How do you verify a supplier for Commercial Rice Steamer Cabinet water supply?

Please verify the following points and require itemized written supplier responses:（Commercial Rice Steamer Cabinet water supply） Confirm cookware, steamer tray, noodle basket or grill plate size, capacity, heating method, voltage, power, three-phase supply, grounding, ventilation and drainage. Confirm temperature range, heat-up speed, continuous operation, water-shortage protection, overheat protection, leakage protection, energy use and cleaning. Check heating modules, coils or elements, controls, glass-ceramic plate, cooling fan, water circuit, cabinet door, seals, trays, baskets and spare parts. Define capacity, accuracy, materials and operating environment before requesting quotes on a uniform basis. Request specification sheets, test reports, certificates, maintenance manuals and spare-part lists. During acceptance, verify appearance, dimensions, functions, safety protection and packaging, and keep test records. Do not compare unit price alone; include customization, freight, spare parts, after-sales support and downtime risk. Keep written records of inquiries, confirmations, FAT, acceptance and warranty commitments.