In a dishwasher, you should generally use one of two types of water:
Cold Water: Dishwashers are designed to heat the water internally to the required temperature for effective cleaning. Therefore, it is safe to use cold water directly from your household water supply. The dishwasher will heat the water as needed during the wash cycle.
Hot Water: Using hot water from your household supply can help the dishwasher reach the desired wash temperature more quickly, which can lead to more efficient and effective cleaning. However, it's essential to ensure that the hot water supply to your dishwasher is not excessively hot. Most dishwasher manufacturers recommend a hot water temperature between 120°F (49°C) and 150°F (66°C) for optimal cleaning and to avoid potential damage to the dishwasher components.
Using water that is too hot (above 150°F) may cause damage to the dishwasher's internal components, such as seals and hoses, and can also increase the risk of injury if you come into contact with extremely hot water.
Keep in mind that modern dishwashers are designed to be energy-efficient and use less water than hand washing dishes. Using a dishwasher instead of washing dishes by hand can help conserve water and energy, especially if you have a full load of dishes to clean.
Always refer to your dishwasher's user manual for specific guidelines and recommendations regarding water temperature and usage. If you have any doubts or concerns about your dishwasher's water requirements, consult the manufacturer or a professional appliance technician.