You want a 150,000 BTU firepit? That's like a gas bonfire! Most gas fire pits I've seen are in the 30-50k BTU range, a few are 100k.
1/2" pipe run 55ft is good for about 70 cu. ft. / hour, assuming 2 PSI or less supply. At 1100 BTU per cu. ft., that will get you 77,000 BTUs, somewhere in the upper end of what I've seen for fire pits.
For 150,000 BTUs, you are going to need about 136 cu. ft. / hr so for 55ft you would need a 3/4" pipe, all the way back to your trunk line (I'm not counting your total demand on that trunk line)..
Answer from JRaef on Stack ExchangeBackyard Escapism
backyardescapism.com › blogs › the-escapist › sizing-for-your-outdoor-fire-pit-gas-line-how-to-determine-the-right-size-for-optimal-performance
Sizing for Your Outdoor Fire Pit Gas Line: How to Determine the Right Size for Optimal Performance
Generally, the most common gas line sizes used for residential fire pits are 1/2-inch or 3/4-inch diameter pipes. A 1/2-inch pipe can typically support fire pits with a BTU output of up to 100,000 BTUs, while a 3/4-inch pipe can accommodate ...
Themagicoffire
themagicoffire.com › home › exploring fire pit gas supply › gas pipe size for fire pits. what you need to know
Gas Pipe Size for Fire Pits and Why It Is So Important
August 1, 2025 - Now, look up to the top row of the chart above the 117 figure, and that shows that you will need a 1″ diameter gas pipe. The calculations are different for Natural Gas and Propane, so be sure to use the correct fire pit gas pipe size chart.
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You want a 150,000 BTU firepit? That's like a gas bonfire! Most gas fire pits I've seen are in the 30-50k BTU range, a few are 100k.
1/2" pipe run 55ft is good for about 70 cu. ft. / hour, assuming 2 PSI or less supply. At 1100 BTU per cu. ft., that will get you 77,000 BTUs, somewhere in the upper end of what I've seen for fire pits.
For 150,000 BTUs, you are going to need about 136 cu. ft. / hr so for 55ft you would need a 3/4" pipe, all the way back to your trunk line (I'm not counting your total demand on that trunk line)..
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With 1/2 lb gas it will not be possible to support the fire pit you have in mind with 1/2" pipe. You can either repipe clear back to the meter with the right size of pipe or use bottle gas.
Spotix
spotix.com › blogs › learning-center › gas-line-sizing-for-fire-pits-fireplaces-and-outdoor-kitchens
Gas Line Sizing for Fire Pits, Fireplaces, and Outdoor Kitchens: What Contractors Need to Know – Spotix
October 14, 2024 - Not true! Burners often have much smaller inlets than the gas line feeding them. For example, a fire pit might have a 1/2" inlet, but depending on the BTU output and distance from the gas source, you might need a 1" or larger gas line to ensure ...
BackYard Assist
backyardassist.com › home › is 1/2 gas line sufficient for an outdoor fire pit? 4 items
Is 1/2 Gas Line Sufficient For An Outdoor Fire Pit? 4 Items - BackYard Assist
December 27, 2023 - Let’s dive into this myth a bit further. A 1/2 gas line is not usually sufficient to run much other than a barbecue grill. However, don’t lose hope yet as many fire pits have similar BTU ratings to barbecue grills.
Montana Fire Pits
montanafirepits.com › home › blog › a guide to gas line sizing: get the most out of your fire pit
A Guide to Gas Line Sizing: Get the Most Out of Your Fire Pit - Montana Fire Pits
March 13, 2025 - Find your distance: Look in the left column for the distance (in feet) from your fire pit to the fuel source (your gas meter or propane tank). Check your pipe size: In the top row, find the size of your gas pipe (e.g., 1/2″, 3/4″, 1″).
Celestial Fire Glass
support.celestialfireglass.com › home › gas line sizing for outdoor fire pits
Gas Line Sizing for Outdoor Fire Pits - Celestial Fire Glass Support
September 26, 2025 - Most of our customers find their current installations are sufficient to support a gas grill and a fire pit, but that depends on several factors including the BTU rating of the burner.
Trouble Free Pool
troublefreepool.com › forums › equipment - build, use, and repair › pumps, filters, and plumbing
Gas Line Pipe Sizing? | Trouble Free Pool
February 14, 2023 - My concern - they lazily put in ... much, Danielle · Click to expand... According to the heater manual, with only the heater on the line, at 125' you need 1.25" pipe....
Montana Fire Pits
montanafirepits.com › home › gas lines sizing guide
Gas Line Sizing Guide | Natural Gas and Propane | Montana Fire Pits
August 20, 2019 - 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.
Trendzbooster
trendzbooster.com › outdoor-propane-gas-fire-pit-gas-line-size
Outdoor Propane Gas Fire Pit Gas Line Size - TrendzBooster.com
December 4, 2024 - A common guideline to follow is: Up to 40,000 BTU: A 3/8 inch gas line is usually sufficient. 40,000 to 80,000 BTU: A 1/2 inch gas line is recommended for adequate flow and pressure.
HPC Fire
hpcfire.com › home › understanding gas line sizing
Understanding Gas Line Sizing - HPC Fire
gas fire pits
HPC Fire Inspired is often confronted with many important questions about our Gas Fire Features. Proper gas line sizing is a recurrent question that requires a thorough response. So, how does one know the proper gas line size for their unique design? This Tech Talk will walk you through the ... Worked there almost 13 years ago. Wonderful company built from the ground up.
DoItYourself.com
doityourself.com › doityourself.com community forums › plumbing, piping, water heating, wells, air & water filtration and conditioning › plumbing and piping › natural gas line math help
Natural gas line math help - DoItYourself.com Community Forums
June 5, 2020 - Air fittings are not approved for natural gas. You only need a disconnect at the firepit end and a 1/2" disconnect is fine for that end. ... What kind of pipe are you running to the fire pit?
Houzz
houzz.com › discussions › 2505200 › running-gas-line-to-a-fire-pit
Running gas line to a fire pit
I have a 1/2" stub out on the side of my house and need to run about 50' of tubing and/or pipe to a fire pit. I got a quote from a plumber for over $800.....which just sounds crazy to me. So I will be doing it myself. I have to run about 20' underground, and then about 20' or so through a 3&qu...
Fire Pit Outfitter
firepitoutfitter.com › blogs › gas-fire-pit-tips-and-tricks › what-size-gas-line-do-i-need-for-my-gas-fire-pit
Fire Pit Gas Line Size | Firepit Outfitter – Fire Pit Outfitter
November 25, 2019 - Typically the bigger the burner the more BTU’s you need to your fire pit.
JustAnswer
justanswer.com › plumbing › ffvon-i-m-adding-outdoor-patio-natural-gas-grill.html
Expert Q&A: Adding Gas Line for Outdoor Grill and Fire Pit
Output from house to current fire pit. ... Ok, your main needs to be 1 1/2". It's actually borderline 1 1/4".
Heating Help
forum.heatinghelp.com › plumbing
Upsizing Fire Pit Gas Line? — Heating Help: The Wall
June 14, 2018 - You're right its a 1/2" line from the house, and they stepped up to run the line under ground, then reduced it again to 1/2" at the Fire Pit. It's a custom built fire pit not a pre-fab, the only thing thats controlling the flame is the line from the house, 20' to the pit, and the pipe coming out of the ground.
YouTube
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What Size Gas Line Do I Need for My Fire Pit? | Episode 2 ...
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DIY Home Improvement
diychatroom.com › home › forums › home improvement › plumbing
Need Help Determining Feasibility of Natural Gas Firepit | DIY Home Improvement Forum
I can hire someone to dig the trench for about $500 so the total cost would be $2,500. This plumber did not recommend going off the pool line, he felt the 3/4 inch BBQ line was more than sufficient. When I approached a second plumber they were concerned that the 3/4 inch line would not be big enough. The firepit burner I want to use has a rating of 297,000 BTU's per hour! I cannot believe how much gas it uses. I have no idea if that rating is for having flames 1-2 feet tall or just a warm glow.
Reddit
reddit.com › r/plumbing › outdoor bbq and fire place gas line
r/Plumbing on Reddit: Outdoor bbq and fire place gas line
November 20, 2024 -
Hello all. I want to run a outdoor gas line from my house to a fire place and grill. its a 40' run from the gas line at the house to the fireplace the bbq would be in the middle.
The gas supply is its 3/4 iron pipe and was for a no longer used fireplace. Can I run a grill and out door fire place off that? would it help to go to 1" poly pipe? I am handy i understand how to run the lines I just dont know about the pipe sizing and capacity. Thank you for any advise