Ooni Natural Gas Conversion Guide: Kits & Setup (2026)

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Only five Ooni ovens can run on natural gas, and no two of them get there the same way. The current gas lineup splits into a single official conversion kit, one dedicated natural-gas burner, and two ovens that have to be ordered as gas-line versions from the factory — while every other model in the range, including several widely described online as convertible, has no supported natural-gas path at all.

That ambiguity gets expensive fast. Buy the wrong kit and you own a part that physically will not couple to your burner housing; drill an orifice instead and you have modified a certified gas appliance. Ooni's own naming makes the problem worse: the accessory catalog includes a product literally called a Gas Burner that is bottled propane only, and European searches for an Ooni "gas burner" mostly surface LPG hardware at 30, 37 or 50 mbar rather than natural-gas parts.

This guide maps the routes precisely — which oven takes which part, what is inside the box, what the house-side connection actually requires, the manufacturer's own installation and leak-test sequences, and the model, generation and regional limits that decide whether a conversion is possible at all.

It is written for owners of an existing Ooni who already have a natural-gas stub or outdoor kitchen line, and for buyers deciding between a propane oven and a factory gas-line version. If the oven itself is still open, start with the Ooni vs Gozney vs Blackstone comparison.

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Ooni Koda 16 Natural Gas Conversion Kit

The Koda 16 kit is the only true field conversion in Ooni's range, and the most frequently mis-sold part in the category: it fits the Koda 16 and nothing else. Not the Koda 12, not the Koda 2, not the Koda 2 Pro, not the Koda 2 Max. The Koda 16 itself is classified by Ooni as a 1st Generation model and remains directly listed and sold — repositioned in the lineup, not withdrawn.

In the box: the natural-gas hose, a quick connector, the natural-gas nozzles, an NG control-dial collar, a hex wrench, a screwdriver and the illustrated instruction manual. No thread sealant is listed among the supplied contents.

Regional limit. The North American kit is specified for the 28 mbar, USA-market Koda 16. European Koda 16 listings are configured around their own country's propane or butane pressure — 30, 37 or 50 mbar depending on market — and this kit is not the conversion route for those ovens.

Use the manual that came in your box, not a number from a forum. The Koda 16 conversion has documented revision differences. An older official revision specifies 1.75 mm natural-gas nozzles against 1.11 mm propane nozzles, a 14 mm nozzle-housing wrench and a valve adjustment of 5–7 counter-clockwise turns. Later documentation specifies a 12 mm wrench and a materially different adjustment count. No public changelog maps serial ranges to procedures, which is exactly why the shipped manual governs the job.

Warranty on the conversion: the kit and hose carry two years, and the oven itself can reach five years when registered within the qualifying window.

Check the current price of the Ooni Koda 16 Natural Gas Conversion Kit on Amazon

Natural Gas Burner for Karu 16 and Karu 2 Pro

The Karu route is mechanically simpler than the Koda 16 conversion because there is no nozzle surgery at all — you replace the burner rather than re-jetting it.

Some shipments still arrive in old Karu 16 packaging even though the current part also fits the Karu 2 Pro. The box will not tell you which ovens it serves — the part number will. UU-P24B00 is the current SKU; UU-P0F200 is the older distributor number that still circulates on used and clearance listings, and buyers frequently ask how the two revisions differ before committing.

The rating plate beats the storefront figure. Ooni's product page lists the burner at 8 kW / 27,297 BTU/h. The certified manual and rating plate for the documented revision of this burner specify 25,000 BTU/h, a 1.8 mm main burner orifice, a burner pressure of 1 kPa and a supplied-regulator outlet of 4 in. w.c. When you are matching the burner against a gas line, the plate is the figure that describes the hardware in the box.

Two installation constraints come straight from the manual: use only the supplied pressure regulator and hose, and keep the chimney installed and open while the natural-gas burner is running. The burner body can reach five years of coverage under Ooni's extended terms, with the regulator and hose at two years.

Check the Natural Gas Burner for Ooni Karu 16 and Karu 2 Pro on Amazon

Karu 12, Karu 12G and Karu 2: The Propane-Only Trap

Some of the highest-volume "Ooni gas conversion" searches land on the Gas Burner for the Karu 12 and Karu 2. None of them end in natural gas.

The current attachment fits the Karu 12 and the Karu 12G/Karu 2 only, runs on bottled propane, and outputs 5.3 kW — Ooni claims roughly 850°F in 25 minutes from it. The U.S. box contains the burner, an 11 in. w.c. / 28 mbar propane regulator and hose, two 10 mm screws, an Allen key, an extendable match holder and the manual. Operating configuration differs by oven: the Karu 12 requires the door off and the chimney on with this burner, while the Karu 12G and Karu 2 can run with the glass door closed. Ooni states plainly that it cannot guarantee or provide warranty coverage when the burner is used with ovens other than the designated Karu models.

Karu 12G and Karu 2 are the same oven under an old and a new name, which is why accessory titles, packaging and retail listings mix both designations — useful to know when you are matching a used burner to a used oven.

Historical part numbers add a second layer of confusion. The Karu 12 burner has been catalogued under UU-P0EA00, and the older Ooni 3 Gas Conversion Kit carried UU-P05700. That second product has "conversion kit" in its name and is still regularly mistaken for a natural-gas part in the used market. It was propane. Neither number is a gas-line route.

For Karu 12, Karu 12G and Karu 2 owners who simply want to stop managing solid fuel, the propane attachment is the route that exists: Gas Burner for Ooni Karu 12 and Karu 2. It will not put the oven on a gas line.

Koda 2 Pro and Koda 2 Max: Factory Natural Gas, Not Conversions

Both current large-format Koda ovens carry a fuel selector on Ooni's U.S. and Canadian stores — Propane (Tank) or Natural Gas (Gas Line). That selector is a factory configuration, not the promise of a future retrofit. No official propane-to-natural-gas kit exists for either oven.

The Koda 2 Pro is an 18-inch gas oven with a 950°F maximum advertised temperature and a 60-second pizza claim, sold with the Ooni Connect temperature hub and food probe. The Koda 2 Max is the 24-inch dual-zone flagship: two independently controlled burner zones, capacity for one 20-inch New York-style pie, two 12-inch pizzas or three 10-inch pizzas, and a 210–950°F operating range. Both factory fuel versions ship with the appropriate hose and pressure regulator.

For the documented certified natural-gas revision of the Koda 2 Max, the rating plate specifies 35,000 BTU/h, two 2.40 mm natural-gas orifices and a 4 in. w.c. inlet and regulator pressure, using the supplied natural-gas regulator. Newer U.S. retail listings for the gas-line model carry a different SKU than that certified revision, and no public bulletin documents the supersession — so on a factory NG oven, the rating plate on the unit is the specification that counts, not a figure copied from a product page.

Regional block. ANZ versions of both the Koda 2 Pro and the Koda 2 Max are LPG-only, and Ooni states they are not suitable for natural-gas connection or conversion. European product pages are configured around country-specific propane pressures rather than the U.S. natural-gas specification. A gas-line Koda 2 Max existing in the U.S. does not make an Australian unit convertible — the fuel configuration is market- and model-specific at the factory.

The "buy propane now, convert later" plan does not work here. Ooni's own guidance is that the propane and natural-gas versions of these ovens are separate configurations rather than something an owner switches between after purchase. If a permanent gas line is in your future, order the gas-line version at checkout.

Check the Ooni Koda 2 Max lineup on Amazon

The House Side: Pressure, Pipe Sizing and the 3/8-Inch Trap

Every conversion in this guide ends at a 3/8" NPT male termination, and that figure is the single most misread number in the whole job. It describes the appliance connection requirement. It is not an instruction to run a 3/8-inch branch from the meter.

Building pipe diameter is determined from supply pressure, allowable pressure drop, pipe material, equivalent run length and total connected demand — all of them together. The 2024 IFGC capacity tables work exactly that way. A worked example from the code: at a 60-foot design length and a 0.5 in. w.c. allowable drop, a 35 cfh outlet is served by 1/2-inch pipe, a 75 cfh outlet needs 3/4-inch, and a combined 110 cfh section needs 3/4-inch. None of those are Ooni-specific prescriptions; they illustrate why connector size alone tells you nothing about whether the run is adequate.

What each Ooni NG appliance actually requires at the connection:

A grill stub can work — if it is sized for it. An existing BBQ outlet is a legitimate supply point when it has adequate capacity and the correct shut-off and quick-disconnect arrangement. What it will not do is gain capacity from a splitter: the branch upstream of the split still has to carry the combined demand of the oven and everything else drawing from it, and long runs, restrictive disconnects and undersized patio branches starve a burner even when every fitting threads together cleanly. If there is no outdoor gas stub, the correct path is a qualified local gas professional sizing and installing the branch, outlet and shut-off — not an indoor appliance hose run out through a window.

The propane regulator must not be reused. Propane and natural-gas systems are built around different pressure and metering requirements, and the original propane regulator is part of the propane-certified fuel system. Substituting natural gas downstream of it does not turn it into a natural-gas regulator. The reverse error is just as common: natural gas does not mean "no regulator." The Karu natural-gas burner requires its own supplied regulator, and the Koda 2 Max gas-line version ships with the appropriate hardware.

The orifice change is the engineering behind that rule. The historical Koda 16 conversion revision labels its propane nozzle at 1.11 mm and its natural-gas nozzle at 1.75 mm. The Karu natural-gas burner rating plate identifies a 1.8 mm orifice. Those values are model- and revision-specific metering specifications, not drill sizes.

On sealant: Ooni's kit contents list no thread sealant at all. Tapered NPT joints and flare or quick-disconnect sealing surfaces are fundamentally different connection types, and fixed-piping assembly belongs to the fitting manufacturer's instructions and the locally adopted fuel-gas code.

Who Is Legally Allowed to Do the Work

There is no accurate nationwide U.S. rule that says homeowners may always convert an oven, and none that says a licensed plumber is always required. NFPA 54 and the IFGC are model standards adopted and amended jurisdiction by jurisdiction, and permit and homeowner-exemption rules vary by state and local authority. The workable distinction is this: Ooni publishes owner-facing instructions for the Koda 16 appliance conversion, while fixed building gas work — new branch piping, regulators, shut-offs, pressure testing, new exterior outlets — has to satisfy the locally adopted code and whatever permitting and licensing rules your authority enforces. Ooni independently recommends consulting a local gas engineer, and local code may require a quarter-turn shut-off valve at the appliance.

The United Kingdom is stricter. GOV.UK requires that any person or business carrying out gas work on gas fittings be on the Gas Safe Register, and competence and scope of registration both matter — generic DIY guidance written for the U.S. market does not transfer.

Europe has no single rule set either. France illustrates the mismatch cleanly: the standard residential outdoor natural-gas outlet is designed around 20/25 mbar, an automatic shut-off, a maximum of 15 kW and a 2-metre stainless flexible connection, is specified for installation by a gas professional, and normally requires conformity documentation for the new outlet. A U.S. 3/8-inch NPT, 7 in. w.c. Ooni specification is not a European installation recipe.

Airflow matters as much as gas supply once the oven is running — if the oven sits under a roof or against a wall, the chimney and ventilation guide covers the clearances that keep combustion clean.

What You'll Need Before You Start

• The correct kit or burner for your exact model and generation — verify against the compatibility matrix above before ordering.
• Wrenches matching the job: 19 mm (3/4") and 12 mm (1/2") plus a Phillips screwdriver for the Koda 16; suitable wrenches for the Karu burner hose and regulator assembly.
• A protected, non-marring work surface. The Koda 16 gets inverted onto it, stone removed, legs folded.
• Leak-detection solution — or one part liquid detergent to one part water, which is what Ooni's own manual specifies.
• A correctly prepared natural-gas supply with the right terminal, the right pressure, adequate capacity and an accessible shut-off.
• A qualified local gas professional for anything on the fixed-piping side of that termination.

How to Convert a Koda 16 to Natural Gas, Step by Step

This is the manufacturer's documented sequence. Revision-specific nozzle and valve settings must come from the manual shipped with your own kit — not from a forum post, and not from a different revision of the instructions.

1. Shut off and disconnect the propane source. Confirm all controls are off and the oven is completely cool.
2. Remove the baking stone, fold the legs, and place the oven inverted on a protected surface.
3. Disconnect the existing propane regulator and hose using the correct wrench.
4. Remove the control knob, the collar screws and the propane control-dial collar. Retain the propane hardware.
5. Remove the control-box fasteners. The documented revision uses 11 short screws plus one longer screw.
6. Remove the two nozzle housings using the wrench specified in your manual revision.
7. Remove the propane nozzle tips with the supplied hex tool. Do not force them and do not strip them.
8. Install the supplied natural-gas nozzles. Ooni's documented method is hand-tight, then approximately a quarter turn, with an explicit warning against over-tightening.
9. Reinstall the nozzle housings using the same hand-tight plus quarter-turn principle.
10. Adjust the burner valves exactly as your kit's own manual revision specifies. Published revisions differ materially on the adjustment count, so use the number that shipped with your hardware.
11. Reinstall the control box, the natural-gas collar and the knob.
12. Attach the supplied natural-gas hose at the oven — hand-tight plus roughly a quarter turn with the 19 mm wrench.
13. Return the oven upright and refit the stone.
14. Connect the hose and quick connector to a correctly prepared 3/8" NPT male supply delivering 7 in. w.c.
15. Leak-test the complete assembly before the first firing.

No numerical torque value in N·m or ft-lb is published for this conversion. Hand-tight plus a quarter turn, without over-tightening, is the manufacturer-specific answer.

Installing the Karu 16 / Karu 2 Pro Natural Gas Burner

The Karu installation is shorter because the burner arrives as a certified assembly. There is nothing to re-jet.

1. Confirm local natural-gas rules and verify the supply is correct for the appliance.
2. Attach the supplied hose and regulator assembly, using suitable wrenches where required.
3. Remove the chimney cap and leave the chimney and airflow configuration open as instructed.
4. Remove the solid-fuel tray and grate.
5. Remove the oven's rear draft plate or hatch.
6. Insert the natural-gas burner into the rear port.
7. Secure it with the supplied fastening system, without over-tightening.
8. Connect the quick disconnect to a correctly prepared 3/8" NPT male supply.
9. Leak-test the entire connected system.
10. To ignite: open the gas supply, then press and rotate the control slowly counter-clockwise. The ignition click arrives after roughly three seconds; continue holding the control for approximately five seconds after that.
11. Keep the required door and opening configuration, and stay clear of the oven during ignition.
12. If the burner does not light or the flame goes out, turn the gas off and wait five minutes before attempting to relight. The manual includes a match-holder backup lighting procedure.

Leak Testing and First Fire

Ooni's leak-test procedure is the same logic on both conversions. Mix one part liquid detergent with one part water. With the burner control OFF, turn the gas supply on and apply the solution to the gas connections. Growing bubbles indicate a leak: shut the supply off, correct the connection, and repeat the test.

A joint that keeps bubbling after correction means the appliance does not get fired. Turn everything off and contact Ooni or a service professional rather than repeating ignition attempts. Ooni instructs owners to test at installation and again before use or reconnection. Never leak-test with a flame.

If ignition is unreliable once the system is tight, check the sparker position — documented Karu guidance is approximately 2–3 mm from the burner cap.

Aftermarket "Universal" NG Kits and Drilled Jets

There is a whole category of cheap propane-to-natural-gas conversion kits sold for Blackstone 28-inch and 36-inch griddles — orifice-and-hose packages with a quick-connect, marketed with compatibility language that has nothing to do with Ooni. No Ooni model is certified for any of them.

The mechanics explain why. Blackstone itself restricts each of its own natural-gas kits to specific griddle models and requires the correct orifices for that kit, which is precisely the point: fuel conversion is a matched set of metering hardware, not a universal adapter. A third-party jet kit built for a different appliance's burner cannot establish compatibility with an Ooni burner, no matter how the fittings measure.

Drilling the existing jet falls into the same category. Ooni states that its products are not designed, tested or certified for unauthorized operating modifications, and that such modifications invalidate warranty coverage — and on a gas appliance the consequence is not only commercial. Changing the orifice changes fuel metering and combustion behaviour on a burner that was certified with specific values: 1.8 mm on the Karu natural-gas burner, 1.75 mm against 1.11 mm on the historical Koda 16 revision. Every Ooni model with a supported path already has a certified part available for it. The models without one do not have a safe workaround.

Troubleshooting an Ooni on Natural Gas

Ooni's own modification warning is worth reading literally: restricting Koda airflow can increase carbon monoxide production and create a sooty flame. Combustion air is part of the fuel system.

Frequently Asked Questions

Conclusion

The Ooni natural gas question has one clean answer per oven, and none of them are interchangeable. The Koda 16 takes a dedicated field conversion kit. The Karu 16 and Karu 2 Pro take a complete natural-gas burner assembly that replaces the fuel side entirely. The Koda 2 Pro and Koda 2 Max have to be bought as gas-line versions from the factory, because no retrofit kit exists. Everything else in the range — including the models most often reported as convertible — has no supported natural-gas path.

Get the part right first, then get the gas side right. The appliance end of every conversion terminates at a 3/8" NPT male connection with a specific pressure requirement, and neither figure tells you anything about whether your branch pipe is adequately sized. That is a question of load, run length and pressure drop, and it is the step where converted ovens most often underperform.

To keep going:

• Compare every current Ooni gas model side by side in the best gas and propane pizza oven guide.
• See how Ooni's fuel strategy sits against the competition in the Ooni vs Gozney vs Blackstone comparison.
• Decide whether replacing the oven is smarter than converting it with the used pizza oven buying guide.
• Weigh a gas line against wood, charcoal and pellets in the pizza oven fuel comparison.
• Check out the pizza oven temperature guide to hit your bake targets.

→ Check the current price of the Ooni Koda 16 Natural Gas Conversion Kit on Amazon