How do I operate a gas heater with a thermastate during a power outage?

To operate a gas heater with a thermostat during a power outage, first ensure that your heater has a manual ignition feature, as electric ignition systems won't work without power. You may need to manually ignite the pilot light if it has gone out; follow the manufacturer's instructions for this process. Adjust the thermostat to the desired temperature, keeping in mind that it may not function without electricity, so you may need to operate the heater manually. Always prioritize safety and ensure proper ventilation when using gas appliances.