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Old 09-17-2020, 02:09 PM   #1
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Has anyone installed a Dometic 320 in a 2109S?

I have a 2019 Rockwood Mini Lite 2109S that has an original equipment Dometic model 300 toilet. I would like to upgrade to a Model 320 for the elongated ceramic bowl and traditional seat.

I know a lot of people have installed 310s in other Rockwood models, but I am interested in a 320. I know it is larger and that the space allowed in a 2109S is pretty tight, so I would like to hear from anyone who has actually done this swap.

Rockwood model 2205s has the same bath configuration.

Thanks folks,
Gene
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Old 09-17-2020, 03:57 PM   #2
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I replaced my 300 with a 320 in a 2018 21FBRS. I had to do a little cutting behind the toilet to get it to fit. Not difficult and it didnít look too bad to SWMBO (she who must be obeyed).
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Old 09-17-2020, 04:42 PM   #3
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Thanks for the reply Joe.

If you have a minute, I have a few more questions. Looks like our bath has the same floor plan as mine.

So you had to cut into the blank panel of the linnen cabinet?

Was there no problem side to side or with the extra length of the elongated bowl in the floor area?

Will the toilet lid open fully and stay open or does the cabinet restrict it's travel?

Gene
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Old 09-18-2020, 10:31 AM   #4
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Has anyone installed a Dometic 320 in a 2109S?

Quote:
Originally Posted by Gene W View Post
Thanks for the reply Joe.

If you have a minute, I have a few more questions. Looks like your bath has the same floor plan as mine.

So you had to cut into the blank panel of the linnen cabinet?

Was there no problem side to side or with the extra length of the elongated bowl in the floor area?

Will the toilet lid open fully and stay open or does the cabinet restrict it's travel?

Gene


Hi Gene,

No problem with the lid staying up.

Side to side was fine.

The cut was into the area at and below the raised trim piece below the linen door to accommodate the additional length. It was a bit of a pain, but it worked. Were I to do a replacement again, I would have gone with a 310.

My current camper is a 2020 2205S which came from the factory with a 310, and the unit fits fine. If I ever get a wild hair, I will replace the plastic seat with a wood one from Loweís, but not yet.

Joe
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Old 09-18-2020, 11:23 AM   #5
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Thanks again Joe. That' good information. If the 310 was elongated there would be no question about it. I'll kick it around a little more.
I appreciate our help!

Gene
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Old 09-18-2020, 02:40 PM   #6
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The Dometic installation guide shows the rough in dimensions. I used this to determine if the 320 would fit in our Cedar Creek which fortunately it did.
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File Type: pdf installation_manual_300 Series.pdf (1.09 MB, 27 views)
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Old 09-18-2020, 04:00 PM   #7
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A 310 barely fit in our 2109s, if I remember correctly the 320 is about an inch longer from center line of drain to the back of toilet. If that’s the case you would have to likely rework the cabinet and/or door.
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Old 09-18-2020, 08:06 PM   #8
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Dometic 320

I replaced our Dometic 300 in our Gray Wolf 2019 with a 320, The install was easy, only thing I am disappointed with is the flush with the 320 is weak. The flush water does not circulate around the whole bowl area. I did not get the model with the built in hand sprayer that I did not think I would use. I know now why they have that model.
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Old 09-19-2020, 02:53 AM   #9
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Quote:
Originally Posted by 01tundra View Post
A 310 barely fit in our 2109s, if I remember correctly the 320 is about an inch longer from center line of drain to the back of toilet. If that’s the case you would have to likely rework the cabinet and/or door.
There is one other option. The raised hump, behind the seat is the problem fitting a 320 because it extends further rearward than than the hump on the 310.

It does not really have to because on both all it does is cover the vacuum breaker.

I used a mini grinder with a diamond wheel and very carefully cut the rear end of that hump so the 320 would fit our camper.

Who wold have thunk an elongated seat on a crapper that allowed a more relaxed experience would be such a luxury............but it is!
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Old 09-19-2020, 09:51 AM   #10
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Quote:
Originally Posted by DouglasReid View Post
There is one other option. The raised hump, behind the seat is the problem fitting a 320 because it extends further rearward than than the hump on the 310.

It does not really have to because on both all it does is cover the vacuum breaker.

I used a mini grinder with a diamond wheel and very carefully cut the rear end of that hump so the 320 would fit our camper.

Who wold have thunk an elongated seat on a crapper that allowed a more relaxed experience would be such a luxury............but it is!
Do you have any pictures? Was it just a plastic cover that you had to cut or was it the porcelain?
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Old 09-19-2020, 11:25 AM   #11
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I appreciate the additional information from each of you. I had already studied the dimensions in the installation guide and it appeared that the only real conflict would be the extra length in the rear. Joes post confirmed that. After reading it I thought I might remove the flat panel from bottom section of the linnen cabinet, and then build a shallow box by extending the rails and stiles 90 deg to the rear and replace the panel on these extensions. In other words, rebuild the recess deeper.

Looking at the pictures of the 320 last night I had considered removing that rear cover and maybe relocating the vacuum breaker but I saw Douglas' post suggesting cutting the cover and that ma be the best solution. His bathroom is configured differently.

The post that concerns me the most was from kgriff5667 regarding the poor flush quality of his 320. Has anyone else had the same experience?

Thank you to all who have posted information on this thread

Gene
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Old 09-20-2020, 07:22 AM   #12
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Originally Posted by 01tundra View Post
Do you have any pictures? Was it just a plastic cover that you had to cut or was it the porcelain?
I do have some pictures that I will post here. I was also installing a Bidet simultaneously so I had to alter the front of the hump too, but if you are not installing the same model Bidet that would not be necessary.

The 320 is all ceramic, there is no plastic on that hump.

One piece of advice, if you do this get a solid diamond wheel with no spaces. The spaces make for faster cuttig but also chip the edge of the porcelain slightly. In my case it all sits behind the rear end of the bidet so you dot' see it but I know it is there.

The first pic shows the space,

the second shows all the cutting on the 320. The black duck tape was there to show me the cut line and to protect the ceramic from the blade where I did not want it cut. It is actually two layers of thick black tape. You can see the vacuum breaker through the cut in that hump.

The third shows the space with the T for the water supply for the Bidet T

The last is the toilet and bidet installed.

The Bidet is a Swash 1400 by Brondell. We LOVE it!!
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