The Highline Tall is Kohler's tallest toilet – a full 2" taller than Comfort Height toilets to provide ultimate accessibility and ease of use. With its clean, simple design and efficient performance, this Highline water-conserving toilet combines both style and function. An innovative 1. 28-gallon flush setting provides significant water savings of up to 16, 500 gallons per year, compared to an old 3. 5-gallon toilet, without sacrificing flushing power.