The answer to 'what does water heater do' is a water heater is an appliance that heats and stores water for use in a home. It uses electricity, natural gas, propane, or solar energy to heat water and maintain it at a set temperature, typically between 120-140°F. This allows the home to have a ready supply of hot water for activities like showering, washing dishes, and laundry.
Water heaters come in different sizes and types to meet the hot water needs of a household. Factors like the number of people living in the home, the size of the home, and the number of bathrooms will determine the appropriate size and type of water heater. Proper installation and maintenance of a water heater is important for ensuring it operates safely and efficiently.