Equipment know-how

Natural Gas vs Propane Equipment

By the FoodServiceNerd editorial team·Reviewed against primary sources·Updated August 2026·How we research & cite

How LP and natural gas differ in BTU and pressure, why equipment needs an orifice conversion, and how to convert commercial gas appliances safely.

Educational, not legal advice. Codes vary by jurisdiction — always confirm with your local health department and building authority (AHJ).

FoodServiceNerd EditorialResearched from the FDA Food Code, manufacturer specs & industry sourcesUpdated Aug 2026

Same job, different gas

Commercial gas equipment burns one of two fuels: natural gas (NG), piped from the utility, or liquid propane (LP), delivered in tanks. City locations usually have natural gas at the meter; rural sites, food trucks, and buildings off the gas main run propane. A given appliance is set up for one or the other from the factory, and moving it to the other fuel requires a proper conversion — not just a different hookup.

Why they aren't interchangeable

The two gases differ in two ways that matter at the burner: energy density and supply pressure. Propane packs far more energy per cubic foot — roughly 2,500 BTU per cubic foot versus about 1,000 for natural gas — and it's delivered at higher pressure. To get the correct heat output, propane needs a smaller orifice (the metered hole feeding each burner) and natural gas needs a larger one.

Property	Natural gas	Propane (LP)
Energy content	~1,000 BTU/cu ft	~2,500 BTU/cu ft
Typical appliance pressure	Lower (inches WC)	Higher (inches WC)
Orifice size	Larger hole	Smaller hole
Supply	Utility pipeline	Refillable tank

Send high-pressure propane through a natural-gas orifice and you get dangerous, oversized flames, sooting, and equipment damage. Send natural gas through a propane orifice and you get weak, undersized flames. The fuels really are not swappable at the hose.

What a conversion involves

Most commercial gas equipment ships with a conversion kit — replacement burner orifices (spuds), sometimes pilot orifices, and a pressure-regulator spring or setting change. A qualified technician swaps the orifices, resets the regulator to the correct manifold pressure for the new fuel, and verifies the flame. Done correctly, the appliance delivers the same total BTU output as before on the new fuel. This is work for a licensed gas tech, not a DIY fix, and it should be checked with a manometer.

Confirm the model is field-convertible (most are; a few are not).
Use the manufacturer's kit for that model.
Have a licensed technician set manifold pressure and check for leaks.
Keep the conversion documentation for inspectors and warranty.

Which should you choose?

If natural gas is available at the site, it's usually cheaper per BTU and never runs out mid-service. Propane wins where there's no gas main, for mobile operations, and as a backup fuel. The equipment performs the same either way once it's set up correctly — the decision is about your site and supply. Size your total gas demand with the gas BTU load calculator, and if you're comparing fuel types broadly see gas vs electric equipment.

Signs an appliance is on the wrong fuel

Equipment that's mis-set for its gas gives itself away at the flame. Watch for these before you assume the burner is broken:

Natural gas equipment fed propane: huge, roaring yellow flames, heavy sooting, flames lifting off the burner — a real hazard, shut it down.
Propane equipment fed natural gas: small, lazy, hard-to-ignite flames and equipment that never reaches temperature.
Healthy flame (either fuel, correctly set): mostly blue, stable, quiet, with crisp inner cones.

A clean-looking blue flame after conversion, confirmed by a technician's manometer reading at the manifold, is the real proof the job was done right. Also note that at high altitude, burners may need de-rating regardless of fuel — another reason conversions belong with a qualified tech.

Tip: When you buy used or move equipment between sites, always ask which fuel it's currently set for. A range set for propane will misbehave on natural gas until it's converted — a quick, inexpensive fix if you know to ask.

Frequently asked

Can you convert propane equipment to natural gas?

Usually yes. Most commercial gas appliances are field-convertible with a manufacturer conversion kit that swaps the burner orifices and adjusts the regulator pressure. A licensed gas technician should do the work and verify manifold pressure and flame. A few appliances are not convertible, so check the model first.

Is propane hotter than natural gas?

Per cubic foot, propane carries far more energy, about 2,500 BTU versus roughly 1,000 BTU for natural gas. But a properly converted appliance delivers the same total BTU output on either fuel because the orifice size and regulator are matched to the gas. The flame temperature at the burner is similar when set up correctly.

Why do gas appliances need different orifices for propane and natural gas?

Propane is delivered at higher pressure and packs more energy per cubic foot, so it needs a smaller metering hole to deliver the right amount of heat. Natural gas is lower pressure and lower energy, so it needs a larger hole. Using the wrong orifice produces flames that are either dangerously large or too weak.

Do you need a professional to convert gas equipment?

Yes. Converting involves changing orifices, resetting the pressure regulator, and verifying manifold pressure with a manometer, plus a leak check. It should be done by a licensed gas technician using the correct kit, both for safety and to keep the warranty and inspection records valid.

Which is cheaper, natural gas or propane?

Where a natural gas line is available, natural gas is typically cheaper per BTU and never runs out during service. Propane costs more per BTU but is the practical choice where there is no gas main, for food trucks and mobile setups, and as a backup fuel.