Flush mounted patio heaters are perfect if you are looking to heat your patio without sacrificing the looks. These heaters can be recessed into the ceiling nicely blending in with the decor of the space. Flush mounted patio heaters are powered by electricity and they can be installed indoors as well as outdoors. The biggest downsides of these heaters are that they are less powerful than gas and are more expensive to operate. However, the upside is that electricity is a cleaner energy source compared to gas, so they are more environmentally friendly.