Choose the USAGE tab. Select each appliance that is used in your house, and estimate its daily usage. (For appliances you use less frequently, such as the clothes dryer, think about how much it is used in a week, and then divide by seven.) Water heaters are on about five hours per day, and refrigerators are on about eight hours per day. Record wattages, your daily usage estimates, and daily energy consumptions for your household in the tables below. Include units.