Please choose the correct ending to complete the given sentence: Home and Garden: [header] How to turn up a hot water heater [title] Put out any other open flames before adjusting the gas water heater. [step] Natural gas is flammable and, while you should not come in direct contact with the gas, safe is better than sorry. Avoid using candles, cigarettes, or other open flames in the home while you're adjusting the water heater.

Ending1: In the event of a gas leak, smoke will be blown out of the gas heater gradually. [substeps] Note that water lamps or other open flame sources can be killed by direct contact with the gas heater. Ending2: [substeps] You do not need to turn off the gas while adjusting the water temperature. [title] Locate the dial on the front of the water heater. Ending3: [substeps] Open gas homes are often used to heat up a kitchen or bathroom. Unless a fixed-temperature gas stovetop is there, a bank of conventional gas stoves can be used instead. Ending4: They can inflame or damage the gas tank. [substeps] Try unplugging the gas lines in the plumbing department when you switch the water heater on.

Answer format: ending1/ending2/ending3/ending4