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High-Efficiency Toilet (HETs) Testing

HETUnder federal law since 1992, toilets must not exceed 1.6 gallons per flush (GPF). High-efficiency toilets (HETs) go beyond the standard and use less than 1.3 GPF. Some states are also mandating the use of HETs, and it is anticipated that this trend will continue among other states and may at some point be driven from the federal level. In addition, there are the natural market forces to conserve water to conserve both resources and the dollars associated with using them. It makes sound economic sense to conserve water.

It is important that any plumbing fixtures specified be certified to perform well at whatever consumption rating it is given for it. To that end, Willoughby uses CSA International to certify its plumbing products. The recognized performance and structural standard for both the US and Canada is now the harmonized ASME A112.19.3 / CSA B45.4 for stainless-steel plumbing fixtures. The standard coupled with subsequent certification provides purchasers with the ability to identify products that meet the performance standards for plumbing fixtures. The performance tests specified for toilets are:

1. Trap seal & restoration (Sec. 7.2 & 7.3): Ensures the fixture refills and has the proper seal restored after each flush cycle
2. Water consumption (Sec. 7.4): The amount of water consumed per flush
3. Granule removal (Sec. 7.5): Tests evacuation
4. Ball removal (Sec. 7.5): Tests evacuation
5. Ink-line (Sec. 7.6): Verifies proper bowl rinse
6. Mixed media removal (Sec. 7.7): Tests evacuation
7. Line carry (Sec. 7.8): Tests how well solids are carried through the drain line attached to the toilet

All fixtures should be verified for their certification to this current plumbing standard. It is especially important when considering the latest high-efficiency fixtures now being brought to the market. Willoughby HETs are certified to this standard and can create measurable reductions in water usage while maintaining a high level of performance.

Note: The tests for toilet performance listed above are actually contained in sections of the harmonized ASME A112.19.2 / CSA B45.1 standard for “Ceramic Plumbing Fixtures,” but the performance standards have been made applicable to toilets made from other materials. For example, Sec. 4.5 of the ASME A112.19.3 / CSA B45.4 standard for “Stainless Steel Plumbing Fixtures” says, “Water closets and their flushing devices shall comply with the applicable requirements of ASME A112.19.2 / CSA B45.1.” Structural characteristics are addressed differently for toilets made from different materials, but flushing performance standards are the same for all toilets regardless of the material from which they are made. Also, regardless of consumption (1.6 GPF or 1.28 GPF), they all must pass the same performance standards.