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Old 17-01-2020, 06:08   #1
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How does an electric toilet work?

How does a basic electric toilet (eg, Jabsco) work? How is the material evacuated? Does it have any "crushing" mechanism?
Thanks
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Old 17-01-2020, 06:45   #2
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Re: How does an electric toilet work?

Typically there's a macerator which evacuates the bowl. Basically, an impeller pump with sharp, metal blades.

The macerator motor may also have the rinse water pump on the other end of the shaft. One thing I dislike about this arrangement is that you don't have separate "wet" and "dry" modes, so you're sometimes filling the bowl when all you really want to do is empty it. Beyond the inconvenience, this also tends to fill up the holding tank faster.

Some electric models (and every hand-operated model I've seen) do offer the wet and dry options.
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Old 17-01-2020, 06:47   #3
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Re: How does an electric toilet work?

On a single shaft, when you press the button, one pump sends in water to the bowl while the bowl contents go by a chopper blade and then are pumped out through a joker (duckbill) valve. For more detail, get a Jabsco parts drawing online, or wait for the forums "Sewage Queen" Peggy Hall, who knows all there is to know about blackwater, to come online and respond.
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Old 17-01-2020, 06:52   #4
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Re: How does an electric toilet work?

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Originally Posted by Srah 1953 View Post
How does a basic electric toilet (eg, Jabsco) work? How is the material evacuated? Does it have any "crushing" mechanism?
Thanks
They use a macerater type pump .

This type pump can only grind up toilet paper and poop ..no paper towels, no short tail bilge rats, no handy wipes ...

These toilets work very well.

A good brand is https://www.dometic.com/en-us/us/pro...n/boat-toilets

Many other brands available


Best when toilets use fresh water to flush

Next time you visit a boat show have a good look at whatís available

I prefer electric toilets that have the electric ..push to flush ..button mounted on the toilet itself...not on a bulkhead
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Old 17-01-2020, 08:15   #5
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Re: How does an electric toilet work?

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Originally Posted by Srah 1953 View Post
How does a basic electric toilet (eg, Jabsco) work? How is the material evacuated? Does it have any "crushing" mechanism?
Thanks

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Old 17-01-2020, 08:29   #6
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Re: How does an electric toilet work?

Hi Srah...

Sea water electric toilets have two pumps, one that pulls in flush water--typically an impeller (which is called an impeller because it "impels" liquid to go through it), but it can be an electrically operated diaphragm--and another impeller that simultaneously pulls waste out of the bowl while it pushes it down the discharge hose, with something called a macerator--essentially just a blender blade--in between 'em. As impellers become worn, they become less efficient...dry friction heat from running without any water or waste going through 'em will destroy one in as little as 1 minute.To flush, push a button installed in the wall next to it. Most sea water electric toilets draw about 15 amps/flush and use about 2 liters flush water.

There are some that are more sophisticated, have more powerful pumps and fancier flush buttons, some designed to use flush water from the boat's fresh water tank, but that covers the bare bones basics. The most common example of the basic sea water electric toilet is the Jabsco 37010. You can read how it works and how its installed more detail in these pieces Jabsco 37010 Series Electric Toilet and Jabsco 37010 owners manual

I'll be glad to answer any additional questions.


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Old 17-01-2020, 09:09   #7
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Re: How does an electric toilet work?

I have an upflush electric toilet in my house and it's the same design with the macerator and pump. The drain is only 3/4" pipe which seems crazy but it works well.
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Old 17-01-2020, 10:02   #8
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Re: How does an electric toilet work?

Excellent. Thank you so much.
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