Why does my LP change so often?

What size jet should I use in a 12000BTU LP gas burner if I change it over to burn Natural gas?

• Answer:

  The surest way to get the right jet size is to ask the original manufacturer of the burner. Not all propane burners are suitable for changing to natural gas, although almost all natural gas burners are suitable for burning propane with a change of jet. The reason that some burners will not burn natural gas is that the flame speed is too low, and flame instability and lift-off can occur. If you cannot get a direct replacement size from the manufacturer, you can start by using a jet which is about 210% larger. As an example, a gas burner using a number 110 Amal jet on propane at 14" water gauge (37 mbar) will probably be OK with a No. 240 Amal jet on methane (natural gas) at 8" water gauge (20mbar). Similarly, a 75 jet on propane equates to a 160 jet on natural gas. After conversion, the air regulator may need to be adjusted to get the flame to stabilise, and the output on natural gas will be much greater than on propane.