What Size Gas Line For A Fire Pit? (Find Out Now!)

What Size Gas Line For A Fire Pit

A magnificent fire pit flame requires two things: enough gas and the proper rigid piping to deliver it. The size of the hard pipe is sometimes overlooked, and the resulting flame might be underwhelming. So, what size of a gas line do you need for the fire pit?

If your gas supply has 100,000 BTU available for your fire pit and the fire pit is 20 feet away from the gas source, you’ll need a 3/4-inch diameter hard pipe. The size of the gas line is highly dependant on how far way your fire pit is from the gas source. 

This article is about using hard piping to transport gas from its source, such as your residential metered supply or a huge gas storage bottle, to the position of your fire pit. This includes charts so you can figure out what size of pipes you need for your fire pit. Let’s get started!

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Gas Hard Piping Size For Fire Pits

The right size of the flame is required for a nice flame. To deliver enough gas, you’ll need a lot of hard piping. Here’s a little example to demonstrate how crucial this is:

If your fire pit is at least 20 feet away from where your gas is, and the supply has 100,000 BTU for the fire pit then you will need to make sure you install a 3/4 inch hard pipe.

If the same fire pit is 100 feet from the gas source, a 1′′ diameter pipe is required. Over 100 feet, the 3/4′′ pipe would only deliver 68,000 BTUs! (Natural Gas), two-thirds of the needed amount!

The Location Of The Gas And Fire Pit

There are two primary difficulties that must be solved in order to have a fantastic fire pit flame:

  • The burner’s BTU rating must match the available gas supply’s BTU rating.
  • To transport the gas from its source to the fire pit, you must choose the appropriate pipe size.

The hard piping size for fire pits charts below is for new gas line installations that are being run directly from the gas source. If you’re connecting to an existing gas line, you’ll need to evaluate the existing system’s surplus capacity to ensure you’ll have enough pressure at your fire pit.

Please note that these charts are just for informational purposes. To get an official number for the pipe you should consult a professional.

How Do You Use The Charts?

Assume you’re planning to put a 75,000 BTU gas burner in your fire pit project, as shown in the Natural Gas Chart. The length of hard pipe from your gas supply to the fire pit construction is represented by the vertical column on the left.

(For every 90-degree curve in the pipe length, add 5 feet to that length.) The top row displays the various gas pipe diameters, such as 1/2 “, 3/4”, and so on.

Select the overall length of the gas line required in the left column. (If your calculation falls between two possibilities, always choose the longer distance). If you require 110 feet of gas line, you would choose the 125 feet option.

Now we’ll look to the right, along the line of figures that will give enough gas for our 75,000 BTU unit. The first number we find is 28, which equals 28,000 BTU, which is insufficient for our 75,000 BTU unit.

The next value to the right is 60, which represents 60,000 BTU, which is still insufficient for our 75,000 BTU unit. Moving to the right, the next figure is 117, which represents 117,000 BTU, which is more than enough for your 75,000 BTU requirement.

Look up to the top row of the chart, above the 117 figure, to see that a 1′′ diameter gas line is required. Because the formulas for Natural Gas and Propane are different, make sure you use the right chart.

Liquid Propane Chart

Liquid Propane Chart
Feed Pipe Diameter (Inch)
Pipe Length In Feet 1/2 3/4 1 1 1/4 1 1/2 2 2 1/2 3
10 275 567 1071 2205 3307 6221 10140 17990
20 189 393 732 1496 2299 4331 7046 12510
30 152 315 590 1212 1858 3465 5695 10110
40 129 267 504 1039 1559 2992 4478 8481
50 114 237 448 913 1417 2646 4343 7708
60 103 217 409 834 1275 2394 3908 6936
70 89 185 346 724 1086 2047 3329 5908
80 78 162 307 630 976 1811 2991 5309
90 69 146 275 567 866 1606 2654 4711
100 63 132 252 511 787 1496 2412 4281
125 54 112 209 439 665 1282 2083 3618
150 48 100 185 390 590 1138 1808 3210
175 43 90 168 353 534 1030 1637 2905
200 40 83 155 325 491 947 1505 2671
300 37 77 144 303 458 887 1404 2492

Natural Gas Hard Pipe Size Chart

Natural Gas Hard Pipe Chart For Sizing
Feed Pipe Diameter In Inches
Pipe Length 1/2 3/4 1 1 1/4 1 1/2 2 2 1/2 3
10 108 230 387 793 1237 2259 3640 6434
20 75 160 280 569 877 1610 2613 5236
30 61 129 224 471 719 1335 2156 4107
40 52 110 196 401 635 1143 1867 3258
50 46 98 177 364 560 1041 1680 2936
60 42 89 159 336 513 957 1559 2684
70 38 82 149 317 476 896 1447 2492
80 36 76 140 239 443 840 1353 2315
90 33 71 133 275 420 793 1288 2203
100 32 68 126 266 411 775 1246 2128
125 28 60 117 243 369 700 1143 1904
150 25 54 105 215 327 625 1008 1689
175 23 50 93 196 303 583 993 1554
200 22 47 84 182 280 541 877 1437
300 17 37 70 145 224 439 686 1139

NOTE: The Gas Hard Piping Size For Fire Pits tables above show the specific pipe sizes needed for a new gas line installation based on the quantity of BTUs. If you’re using an existing gas line, you’ll need to examine the capacity of the current gas line to ensure proper pressure.

This chart is provided for informational purposes only; for further information, consult a Licensed Plumber/Gas Fitter or the NFPA54 (National Fuel Gas Code 72 – current edition).

How Much Does It Cost to Hire A Professional?

It will cost between $300 and $500 to run a professionally installed gas line to your firepit. This cost includes materials as well as labor, but you should always check with your contractor to see what is included in the price.

It’s best to always get at least three quotes so you know that you’re getting the best deal. Also, it’s a good idea that you check reviews with the companies that you’re thinking of hiring. This way, you don’t pay for a job that’s likely to cause a new slew of issues.

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Related Questions

Do you need a gas line for a fire pit?

Having a natural gas fire pit is a great choice especially if you’re looking to add any type of permanent fire feature in your little backyard oasis. However, keep in mind that a permit is required to install a permanent gas line.

Unless of course there’s already an existing gas line that’s hooked up. But, if there’s not, you will need a professional to come and install the line according to code.

Which pipe is best for gas lines?

For gas lines, the best type of pipe would be corrugated stainless steel tubing (CSST) which is good for the installation of gas appliances.
The pipes bend so you don’t have to use joints and fittings, which both increase the likelihood of gas leaks down the line. Not to mention, they’re easier than a steel pipe to work with as they weigh significantly less.

Do gas fire pits keep you warm?

The heat that’s generated by a gas fire pit is usually enough to keep you warm, but should not be used as a primary source of heating.

Heather Robbins

Heather is a passionate writer who loves anything DIY. Growing up, she learned everything from home repairs to design, and wants to share her tips with you. When she's not writing, she's usually hiking or searching for her next DIY project.

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