If you’re comparing the Dometic 320 and 310 toilets for your RV or boat, you likely care about comfort, space, and flushing performance.
I’ve installed both in different rigs and lived with them daily.
In this review, I’ll walk you through a direct comparison, real-life pros and cons, maintenance insights, and which model suits your needs best.
By the end, you’ll feel confident choosing the right Dometic model for your mobile home.
Feature Comparison Table: Dometic 320 Vs. 310
| Feature | Dometic 320 | Dometic 310 |
| Rim Height | 20 inches (comfort height) | 15.5–17 inches (standard height) |
| Footprint | Slightly bulkier | More compact |
| Flush Operation | Foot pedal pump and water flow | Push-button on tank |
| Water Usage | Adjustable flush volume | Fixed standard flush |
| Bowl Material | Ceramic | Porcelain or plastic |
| Installation Floor Space | Requires more clearance | Fits tighter corners |
| Build Rating | Heavy-duty base, higher weight | Lightweight base, easier for compact spaces |
| User Comfort | Tall, more ergonomic | Lower seat, potentially uncomfortable |
| Price | Higher due to added features | Budget-friendlier |
My Real-World Experience with Dometic 320 and 310
When I first installed the Dometic 320 in my camper conversion, the taller seat immediately felt more comfortable—and it made standing up easier after a long hike.
Installation was straightforward, though it took a bit more floor space.
The foot-pedal flush left me feeling confident the whole waste would go down in one cycle.
I appreciated being able to adjust water volume depending on how hard I pumped.
Later, I installed a Dometic 310 in my teardrop camper where space is at a premium.
The compact footprint was ideal and the push-button flush simplified the tank setup. It felt solid, but shorter users appreciated the lower design.
Flushing worked well, though it sometimes required a second cycle with bulkier output.
That slight inconvenience was offset by the space saved under the sink and around the floor area.
Overall, for longer trips and everyday comfort, the 320 won my preference.
But for tight spaces and simple installs, the 310 delivered reliably—especially where storage and clearance matter.
Pros and Cons of Dometic 320 and 310
Pros:
- Dometic 320: Comfort height is ergonomic and ideal for taller people. Adjustable flush volume gives you control over water use. The foot-pedal avoids messing with handles or buttons. The ceramic bowl and stainless anchoring plate feel solid and high quality. Great for longer stays or larger campers.
- Dometic 310: Space-efficient design fits compact bathrooms well. Push-button flush is simple to access and maintain. Easier, lighter base makes for easier mounting and handling. Affordable price point compared to 320. Reliable performance in smaller setups with limited water tank capacity.
Cons:
- Dometic 320: Taller height and wider base require more floor space. Heavier to install. Flush mechanism is more complex and may wear faster if over-pumped. Higher cost than 310.
- Dometic 310: Lower seating may feel cramped if you’re tall. Fixed flush volume means sometimes you need a second flush for solid waste. Plastic bowl or lighter porcelain may feel less premium. May leave residue behind if not scrubbed periodically.
Maintenance & Troubleshooting Tips
Clean seals and gaskets regularly to avoid odors or leaks.
Use soft scrub brushes to clean rim and bowl; hard mineral buildup can reduce flush strength.
Lubricate the pedal or button mechanism with RV-safe silicone lube periodically.
Inspect the pump diaphragm on the 320 annually—replace if you notice reduced flush power or slow response.
Ensure the flush water supply line is clear and free of kinks or blockages.
Empty the holding tank promptly; a full tank increases back pressure and slows flush.
Check anchor bolts after rough roads; retighten if wobble or misalignment occurs.
Use non-abrasive cleaners to protect bowl glaze or finish.
Flush fresh water through the system occasionally to dilute lingering waste.
If flush weakens, check for clogged spray nozzles under the rim and scrub clean.
Also Read: My Thoughts On BioLet Composting Toilet
Additional Comparisons with Other Brands
- Dometic 320 Vs. Thetford Aqua-Magic Style
Thetford’s Aqua-Magic Style is a common alternative to the Dometic 320, especially if you’re shopping on a tighter budget.
It’s lighter in weight and made primarily of plastic, which makes it easier to install in smaller RVs or trailers.
The flush on the Aqua-Magic is a single-pedal operation, but in my experience, it doesn’t offer the same thorough bowl rinse or water control that the 320 gives.
The Dometic 320’s ceramic bowl feels sturdier and doesn’t retain odor or staining the way the Aqua-Magic sometimes does.
Another key difference is the height. The Aqua-Magic sits lower, which could be an issue for taller users or anyone with knee or back concerns.
While Thetford wins on price and portability, the 320 excels in comfort, performance, and long-term durability.
If you want a toilet that feels more like home and less like a camping compromise, the Dometic 320 comes out ahead.
- Dometic 310 Vs. Thetford 365
The Thetford Porta Potti 365 is a standalone, portable toilet often used in compact vans or temporary setups.
It’s not permanently installed like the Dometic 310, which makes it convenient for some users—but it comes with limitations.
There’s no plumbing hookup, so you’re dealing with a separate freshwater tank and a waste cassette you’ll need to dump manually.
Compared to that, the Dometic 310 is a real RV toilet, designed to hook into your water and black tank system. It flushes more powerfully, feels more stable when in use, and doesn’t require carrying a sloshing waste tank around.
The 365 is great if you need mobility or want to avoid installation work.
But for a true RV experience with flush-and-forget convenience, the 310 offers more comfort, better odor control, and less maintenance hassle over time.
- Dometic 320 Vs. Cassette Porta-Potti Models
Cassette toilets are often praised for their convenience in small campers, especially European-style vans.
They work well in very limited spaces and let you remove the waste tank from the outside for emptying.
However, after using cassette systems in two different setups, I can confidently say they don’t match the comfort or flush quality of a Dometic 320.
The 320 has a full-size bowl, adjustable flush water volume, and a more hygienic overall experience. In contrast, cassette models have smaller bowls, rely on chemical treatments, and need to be emptied every few days.
They do save on installation complexity, but that comes at the cost of convenience and comfort.
If your rig has the space and you value a more traditional toilet experience, the 320 is far superior—especially for extended trips or full-time RVers.
- Dometic 310 Vs. Bloomingville Portable Replacement Toilets
Bloomingville or generic portable toilets often come with simple designs, plastic construction, and a low upfront price.
These are popular among tent campers, overlanders, or those in ultra-light setups.
But when I tested one against my Dometic 310, the difference was night and day.
The Bloomingville model lacked flush strength and had a very shallow bowl that splashed easily and needed constant cleaning.
On the other hand, the 310 felt stable, more powerful in its flush, and easier to maintain.
Its foot-pedal mechanism meant I didn’t need to touch anything with my hands, which felt more hygienic, especially when boondocking.
If you only need a toilet for a weekend or have no space at all, a portable toilet will get the job done.
But if you’re traveling more regularly, the Dometic 310 pays for itself in both comfort and peace of mind.
- Dometic 320 Vs. RV Warehouse Elite Round Bowl
The RV Warehouse Elite Round Bowl is another fixed-install RV toilet often found in older rigs or as a budget aftermarket replacement.
It has a compact design, which makes it viable for smaller bathrooms, but in testing, it didn’t come close to the Dometic 320 in either comfort or flushing efficiency.
The round bowl feels cramped, especially for men or taller folks, and the plastic seat wobbles under pressure.
By contrast, the Dometic 320 features a residential-style elongated bowl that offers much more space and comfort.
The flush is also noticeably better—less likely to leave behind waste or tissue, which cuts down on bowl cleaning.
While the Elite Round Bowl might cost less, the extra few dollars you spend on the Dometic 320 are well worth it for the improved durability, easier maintenance, and sheer comfort it brings on the road.
Also Read: My Thoughts On EPLO Smart Toilet
Frequently Asked Questions (FAQs)
Thetford Aqua-Magic Style or Cassette systems are common alternatives—better for smaller spaces or chemical-based toilets.
Its seat height sits around 15.5 to 17 inches, shorter than the comfort-height 320 model.
A compact, foot- or button-flush RV toilet designed to minimize floor space while offering dependable gravity-based flush.
No. Both are major RV toilet brands, but they operate independently and have different product lines and design philosophies.
Final Thoughts
When choosing between the Dometic 320 and 310 toilets, ask yourself: do you want comfort and powerful adjustable flushing, or do you need tight space fit and simplicity?
If space allows, the 320 gives you really solid performance and better ergonomics for taller users or long-term travel.
If you want a reliable, compact toilet that installs easily and saves space, the 310 is a great option.
You and your setup both deserve a toilet that fits—not just physically, but in power, comfort, and ease of use.