Dometic 300 vs 310 vs 320 vs 510 Dimensions (Will It Fit?)

One of the most important chairs in anyone’s life. The bathroom throne is essential and when you need to use it, you want to be comfortable. Plus, when you upgrade it to a newer model, you want to know if it will fit in the old throne’s place or if you need to keep looking for one that does.

Between the 300 and 310, it will be a very close fit as the dimensions are only .25 of an inch apart from each other. That means it may the two could be interchangeable as the 310 is the smaller of the two toilets.

To learn more about this topic, just continue to read our article. It provides those dimensions and a lot more information. Knowing the exact size of the different toilets lets you know if you need to renovate your bathroom and make it larger or leave it as is.

Will a Dometic 320 Fit Where a 300 Was?


If your 300 toilet is already up against the wall, then it is doubtful that the 320 can sit in its place. The difference is due to the measurement from the wall to the center of the pedestal.

The 300 has a measurement of 8.5 inches and the 320 has a wall-to-center measurement of 11 inches. That would make it difficult to set the 320 toilet over the floor toilet drain.

If the 300 toilet is placed a little ways away from the wall, then it may be possible to make the 320 fit. All you would need is to use the excess space to help center your new toilet over the floor toilet drain.

A good tape measure should help you answer this question for your specific toilet location.

Dometic 300 vs 310


If we are talking dimensions, then these two models are the closest in size among all the toilets listed in the title above. The actual dimensions that we have are:

The 300- is 19.25 x 15 x 20 inches and the 310 is- 19 x 15 x 20 inches. Even if the 300 is against the wall, the 310 should fit in the same spot. As you can see, it is the smaller of the two toilets so you may get a little more adjustment play to make sure it fits over that floor toilet drain.

The biggest difference between these two toilets will be their weight. The 300 weighs almost just above 7 pounds and the 310 weighs 23 1/2 pounds. That is something important to consider.

Dometic 320 vs 310

The 320 toilet is one of the larger models in this comparison. Its dimensions are- 27 x 20.5 x 25 inches and as you can see by the 310’s dimensions above, the 320 dwarfs the 310.

You may have to consider remodeling your bathroom if you want to upgrade to the 320. It is going to take up a lot more room. Plus, the 320 is 12.5 pounds heavier than the 310.

If you are at or near your weight capacity, this may be a problem for you. The similarity between all three toilets from Dometic is that they all come with a two-bolt installation. If the toilets are in the right place, they may all use the same bolt holes.

Dometic 320 vs 321


The 321 seems to be closer to the 320 than the 310 or 300 dimension-wise. Its dimensions are- 22 x 15 1/2 x 14 3/4 and the weight of this toilet is the same as the 320. You won’t have any weight issues with this exchange if you go this route.

Plus, you would need at least 11 inches of clearance from the wall to set this toilet properly in place. That would be about the same amount of clearance you would need for the 320 to fit right in your bathroom.

All the features of the 321 also seem to match the features of the 320 so you would not be making much of an upgrade by switching the two toilets.

Dometic 320 vs 510


We have come across some different recorded dimensions and the ones given here for the 320 may not exactly match up with the ones provided earlier. The following comes from a website that is comparing these two toilets directly and here is what they have claimed:

The 320- 26.5 inches tall, 14.75 inches wide, and 17.25 inches deep. The 510- 28.5 inches tall, 15 inches wide, and 18 inches deep. The 510 is slightly larger than the 320 in this comparison.

But if you use the previous dimensions above, you will see that the 320 is larger than the 510 except in height. Those earlier dimensions are- 27 x 20.5 x 25 inches.

With the latter dimensions the 510 should fit in the same spot as the 320 but not if the former dimension is correct. We also have a third measurement for the 320 which is- 22 x 14.8 x 19.8 inches.

This all may be accurate if the 320 was made in different sizes. The Dometic website places the dimensions for the 320 at 22 x 19 3/4 x 14 3/4. The third measurement seems to be the most accurate one.

There will also be discrepancies in all of the weights given for the different toilets as well. The best thing to do for accurate measurements is to go to the Dometic website and get their measurements.

Some Additional Words

Upgrading your toilet is going to be a little more time-consuming than you may have thought. While a couple of the Dometic toilets may fit in the same space, others will not.

To get the best idea if a toilet will fit, take the measurement from the wall to the center of the pedestal. If the new toilet lines up with that measurement, then it can replace the old toilet. At least length-wise, width, and height-wise may be a different story.

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