Lava rocks disperse the flame in different directions. They heat up and start radiating heat. A gas fire pit using lava rocks will radiate heat more like a wood fire than a gas burner without lava rocks.

What do lava rocks do for a fire pit?

Functionally, fire pit lava rock provides a semipermeable barrier that protects fire pit burner components from the elements, facilitates the even distribution of flame and the resulting heat, and shields the gas burner from direct exposure to the surface flame.

How long do lava rocks last?

With traditional use, lava rocks should last for about two years before replacements are required because of the build-up of grease, which can affect flavor, as well as the natural deterioration of the lava rocks from frequent heating and cooling after use.