Natural gas heaters can be safe for indoor use if they are installed and used properly. It’s important to make sure that your natural gas heater is properly ventilated to prevent the buildup of harmful gases, such as carbon monoxide, in your home. It’s also a good idea to install a carbon monoxide detector to alert you if levels of CO become too high.
Additionally, it’s important to regularly inspect and clean your natural gas heater to ensure that it is working properly. If you have any concerns about the safety of your natural gas heater, it’s always best to consult with a professional.