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Old 08-19-2016, 09:18 AM   #1
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Toilets

Why don't motorhomes have regular flush toilets?
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Old 08-19-2016, 09:29 AM   #2
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Too much water used?
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Old 08-19-2016, 09:36 AM   #3
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Too much water used?
But everyone always says use more water to help keep the tanks cleaned. And I'm almost always on full hookups so more water is not an issue.
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Old 08-19-2016, 09:54 AM   #4
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Yes for your case it might not matter.

The other reason I thought of was for the transport - sloshing and splashing both from the bowl and the reservoir behind it

We've also been on some roads that would have rattled the terlet so much that surely at least the porcelain cap on the reservoir would have cracked
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Old 08-19-2016, 09:58 AM   #5
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Yes for your case it might not matter.

The other reason I thought of was for the transport - sloshing and splashing both from the bowl and the reservoir behind it

We've also been on some roads that would have rattled the terlet so much that surely at least the porcelain cap on the reservoir would have cracked
I thought about that too, but both bowls carry water so that's kind of a wash. I could see the tank being a problem, but it shouldn't be that hard for someone to make a toilet with a bladder tank to contain the water.

It sure would be nice to have that water trap to keep the smell from coming up into the coach.
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Old 08-19-2016, 10:00 AM   #6
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Hmm our current terlet HAS a water seal - always an inch or two in it.

Will check on the new DP when we get it.
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Old 08-19-2016, 10:06 AM   #7
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Hmm our current terlet HAS a water seal - always an inch or two in it.

Will check on the new DP when we get it.
It does until you step on the lever. Then it's wide open, and if you have the fan on you get a good dose of sewer air.
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Old 08-19-2016, 10:08 AM   #8
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Why don't motorhomes have regular flush toilets?
Change it out. Put in what you want. Problem solved. They are not that expensive.
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Old 08-19-2016, 10:12 AM   #9
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A few reasons:
  • Even if you keep your foot on the flush for more than a few seconds RV toilets use WAY less water than a home toilet. If you always have hookups then no issue, but if boondocking (which we did in a WalMart on our way to Florida a few weeks ago) you want to conserve water for showers and such.
  • RV toilets weigh much less (no water tank). However, I replaced our MH toilet the 2nd day we owned it with nicer Dometic with porcelain bowl, but it did not add much weight.
  • There is only a small amount of water in the bowl when travelling, so sloshing is not an issue. And if it is, easy to turn pump off, step on flush pedal and remove.
  • There is no "second piece" (the water tank) to eventually come apart, and no top to fall off.
  • Overall it's a simpler system to maintain (less parts).

I do see the point on not having a trap...as sometimes (when the fan is on) we do get a nice wiff of sewer gas. But I'd think a trap might be worse when in motion, since when the water slops back and forth there would be small packets of air (from "down there") that would come up.
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Old 08-19-2016, 10:28 AM   #10
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Some reasons for the RV type of toilet vs. a household unit-

The RV toilet gives you direct access to the black tank when needed. For instance, you can stick a wand down into the black tank to wash residual off the walls and sensors, You can drop a deodorizer tablet (if you use them) directly into the tank, if a sensor fails, you can always look down into the tank to see if it's time to dump the tank.
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Old 08-19-2016, 05:35 PM   #11
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I would think very few RVers would be on full hookups ALL the time.
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Old 08-19-2016, 06:01 PM   #12
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So if you're at a state park with no sewer, after around 20 flushes, you are full, assuming a 40 gallon black tank and two gallons per flush to include tank and bowl. No thanks. The typical RV toilet gives the user options on how much water per flush they use.
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Old 08-19-2016, 07:53 PM   #13
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There is also the fact that a residential toilet take up more floor space to install and space is always a consideration.
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Old 08-19-2016, 08:10 PM   #14
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Don't discourage this guy. Let him put a residential toilet in and we'll get to hear the hilarious results.
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