Tuesday, January 29, 2008

High Efficiency Toilets (HET)

"Thus, the High Efficiency Toilet (HET) is becoming a significant part of the toilet fixture marketplace as manufacturers recognize the compelling need for water-efficient products and water authorities and municipalities incorporate them into their toilet replacement programs. Furthermore, builders participating in "green building" programs, such as the U.S. Green Building Council's Leadership in Energy and Environmental Design (LEED) and The Metropolitan Water District of Southern California's California Friendly Model Home program install HETs to accumulate water efficiency credits or to comply with program requirements.

The HET is defined as a fixture that flushes at 20 percent below the 1.6-gpf/6.0-lpf maximum or less, equating to a maximum of 1.3-gpf/4.8-lpf. This 20% reduction threshold serves as a metric for water authorities and municipalities designing more aggressive toilet replacement programs and, in some cases, establishing an additional performance tier for their financial incentives (e.g., rebate and voucher programs). Previous field studies in the U.S. and Canada have demonstrated that the average flush volume of dual-flush toilets in residential applications ranges between 1.1 and 1.2 gals."