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Bathroom layout with urinal for tiny house

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Hello -

We just finished building a tiny house on wheels.   The bathroom really gave us fits in terms of design, especially since our project chief (teenager) demanded that it be off-grid, so gravity water pressure only.   We finally figured it out, and it works pretty good.  In case it saves someone else a bunch of headaches, here are some pics, and we would be happy to answer any questions.

We wanted a urine-diverting compost toilet (Nature's Head, great product by the way), but didn't want a special drain from the removable urine tank, since this is not a live-in deal but more of a "spare room" for teenagers and guests.   And, males don't want to sit to pee, as a general rule, so how to fit a urinal in a 4x7' space with a toilet, sink, shower, and interior propane water heater?   The photos show our solution, and it's been working great for six months.

The shower is built on a 24x27" pan with galvanized sidewalls, and is based on a Mr. Heater BOSS XCW 20 propane camp shower, which pulls water out of a 15-gallon drum.  The drum is supplied by an overhead RV tank through gravity pressure, with a manual on/off fill valve.  You can see and hear the water filling the drum, so you know when to turn it off during a refill.  We get 3-4 comfortably long showers out of the drum.

Thanks, looking forward to exploring the forums.
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Location: Ontario, climate zone 3a
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I love love love the urinal under the sink that gets rinsed with hand washing!  I built a dry toilet with a Kildwick separator in it, but would like to add a urinal so the men don't have to sit.  The under sink idea is genius double-duty engineering that will keep a smell from forming too.  We will be kollecting... er, collecting pee for fertilizer in our dry toilet.
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