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A low-flush toilet (or low-flow toilet or high-efficiency toilet) is a flush toilet that uses significantly less water than traditional high-flow toilets. Before the early 1990s in the United States, standard flush toilets typically required at least 3.5 gallons (13.2 litres) per flush and they used float valves that often leaked, increasing their total water use.
In the United States, Older conventional toilet models, typically those built before 1982, can use 5 to 7 gallons of water per flush. Toilets from the era of 1982-1993 may use a somewhat smaller 3.5 gpf. Modern washdown and symphonic variant standard flush toilets in the United States use 1.6 gpf or 6 lpf (liters per flush). [12]
If the toilet is flushed from a tank, a large holding cistern is mounted above the toilet, containing approximately 4.5 to 6 L (1.2 to 1.6 US gallons) of water in modern designs. This tank is built with a large drain 50 to 75 mm (2 to 3 inches) diameter hole at its bottom covered by a flapper valve that allows the water to rapidly leave the ...
EPACT92 mandated new volume-based efficiency standards for toilets, showerheads and faucets as follows: toilets must be manufactured with a maximum flush volume of 1.6 gallons per flush (gpf); showerheads must be manufactured with a flow rate of 2.5 gallons per minute (gpm) at 80 pound-force per square inch (psi); and faucets must be ...
Future reduction in toilet end use will occur as more homes use low-flush toilets (1.6 gpf, or 6 lpf) mandated by the 1992 Energy Policy Act, or high efficiency toilets (1.28 gpf or 4.85 lpf) which meet the EPA WaterSense specifications. A recent study shows that about 21 percent of all toilets in 5 states (Arizona, California, Colorado ...
In 2009, the company released the Stealth toilet, which used a new technology combining air and water to flush liquids and solids with only 0.8 gallons of water. [1] Niagara's Stealth is currently the only single flush 0.8 gallons per flush (GPF) toilet in the world. [2]