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Older toilets typically use 3.5 gallons of water per flush (gpf) or more. Standard new toilets use 1.6 gpf. Toilets that use an average of 1.28 gpf or less are called High Efficiency Toilets (HETs) and are now required by the state's building code in all new homes in California.

HETs are available in dual-flush, pressure-assist and conventional gravity-flush models. Dual-flush toilets have two buttons: one for a half flush and the other for a full flush. The average gallons per flush of dual-flush toilets is based on the average of one full flush and two half-flushes. In the past, some models of low-flow toilets didn't work well, but the majority of today's High Efficiency Toilets perform well and don't require multiple flushes.

To give buyers confidence that their products won't require double flushing or get plugged up regularly, many manufacturers take part in the Maximum Performance (MaP) Testing Program. This voluntary program provides flushing performance scores for more than 2,200 toilets. For information about MaP testing for toilets, go to www.map-testing.com.

The Green Product Directory features a selection of WaterSense–labeled High Efficiency Toilets that have been independently verified to perform well. Each of these toilets has a flush volume of no more than 1.28 gallons per flush* and has a MaP score of at least 600. Many manufacturers regularly introduce new models of High Efficiency Toilets, so think of this list as a starting place when shopping for a new toilet.

*To figure the average flush volume of a dual-flush toilet, multiply the partial-flush gpf by two, add the full flush volume and divide the sum by three. So if the partial-flush volume is 1.1 gpf and the full-flush volume is 1.6 gpf, the average flush volume = (2x1.1)+1.6 = 3.8/3 = 1.27 gpf

American StandardH2Option Dual Flush Toilet
This dual-flush High Efficiency Toilet meets EPA WaterSense criteria and lets you choose a full 1.6 gallon flush or a partial 1.0 gallon flush using 37% less water. LEARN MORE ►

CaromaProfile Smart 305 Toilet
Caroma's Profile Smart 305 Toilet has a unique design with an integrated sink for enhanced water savings. After flushing, fresh cold water is directed through the faucet for hand washing and drains into the tank to be used for the next flush. LEARN MORE ►

ForemostTotal Toilet Ease Two-Piece Toilet
High Efficiency Toilets can save you both water and money. Foremost's HETs are engineered to maintain bowl wash performance and not require an additional flush, while saving water. LEARN MORE ►

KohlerSan Rafael One-Piece Toilet with Pressure Lite Technology
Kohler's one-piece San Raphael toilet with pressure vessel technology delivers commercial-grade flushing. Its 1.0-gallon flush setting reduces your water use by more than 30 percent over 1.6-gallon toilets, adding up to water savings of more than 5,000 gallons per toilet, per year. LEARN MORE ►

LowesAquaSource 1.1 GPF Toilet
Lowe's High Efficiency Toilet combines a low price with water savings year after year. LEARN MORE ►

MansfieldQuantumOne Toilet
This 1.0 gpf toilet uses a pressure-assist, high efficiency Sloan Flushmate IV flushing system. It saves up to 40% more water than conventional 1.6 gpf flushing systems. LEARN MORE ►

NiagaraStealth Toilet
Niagara’s 0.8 gpf, ultra high-efficiency toilet (UHET), goes a step beyond the standard water-saving toilets on the market. The Stealth Toilet saves up to 20,000 gallons of water a year, according to Niagara, and has an extremely quiet flush. LEARN MORE ►

TotoAquia Dual Flush Toilet
TOTO's Dual-Max flushing system is found on several of their High Efficiency Toilets. It offers the option of a 1.6 gallon flush or 0.9 gallon flush. LEARN MORE ►

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