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Old 11-11-2018, 07:38 AM   #1
Winnebago Camper
Join Date: Jun 2018
Location: Mansfield, Ohio
Posts: 7
'18 Navion 24V Black Tank used for Toilet AND Sink?

I have discovered that the sink in my bathroom also goes
into my black tank.

Surprised to see this as I would imagine all sinks would
drain into the gray tank.

From what I can tell only my kitchen sink and shower go into
the gray tank.

Does anyone know why winnie would drain the bathroom
sink into the black tank instead of the gray tank?

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Old 11-11-2018, 11:09 AM   #2
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Location: Houston TX
Posts: 881
Many RV manufacturers do this. I suspect it's because the gray tank tends to fill up much faster than the black.
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Old 11-12-2018, 08:57 AM   #3
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Location: Las Cruces, NM
Posts: 407
I think it is pretty simple - most people do not use enough water when flushing the toilet in an RV. Adding water from sink (it is pretty small) along with soap residue, keeps the black tank materials liquid. Anyway, the black tank is bigger. We always fill up our gray tank well ahead of the black tank.
Roger & Mary
2017 Winnebago Navion 24V
2014 Tiffin Phaeton 36GH (Sold)
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Old 11-12-2018, 09:42 AM   #4
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Location: Deep In The Heart of Texas
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Our 2018 View 24D has the bathroom sink draining to the black tank, too. Our first View, a 2006 23H, was plumbed that way, too. Donít recall how our 2012 Navion 24G was ...
Warren and Debbie
2018 Winnebago View 24D
2014 Tiffin Breeze 32BR, 2012 Winnebago Navion 24G, 2006 Winnebago View 23H
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Old 11-13-2018, 07:21 PM   #5
Winnebago Camper
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Location: Mansfield, Ohio
Posts: 7
Thanks for the replies and great info!!

This is a very helpful group thanks!
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Old 11-13-2018, 10:29 PM   #6
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Join Date: Mar 2018
Posts: 383
In our Minnie Winnie the bathroom vanity is directly over the black water tank. I'm thinking simple economics and ease of motorhome assembly here. Since bathroom sinks are not used much, I see no drawbacks to draining it into the black tank.
2016 Minnie Winnie 27Q on a 2015 Ford E450 chassis. Retired U.S. Air Force. Living in Anchorage, Alaska
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Old 11-14-2018, 11:06 AM   #7
Join Date: Jun 2015
Location: The hilly part of Texas
Posts: 330
I think that is common practice. Saves time and money on construction and puts more water into the usually under served black tank.
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Old 11-18-2018, 06:08 PM   #8
Travato 59K
Join Date: Nov 2018
Location: DE.
Posts: 34
I think my 2018 Travato does that as well. The Black and Grey tanks aren’t that big since it’s a class B. But that tends to make sense now.
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Old 11-19-2018, 08:57 AM   #9
2015 Itasca Spirit 27QP
Join Date: Sep 2018
Location: Milford, MA
Posts: 142
Actually this is beneficial especially when boondocking. If your gray water tank fills up faster than the black water tank you can use the bathroom sink instead of the kitchen for some or more of your cleaning needs which can extend your stay before dumping. My Itasca Spirit (Mini Winnie) is set up this way too. From a plumbing perspective, the black water tank is much closer to the bathroom sink and easier to connect.
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black tank, tank

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