Flapperless toilets have a separate tank and bowl like traditional toilets, but the parts and configuration inside the toilet's tank are significantly different from those in a traditional toilet. While still a gravity flush toilet, a flapperless toilet uses a design that leads to fewer water leaks and fewer maintenance problems.
Flapper Operation
Traditional toilet tanks have a flapper valve that sits over the large drain hole in the bottom of the tank. When you press the toilet's handle, an arm inside the tank rises, pulling on a chain attached to the flapper. The flapper in turn rises and floats in the water inside the tank, falling closed once the water level drains to a certain point. Flapper chains may bind up, allowing water to drain uncontrollably out of the toilet's tank. A worn flapper will also allow water to leak out of the toilet's tank.
Bucket
With a flapperless toilet, instead of the tank filling up with water, the fresh water that goes into the tank goes into an open container toward the top of the tank, called the bucket. The toilet's bucket holds either 1.28 or 1.6 gallons of water, depending on the toilet's model. When a user presses the handle outside the tank, the bucket rotates so it spills the water into the lower part of the tank. The water washes down a large drain opening in the bottom of the tank.
Gravity Operation
Unlike pressure-assisted toilets, flapperless toilets still use a gravity flush to transport the water from the tank to the bowl. The water that washes down the drain hole in the bottom of the tank enters the bowl through a series of small holes, called ports, which are just below the bowl's lip. Only gravity forces the water through the ports, creating pressure to wash the waste in the toilet's bowl down the drain line.
Fewer Leaks
A flapperless toilet does not use a flapper valve to control when the water flows down the drain hole and into the bowl. Worn flapper valves cause leaks, as do their chains binding up or catching on other parts inside the tank. The other parts in a traditional toilet's tank, such as the fill valve, also sit in the tank's water. The fill valve in a flapperless toilet's tank sits above the bucket but not inside it, meaning the fill valve will develop fewer leaks because the seals in the fill valve do not stay submerged. Fewer water leaks lead to less water consumption.
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