Even though the standard key valve inlet is 3/4″, you may need a larger gas line to span long distances.
In order to get the proper volume and pressure of fuel, you need a gas line that is large enough in diameter to carry it sufficiently. For the most accurate assessment, consult a fuel professional. For a rough estimate, utilize our gas line sizing charts below.
*Make sure the BTUs from your line can supply at least 60-70% of what the burner is rated at.
Propane Gas Line Sizing Chart
Natural Gas Line Sizing Chart
Gas line sizing variables
- Using angled couplings can reduce the volume/flow of fuel
- Adding a 90 degree angle in your line adds the equivalent of 5 feet of distance
- Running different sized lines over various distances is acceptable, but for maximum fuel volume, run larger lines over long distances
- Number of appliances, whether it’s a dedicated line or not; all these factors play a role in volume and pressure
- Pro Tip: if you haven’t installed your gas line yet, consider running it in conduit so that if you ever need to repair or change it, you won’t have to dig it up
You can have great gas pressure, but if your line is too small, you may not get the desired flame. Think about it like filling up a swimming pool. If you reduce the nozzle size significantly, you may have a ton of pressure, but it’s going to take longer to fill up the pool. You need both pressure and volume to get a great flame. This is why the size of the gas line is so important.