When sourcing Toto toilets, especially the Neorest or Washlet series, you must verify the CE, UPC, or WaterSense certifications to ensure regional compliance. Key technical specs to prioritize include the flush volume (typically 1.0 or 1.28 GPF), the glaze quality (look for CEFIONTECT technology) which prevents debris from sticking, and the Tornado Flush system efficiency. Always request a technical data sheet to confirm rough-in dimensions (standard 12-inch) and electrical requirements for smart models.