Thermostatic mixing valves seamlessly blend hot water with cold water to ensure constant flow of shower and bath outlet temperatures to prevent scalding. It is common practice in Sydney to regulate the stored water temperature to above 60°C, and to circulate or distribute water at a temperature less than 50°C. By law, the maximum temperature for heater water connected to plumbing fixtures cannot exceed 50°C if used primarily for personal hygeine, including showers, baths, hand basins and bidets.