The amount of water used by a flush toilet is used as a measure of its efficiency.
|
Volume per Flush
|
Descriptor
|
|
3.5 to 5.0 gallons
|
low efficiency or high flow
|
|
single flush, 1.6 gallons
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low flow or ultra low flow (ULF)
|
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<= 1.28 gallons
|
high efficiency toilet (HET)
|
|
dual flush, < 1.0 gallons and <= 1.6 gallons
|
high efficiency toilet (HET)
|
where:
• A dual flush toilet has a low volume setting for urine and a higher volume for feces. The average water use per day is in the high-efficiency range.
