Many wonder about the safety of using a patio heater in a gazebo. A gazebo is a nice place to sit during the evening and does get cold like a patio during the cooler months of the year. It is fine to run a patio heater in a gazebo under certain circumstances.
Make sure that the gazebo is not enclosed. It must be wide open like your patio would be outside of the beams that are holding up the roof. But if you are really that concerned or there is some enclosed space inside, buy an indoor/outdoor heater which are safe to use even in completely enclosed spaces.
The best fuel source for a heater used this way will be electric. Natural gas lines running to the gazebo will be far too expensive. Propane is an option but it will take up more space. You will have to deal with the cords for the electric heater but it’s a much easier fuel source than the others.
One concern about using a heater inside gazebo is limited space. Full sized heaters might be a little too big for your average sized one. One option to consider as an alternative might be to use the electric wall heaters. These could be hung inside the gazebo saving some space and keeping the device out of the middle of the area. One could also get a standing infrared heater and point it towards the gazebo while it sits on the outside of the space.
Whatever option you choose to do, be safe. Always go with the manufacturers directions and recommendation on the box. Don’t ever try to make up your own version of what is or what is not safe.