting more frequent emptying with their smaller waste tanks.
All 4 picks at a glance
Thetford Porta Potti 365
A hold-down kit is available if you need to secure it in the van. Read more
Thetford Porta Potti 345
A rotating pour-out spout and sealed valve help with the emptying routine. Read more
Dometic 976 Portable Toilet
Mounting brackets are sold separately for securing it in place. Read more
Dometic 972 Portable Toilet
Its tank level indicator helps you keep track of when to empty it. Read more
How we compared them
The NomadsToolsLab team read the manufacturers' product pages, brochures and manuals and checked each Amazon US listing with a US address on 19 October 2026. The comparison covered tank sizes, flush systems, seat height and weight. The larger pair holds similar amounts of waste, but the Thetford carries more flush water.
Piston pump or air pump, and where to empty the tank
The Thetford models use a piston pump and a larger fresh water tank. Dometic uses a hand air pump to pressurise its smaller flush tank, followed by a push-button flush. Neither system needs batteries.
Use a suitable disposal point permitted by the site and local rules, following the toilet and treatment-product instructions. Plan around a suitable disposal point when choosing your waste tank size.
Porta Potti vs Dometic side by side
| Toilet | Waste tank | Flush water | Height (maker)Weight (maker) | |
|---|---|---|---|---|
| Porta Potti 365 | Waste tank: 21 L (5.5 gal) | Flush water: 15 L, piston pump | Height (maker): 16.06 in | Weight (maker): 4.0 kg |
| Porta Potti 345 | Waste tank: 12 L (3.2 gal) | Flush water: 15 L, piston pump | Height (maker): 12.75 in | Weight (maker): 3.8 kg |
| Dometic 976 | Waste tank: 18.9 L (5.0 gal) | Flush water: 8.7 L, hand air pump | Height (maker): 15.25 in high | Weight (maker): 14 lb (6.35 kg) |
| Dometic 972 | Waste tank: 9.8 L (2.6 gal) | Flush water: 8.7 L, hand air pump | Height (maker): 12.5 in high | Weight (maker): 12 lb |
Figures from the makers' pages, brochures and the Thetford 2025 catalogue, read on 19 October 2026: Porta Potti 365, Porta Potti 345, Dometic 976 and Dometic 972.
Thetford Porta Potti 365: a taller seat with more waste capacity
Thetford Porta Potti 365
Pick the Thetford Porta Potti 365 if you want a taller seat and the largest waste tank here, because it gives you more holding capacity, but waste fills first. Use the waste indicator to decide when to empty the tank; remaining flush water does not mean there is room for more waste.
Thetford's general guidance gives roughly 27 to 33 flushes before the waste indicator shows full, depending on model. Do not treat that as a model-specific capacity for the 365. Use the waste indicator to plan emptying rather than waiting for the flush water to run out.
Thetford Porta Potti 345: a lower seat with the same flush approach
Thetford Porta Potti 345
Pick the Thetford Porta Potti 345 if a lower toilet suits your van, because it keeps the piston-pump system in a shorter model, but you accept a lower seat and more frequent emptying. The smaller waste tank is the trade-off for this choice.
Its fresh tank matches the larger Thetford model, so the lower body does not mean less flush water. The waste level indicator tells you when the holding tank needs attention.
Dometic 976: a taller toilet with a pressurised flush
Dometic 976 Portable Toilet
Pick the Dometic 976 if you want a taller toilet with push-button flushing, because hand pumping pressurises the flush tank, but full-tank handling matters. Practical Sailor found the full holding tank heavy.
Practical Sailor also found the level indicator hard to read while standing. That is worth considering if you expect to check the tank with a quick glance from above.
Dometic 972: a lower toilet with a smaller holding tank
Dometic 972 Portable Toilet
Pick the Dometic 972 if you need a low toilet and prefer push-button flushing, because it offers that flush system in the shorter Dometic model, but it has the smallest waste tank here. Plan for more frequent emptying than with the larger models.
Its flush tank matches the larger Dometic model. Choosing the lower version reduces waste capacity without reducing the listed flush-water capacity.
Choose the height first, then the tank and flush system
Start with the space available and the seating position you can use. The taller pair gives you larger waste tanks, while the lower pair trades capacity for a shorter toilet.
Then decide whether you prefer a piston pump or a hand-pressurised push-button flush. Keep emptying access in mind, because extra fresh water does not create extra waste capacity. Building out the rest of the van? Our portable shower guide and cargo van conversion for beginners cover more.
- The Thetford 365 has the largest waste tank, but it needs emptying before its fresh water runs out.
- The Thetford 345 keeps the larger fresh tank in a lower model, with less waste capacity.
- The Dometic 976 offers a taller push-button option, with handling and indicator limitations reported by Practical Sailor.
- The Dometic 972 offers a lower push-button option, with the smallest waste tank of these four.
Watch: Porta Potti and Dometic up close
For a video focused on the Thetford Porta Potti, see We're the Russos' “Portable Toilet Review - Thetford Porta Potti for Van Life, Truck Camper Life” from 2020.
Video by We're the Russos.
See the Porta Potti 365 on Amazon.
For a video focused on the larger Dometic model, see Product Reviews' “Dometic SaniPottie 970 Portable Toilet Model 976 Review 2023”.
Video by Product Reviews.
See the Dometic 976 on Amazon.
FAQ
What is the main flush difference between Porta Potti and Dometic?
The Thetford models use a piston pump. The Dometic models use a hand air pump to pressurise the flush tank, then a push button to flush. Neither needs batteries.
Which models have the lower seat?
The Thetford 345 and Dometic 972 are the lower pair. Their listed heights are 12.75 inches and 12.5 inches respectively.
Does the Thetford 365 run out of flush water before its waste tank fills?
No. The maker's figures put the waste indicator at full before the fresh water runs out. Remaining flush water is not a reason to delay emptying.
Where can you empty these portable toilets?
Use a suitable disposal point permitted by the site and local rules, following the toilet and treatment-product instructions. Plan access to one before the waste tank fills.
Affiliate disclosure. This post contains affiliate links. If you click and buy something, this site earns a small commission at no extra cost to you. Picks are based on published specs, independent tests and manufacturer information. As an Amazon Associate I earn from qualifying purchases. Read the full affiliate disclosure. Amazon and the Amazon logo are trademarks of Amazon.com, Inc. or its affiliates.
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