You can find water resistance rating and recommended installations (covered vs uncovered) in specification section for each eater. Make sure to check that.
Can I Leave My Patio Heater Outside?
The question wether or not you can leave your heater outside usually comes up with portable propane patio heaters.
Like most of other patio heaters, portable propane patio heaters are designed for outdoor use and can withstand the elements. However, they will look better and last longer if you put them under a roof and/or use an outdoor cover to protect them from rain and snow.
So, if your heater is designed for uncovered outdoor use, you can technically leave it outside. However, your heater will serve you longer if you cover it up when not in use.
When installing patio heaters outdoors, you need to first check it's water resistance rating to see of the cover is not required.
Even if the cover is not required, it's best to install your heater under protective roof or weather cover whenever possible. For freestanding models, it's best to put them away or cover them up when not in use.
Even though most patio heaters have all-weather construction, they will last longer and look better if they are protected from rain and snow.