On average, a single waterless urinal will save anywhere from 20,000 to 45,000 gallons of water per year. A large venue with about 20 waterless urinals will save about one million gallons of water each year.
Some urinals continuously flush even if nobody has used it, in this case, they do not likely save a lot of water over a toilet that needs to be manually flushed. For “zero flush” waterless urinals, they estimate that one urinal could save up to 40,000 gallons per year. Of course this would depend on the frequency of use. There is another type of urinal that is billed as water saving which uses on 10 ounces of water per flush. The article discussing this urinal also states that toilet flushing accounts for approximately 40% of domestic water usage, so this is definitely an area we could all improve on, and maybe if they were standard in homes it would end the seat up or down fight.
According to the websites listed by others, that seems right. My take is that they save 100% of water used in urinals. In some sites it also states that besides water and sewer savings waterless urinals are more sanitary since with the dryness bacteria can not grow.
The estimates quoted in other answers come from the propaganda web sites of companies that are selling waterless urinals. A urinal being flushed 45,000 times per year is an extremely frequently-used urinal. A facility with 20 of these urinals all being used with such frequency is even more rare. Also, these estimates don’t account for the water and other resources used to manufacture the filters and other products used to maintain waterless urinals.
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