Kohler. The industryís first one-piece, 1.0-gpf, high-efficiency toilet with pressure assist technology, the San Raphael Pressure Lite uses compressed air to propel water for strong flushing power. According to the firm, the toilet, which carries the EPA WaterSense label, can save a household of four 7,000 to 10,000 gallons of water a year versus a standard 1.6-gpf model. The unit has Comfort Height seating and an elongated bowl. 800.456.4537.