How to Convert Natural Gas Range to Propane – Easy DIY Guide

So, you're looking to convert your natural gas range to use propane. The process itself boils down to two key tasks: swapping out the existing gas orifices for smaller ones and adjusting the pressure regulator. This isn't just a recommendation; it's a critical step to make sure the appliance can safely handle propane's higher pressure and energy content, preventing dangerous flare-ups and the risk of carbon monoxide.

Getting this right requires the correct conversion kit for your specific range model and a bit of know-how.

Why This Conversion Is a Non-Negotiable Safety Step

Before you even grab a wrench, let's be clear: this isn't a simple "plug-and-play" swap. Natural gas and propane are fundamentally different fuels, and treating them like they're the same is a recipe for disaster. The whole point of converting your natural gas range to propane is to manage these differences safely.

If you hook up a natural gas stove directly to a propane line without converting it, you’ll get massive, out-of-control flames. You'll also see a lot of black soot and, most dangerously, create a serious risk of carbon monoxide poisoning. This is a critical safety procedure, not a minor tweak.

A Tale of Two Fuels

The "why" behind this conversion comes down to two things: energy density and pressure. They behave very differently, which is why your appliance needs to be set up just right for the fuel you're using.

To put it simply, propane packs a much bigger punch. It's a hotter-burning fuel. Take a look at this quick comparison:

Natural Gas vs Propane At a Glance

As you can see, propane is more than twice as energy-dense. This means you need a lot less of it to get the same amount of heat.

Natural gas orifices have larger openings designed to let more of the lower-energy fuel through. If you try to force highly concentrated propane through those same big openings, you get a huge, sooty, and dangerous flame. It's like trying to drink from a fire hose.

The Main Goal: The entire point of the conversion is to restrict the fuel flow to account for propane's higher energy. We do this by installing orifices with much smaller holes, which is the heart of the conversion process.

Pressure, Regulators, and Keeping Things Safe

On top of the energy difference, the delivery pressure for these gases is worlds apart. Propane systems run at a much higher pressure—typically around 10 to 11 water column inches—compared to the gentle 3 to 4 inches for natural gas.

Your range has an internal regulator designed to manage a specific incoming pressure. If you don't adjust it from the 'NAT' (Natural Gas) setting to 'LP' (Liquid Propane), it won't be able to control the flow correctly, which creates an incredibly unsafe situation.

This one-two punch of higher pressure and higher energy density is exactly why using the right conversion kit and following the procedure is absolutely mandatory. For a more detailed breakdown of these differences, you can learn more about natural gas vs propane in our comprehensive guide.

Getting Your Tools and Conversion Kit Together

Before you even think about touching the gas line, a little prep work goes a long way. Having the right tools and the exact conversion kit laid out and ready to go is what separates a smooth, successful project from a frustrating afternoon of trips to the hardware store. Trust me, this isn't a job where you can just wing it—the right parts are non-negotiable for safety.

The first, and most critical, step is finding the correct propane conversion kit for your specific appliance. These kits are absolutely not a one-size-fits-all deal. Each one is engineered for a particular range of models from a single manufacturer. If you grab the wrong one, you'll end up with improperly sized orifices, which makes the whole conversion pointless and, more importantly, creates a serious safety risk.

Finding Your Range's Model Number

To get the right kit, you need to know your range's exact model and serial number. This info is almost always on a small metal plate or sticker tag somewhere on the appliance.

You’ll usually find it in one of these spots:

• Just inside the oven door frame.
• Behind the bottom storage or broiler drawer, on the frame itself.
• On the back of the range, often near the gas line connection.

With that number in hand, you can order the correct kit directly from the manufacturer or a certified parts dealer. It’ll come with all the properly sized brass orifices you need for both the cooktop burners and the oven.

The Tools You'll Need

Once you've got the kit, it's time to gather your tools. The good news is that you probably have most of what you need already. Having them all within arm's reach is key, especially since you'll be dealing with small parts in some pretty tight spaces.

Here’s a quick checklist of the essentials:

• Nut Driver Set: A 7mm nut driver is usually the go-to for swapping cooktop orifices. It’s smart to have a full set on hand, though, as sizes can differ. A magnetic tip is a real game-changer here—it keeps those tiny brass orifices from vanishing into the depths of your appliance.
• Adjustable Wrench: You'll need this for the main gas supply line.
• Needle-Nose Pliers: Perfect for grabbing and placing small parts where your fingers can't reach.
• Gas-Rated Thread Sealant: This is crucial. You have to use a pipe thread sealant (it's usually a yellow paste or tape) that is specifically rated for gas fittings to guarantee a leak-proof connection.

My Two Cents: Before you begin, lay a towel down on the counter or floor. It gives you a dedicated spot for your tools and parts, prevents scratches, and stops those tiny, crucial pieces from rolling away and disappearing forever.

Getting prepared is more than half the battle when converting a gas range. It’s all about ensuring the job is done safely and efficiently. This same mindset applies to your gas line connections. For a deeper dive, check out this comprehensive https://therestaurantwarehouse.com/blogs/restaurant-equipment/gas-hose-guide to make sure every connection you make is the right one.

Swapping Out the Cooktop and Oven Orifices

Alright, let's get to the heart of the matter: changing the small brass orifices that control the fuel flow to each burner. This is the most hands-on part of converting your natural gas range to propane, but it’s completely doable with a little patience. I always start with the cooktop burners—they’re the easiest to get to.

First things first, clear your workspace. Lift off the heavy cooking grates, then remove the burner caps (the flat metal discs) and the burner heads they sit on. Once you do that, you'll see the burner base, and looking down into the center, you’ll spot a small, hexagonal brass fitting. That’s the natural gas orifice, and it’s coming out.

Dealing with the Cooktop Burners

A magnetic nut driver is your absolute best friend for this part. I can't tell you how many times I've seen someone drop a tiny orifice down into the guts of a stove—it's a real pain. A 7mm magnetic driver is usually the perfect size. Just place it over the orifice, give it a counter-clockwise turn to loosen, and lift it straight out.

With the old one out, grab a new propane orifice from your conversion kit. Look closely; each one should be stamped or labeled with a number that tells you which burner it belongs to (like front-right or rear-left). It’s absolutely critical to match the right orifice to the right burner based on the kit's instructions. Getting this wrong will lead to uneven flames and poor performance.

My Two Cents: Go easy when you tighten the new orifices. They’re made of soft brass and you can strip the threads or crack them if you go full-on gorilla mode. You just want it to be snug and secure, not cranked down with all your might.

This diagram lays out the physical steps you're taking.

As you can see, it's a three-part physical process. You have to get all the right hardware in place before you even think about adjusting the pressure.

After you’ve replaced all the orifices on the cooktop, go ahead and put the burner heads, caps, and grates back on. Now, take a deep breath, because we're moving on to the trickier part: the oven and broiler.

Getting to the Oven and Broiler Orifices

The oven and broiler orifices are almost always hidden away and a real pain to access. Their exact location can vary wildly between different makes and models, which is why having that manufacturer's manual nearby is non-negotiable. On most ranges, you'll need to pull out the oven's bottom panel to get started.

• Open the oven door all the way and take out the racks.
• Find the screws or clips holding the bottom panel down. Remove them.
• Carefully lift the panel out. This should expose the main oven burner tube running along the bottom.

The oven orifice is usually at the very back of the oven, right where the burner tube connects to the gas supply valve. You'll likely need an adjustable wrench for this one. The broiler orifice is a similar story, but it could be at the top of the oven or in a separate drawer underneath.

Get ready for some tight squeezes and awkward angles. A good pair of needle-nose pliers can be a lifesaver here for getting the new orifice started in the threads. Since this part of the job is more involved, knowing the ins and outs of your stove is key. For a deeper dive into different gas stove setups, our detailed propane gas stove guide can give you some great background info.

Once you’ve successfully installed all the new, smaller propane orifices, you're officially over the biggest hurdle. The range is now physically equipped to burn the hotter, higher-pressure propane fuel.

Fine-Tuning the Pressure Regulator and Air Shutters

Now that you've installed the smaller propane orifices, you've taken care of the fuel flow. But that's only half the battle. Next up, we need to tackle the pressure and the all-important air-to-fuel mixture. This part involves two crucial adjustments that teach your range how to burn its new, hotter fuel source safely and efficiently.

First on the list is the pressure regulator. Think of this little component as the bouncer at the door, controlling the gas pressure before it ever reaches the burners. Propane is supplied at a much higher pressure than natural gas, so you have to tell the regulator to step things down. If you skip this, you’re looking at dangerously high flames—a serious safety hazard.

Switching the Regulator to LP Mode

You'll usually find the pressure regulator on the back of the range, right where the main gas line hooks up. Look for a hexagonal cap, which might be metal or plastic. Your mission is to switch this from the 'NAT' (Natural Gas) setting to 'LP' (Liquid Propane).

It's a surprisingly simple process:

• Grab a wrench or pliers and unscrew the cap. It shouldn't be on there excessively tight.
• Once you have it off, look at the underside. You’ll see a small pin or insert attached.
• This little piece is the key. One side is marked 'NAT' and the other is marked 'LP'.
• Just pull the insert out, flip it over so the 'LP' side faces out, and pop it back into the cap.
• Screw the cap back onto the regulator and tighten it until it's snug.

And that's it. This tiny flip changes the internal spring tension, making sure the regulator sends propane to the burners at the correct, lower pressure.

It's a small adjustment with a huge impact. This single step is absolutely critical for a safe propane conversion. Without it, the new, smaller orifices would be overwhelmed by high pressure, completely defeating the purpose of swapping them out in the first place.

Dialing in the Perfect Blue Flame

With the pressure handled, the last piece of the puzzle is to fine-tune the air-to-fuel ratio. You do this by adjusting the burner air shutters. Propane needs a different amount of oxygen than natural gas to burn cleanly, and this adjustment is all about getting that perfect, steady blue flame.

The air shutters are small, movable metal collars at the base of each burner tube, near the gas valve. You'll need to find and loosen a small set screw to be able to turn them.

Go ahead and turn on a burner to a medium setting and take a close look at the flame. Here’s what you’re watching for and how to fix it:

• A Noisy, "Lifting" Flame: If the flame jumps off the burner and makes a loud "whooshing" sound, it’s getting too much air. You’ll want to close the shutter a bit to restrict the airflow.
• A Sooty, Yellow Flame: If the flame is mostly yellow or orange and you can imagine it leaving soot on your pots, it’s starving for air. Open the shutter to let more oxygen into the mix.
• The Ideal Flame: Your goal is a quiet, stable flame that is almost entirely blue. A tiny flicker of yellow right at the tip is perfectly normal.

Make small, careful adjustments to each shutter until every single burner produces that ideal flame. Don't forget about the oven and broiler burners! They often have their own air shutters that need the same treatment.

This final touch ensures your range burns propane cleanly and efficiently, giving you all the heating power you paid for. Speaking of power, propane contains roughly twice the energy of natural gas per cubic foot, so a properly tuned flame lets you get the most out of every bit. You can learn more about the efficiency benefits of propane on patriotpropane.com.

The Final Check: Hunting for Leaks and Perfecting the Flame

Alright, the mechanical work is done. You've swapped out the orifices and tweaked the regulator. But we're not finished yet. In fact, what comes next is the most critical part of this whole job: the safety and leak check.

Don't even think about rushing this. I can't stress this enough. Taking an extra ten minutes here is what separates a safe, professional job from a potential disaster. The peace of mind you get from knowing every connection is rock-solid is well worth the effort.

The Old-School Soap and Water Test

You don't need any high-tech gadgets for this. The most reliable way to find a gas leak is still the classic soap and water method. It's simple, foolproof, and far safer than trying to use your nose or, even worse, a flame to find a leak.

Just mix up a 50/50 solution of dish soap and water. A spray bottle works great, but a small bowl and a little paintbrush or even just your fingers will do the trick. The goal is to get a nice, bubbly mixture.

Now, you're going on a hunt. Apply this soapy solution to every single spot you worked on. Be thorough.

• The main gas line connection behind the stove.
• The fitting that connects the gas line to the pressure regulator.
• The base of every single cooktop orifice you installed.
• Any connections you touched for the oven and broiler orifices.

Coat them all generously. Once everything is soapy, turn the main gas supply back on and watch each connection like a hawk.

What you're looking for are bubbles. If you see them forming, growing, or expanding at any connection, that's a leak. Immediately shut off the gas. Go back and tighten that specific fitting—usually just another quarter-turn does it—then apply the soapy water and test it again. Do not move on until every connection is completely bubble-free.

Last Look: Firing It Up and Checking the Flames

Once you're 100% certain there are no leaks, it's time for the moment of truth. Let's see how well those adjustments worked. This final check confirms your range is burning propane cleanly and efficiently.

Fire up each cooktop burner, one by one. Let it run for a minute and really look at the flame. What you want to see is a steady, quiet, blue flame. A tiny little yellow or orange tip is perfectly fine, but the body of the flame should be a crisp blue.

If a flame is lifting off the burner, making a roaring noise, or is mostly yellow, you need to revisit the air shutter for that specific burner. Turn it off, let things cool down, and make a small adjustment.

Finally, give the oven and broiler the same treatment. Set the oven to preheat and, if you can, peek at the burner flame through any access panels or openings. It should look just like the cooktop flames—clean and blue. Do the same for the broiler.

When every burner on the cooktop, in the oven, and in the broiler lights up with a perfect blue flame and every connection has passed the soap test, you can officially call this job a success. You've safely and correctly converted your range to run on propane.

Got Questions About Your Propane Conversion?

Even after you've read the instructions cover to cover, a few questions can pop up when you're in the middle of a natural gas to propane conversion. It happens to everyone. Let's tackle some of the most common ones I hear from people doing this for the first time.

Can I Just Drill Out My Old Orifices?

I get this question a lot, and the answer is a hard no. Never, ever try to drill out or modify your old natural gas orifices to fit propane.

It might seem like a simple way to save a step, but you'll never get the precision of a factory-drilled part. That tiny hole is engineered to a specific size for a reason—to safely control the flow of propane. Getting it wrong is a serious fire hazard. Always use the new orifices that came in your kit.

Do I Need a Brand New Gas Hose?

This one depends. If your current flexible gas line is in good shape and officially rated for both natural gas and propane, you can probably reuse it.

However, give it a good look first. If you see any kinks, cracks, or signs of aging, just replace it. A new hose is a cheap, easy-to-install piece of safety insurance.

Is Every Gas Range Convertible?

Most modern gas ranges are built with conversion in mind, but not all of them are. Don't just assume yours is.

The final word is always in your owner's manual or on the manufacturer's spec sheet. If it says the range can't be converted, believe it. Forcing a conversion on a non-convertible unit is asking for trouble.

The good news is that these days, appliance manufacturers make it pretty straightforward. They provide complete kits with the right orifices, regulators, and step-by-step instructions. Decades of safety standards have formalized the specs for gas pressures and orifice sizing, which has taken a lot of the guesswork and danger out of the process. You can find some great background on these safety standards for stove conversions on desiredcreations.com.

What if My Flame Isn't Perfectly Blue?

Don't panic if you see a tiny bit of yellow or orange flickering right at the tip of the flame—that’s perfectly normal.

What you're watching out for is a consistently yellow, lazy-looking flame. That's a clear sign your air-to-fuel mix is off. If you see that, you'll need to go back and fine-tune the air shutter adjustment for that burner until it burns clean and blue.

Whether you're building out a food truck or setting up a new restaurant kitchen, The Restaurant Warehouse has the tough, reliable cooking equipment you need to get the job done right. Check out our complete lineup of commercial ranges, fryers, and more at https://therestaurantwarehouse.com.