Question: is 1.28 gpf better than 1.6?
Answer: High-Efficiency Toilets (HETs) flush at a rate of 1.28 gallons per flush, saving 20% more water than their 1.6 gpf counterparts. Flushing performance on our HETs is just as good as on our 1.6 gpf toilets, making it an easy option to save water. ... They are the ultimate in water-saving toilets.