The main safety precautions that should be taken when using an indoor propane heater are to make sure there is proper airflow, ensure the heater is made for indoor use and to choose a safety-certified propane heater. Users should also be aware of the dangers of carbon monoxide poisoning while using a propane heater.
All propane heaters create carbon monoxide, which is why it's important to make sure there is good airflow and proper ventilation while using them. While indoor propane heaters do release carbon monoxide, it's usually a very small amount. Another reason it's better to use a propane heater made for indoor use is they use less propane and release less carbon monoxide than outdoor models.
It's also recommended to use a carbon monoxide alarm while using an indoor propane heater. Carbon monoxide alarms are designed to give a warning before symptoms of poisoning occur. Safety groups, such as Underwriters Laboratories, test propane heaters and certify them if they meet safety regulations. These certified models are often a better choice.
Pets and children should be kept away from indoor propane heaters. Heaters should also be placed at least three feet away from flammable objects, such as curtains, bedding, drapes and upholstery.