You generally do not need to turn off your gas water heater entirely when leaving for a brief vacation, as modern storage tanks feature highly efficient insulation and standby modes that consume very little gas while maintaining baseline water temperature. However, switching the gas control valve to the "Vacation" setting is highly recommended if you will be away for more than a few days; this significantly lowers burner consumption while keeping the pilot lit. For extended absences spanning several weeks, shutting off the cold water supply valve and turning the gas valve completely off provides ultimate safety and energy conservation.
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