Please choose the correct ending to complete the given sentence: Computers and Electronics: [header] How to drain a water heater [title] Turn off your water heater. [step] You do not want to drain a water heater that is in operation. [substeps] If you have a gas-powered water heater, turn the switch to " pilot " to keep the water heater's pilot light on, but stop the water from heating.

Ending1: [title] Measure the amount of water that you want to drain out of the water heater. [step] It is generally best to drain more water to prolong the efficiency of the water heater. Ending2: For soups, this should be fixed or stopped whenever cooking. [title] After draining the water, lower the heat temperature up to a low setting to keep your water heater running smoothly. Ending3: Power off the water heater when necessary. If you have a gas-powered water heater and it has a built-in pilot light, make sure it is turned off before draining water. Ending4: If you have an electric water heater, switch off the electrical switch that connects the heater to the electricity. This may be a switch in a board above the heater.

Answer format: ending1/ending2/ending3/ending4