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Old 04-14-2021, 02:43 PM   #1
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Smile Plumbing

Before reading this post I would like to warn you that I know very little about plumbing.

Due to the layout of my bus I need to mount my grey water tank under my bed. It will sit on the floor of the bus. I know I will need to raise my shower drain to keep the plumbing inside (I don't want to do any pipes under because I will be traveling in cold climates). Will I need to raise the rain completely over the whole tank? If I do so it will make the shower very tall? Is there such thing as a drainage pump that I can install to push water to the grey water tank?
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Old 04-14-2021, 05:12 PM   #2
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No, but if you mount it lower than the top, when the level inside meets the drain it will start to back up, not good. Look into sump pumps.

There's only 2 rules in plumbing, HOT is on the left, and s**t doesn't go uphill.
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Old 04-14-2021, 06:59 PM   #3
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Originally Posted by o1marc View Post
There's only 2 rules in plumbing, HOT is on the left, and s**t doesn't go uphill.
Your almost there, as I was taught as a young boy, the plumbers creed goes like this:

Hot is on the left, cold on the right,
S**T flows downhill &
payday is on Friday.

Some might add don't chew your fingernails too, but I think it helps boost the immune system.

As for OP's question, yes, you will want to raise the drain for the shower higher than the top of the tank. If not, as Marc said once the water level in the tank reaches drain height it will back up into the shower. There are small pumps you could use to pump into the tank but you will still need to raise the shower to make them work.

A shallow tank and a backwater or flapper valve on the shower drain could help, This 21 gallon tank is only 5" tall https://www.ntotank.com/21gallon-ron...-tank-x7058428
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Old 04-18-2021, 08:09 PM   #4
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or insulate the tank and the bottom of the bus around the drain lines
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Old 04-19-2021, 10:18 AM   #5
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Keep in mind one member here had to redo their plumbing because acceleration and hills had their dirty water coming back up through the shower drain. With a tank in the bus only inches below the drain, you will have similar problems. A sump pump will likely eliminate that problem, I think.
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Old 04-19-2021, 10:32 AM   #6
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Keep in mind one member here had to redo their plumbing because acceleration and hills had their dirty water coming back up through the shower drain. With a tank in the bus only inches below the drain, you will have similar problems. A sump pump will likely eliminate that problem, I think.
Run Hepvo valves in your drain lines to prevent odor back up.

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