When I installed my fire pit, I was disappointed in the height of the flames. It was only about 8 inches max. So first I bought a new adjustable regulator (0-20 psi), and tested again. Now the gas pressure was much higher, and it put out more gas, but there was not enough oxygen to burn, so the flame was about 3-5 inches from the burner when it was on high.So I bought this mixer to replace my original of 90,000 btu's. The holes in this mixer were much bigger, and it lets in much more oxygen, andSee full review