Outdoor gas projects — a standby generator, a pool heater, a fire pit, or a built-in BBQ — all need a properly sized, permitted gas line run to weather-rated pipe. Here is what each involves and what to expect.
Written bySteven Lockhart·Reviewed byMiguel Lopez, Owner & Licensed Plumber (CSLB #974600)·Last reviewedJune 2026 · 4 min read
Quick Answer
A gas line for a generator, pool heater, fire pit, or BBQ is sized for that appliance’s BTU demand and run in approved, weather-rated pipe to the outdoor location, then permitted, pressure-tested, and inspected. High-demand items like a standby generator or pool heater often need a larger line than people expect. This is licensed, permitted work. This is part of our complete guide to gas line repair and installation in West Los Angeles.
Outdoor gas line installation follows the same safety logic as indoor work, with added requirements for weather, burial, and support. We size the line for the appliance’s demand and the system load, route approved pipe to the location (buried to code where it runs underground, protected where exposed), valve it, connect, and then pressure-test and have it inspected. High-BTU appliances are where sizing matters most. This guide is part of our complete resource on gas line repair and installation in West Los Angeles.
An outdoor gas line is a correctly sized gas line run in approved, weather-rated pipe to an outdoor appliance — buried or supported to code — then permitted, pressure-tested, and inspected.
A gas line for a pool heater is one of the highest-demand residential gas runs there is — pool heaters draw a lot of BTUs, so the line frequently needs to be larger than for a typical appliance, and the existing system has to support the added load. We calculate the demand, check whether your meter and system can carry it, and size the line accordingly. Undersizing a pool-heater line leaves it underperforming and is unsafe.
A gas line for a fire pit (or other landscape feature) is usually a smaller demand than a pool heater but still must be sized, run in approved pipe, valved, and permitted. Routing matters outdoors — the line is buried to code where it crosses a yard and protected where exposed — and the connection to the fire feature is made with approved components rated for the application.
A gas line for a BBQ or outdoor kitchen ends the propane-tank shuffle with a permanent, sized line and a shutoff at the appliance. For a full outdoor kitchen with multiple gas appliances, the line is sized for the combined load. As with every gas project, it is permitted, pressure-tested, and inspected before use.
A homeowner installs a standby generator but is told the existing gas line is too small to run it.
New Pro calculates the generator’s demand, confirms the meter can carry the load, and runs a correctly sized, permitted line.
The generator runs at full output on a line that passed its pressure test and inspection — sized right the first time.
The Bottom Line
Outdoor gas — generators, pool heaters, fire pits, BBQs — comes down to correct sizing and weather-rated, permitted installation, with the high-demand appliances needing the most attention to line size. We size, run, permit, and test it. Call any time for a flat-rate quote. More on our gas line page.
Often, yes. Standby generators are high-BTU appliances, so the line frequently needs to be larger than for a typical appliance, and the existing system must be able to carry the added load. We calculate the demand and size it correctly.
No. Pool-heater lines are high-demand and, like all gas work, must be installed by a licensed plumber, sized for the load, permitted, pressure-tested, and inspected. Doing it yourself is unsafe and not to code.
It uses approved, weather-rated pipe and must be buried to code where it runs underground and protected where exposed. The sizing, permitting, testing, and inspection requirements are the same.
Yes, and it ends the propane-tank routine. We run a sized line with a shutoff at the appliance, permitted and tested. For an outdoor kitchen with several gas appliances, the line is sized for the combined demand.
Yes. Outdoor gas piping requires a permit and inspection just like indoor work, ensuring the line is sized, routed, and installed to code and verified before use.
Underground gas lines are buried to a code-specified depth and run in approved pipe with protection where needed. We handle the burial and routing to code as part of the installation.
Written by the New Pro Plumbing content team and reviewed for technical accuracy by Miguel Lopez, owner and California-licensed plumber (CSLB #974600). Pipe lifespans are presented as typical ranges, not guarantees, and any pricing is confirmed in writing before work begins.
What's new: June 2026 — first publication.
We size and run weather-rated outdoor gas lines, permitted and tested. Call any time for a flat-rate quote.
