The key difference between fire glass and gas logs or lava rocks lies in how they affect flame efficiency and heat output. When using gas logs or lava rocks, the flame comes into direct contact with the media, which can lower the flame temperature, reduce burn efficiency, and result in less heat output.
In contrast, fire glass allows combustion to occur above the glass, meaning the flames are unaffected by the media below. This ensures maximum heat output and better flame efficiency, making fire glass a highly effective option for those looking to retain as much warmth as possible from their fire feature while also adding a stylish, reflective look.