Moving a commercial oven from one fuel to another is a common job when a restaurant relocates, changes its gas supply or buys equipment that shipped set up for propane. An Atosa gas conversion is a simple, well-defined process when you have the right kit and take it one step at a time.

This guide walks through how an Atosa ATO-6B oven is converted from propane (LP) to natural gas (NG). It covers the parts that change, the tools to prepare, safety rules, common mistakes and daily care afterward.

Note: This article is a general guide. Always follow the manufacturer's instructions and the conversion kit instructions for your exact model.

What Is an Atosa Gas Conversion?

A gas conversion changes the parts inside an appliance so it can burn a different fuel safely. Propane and natural gas are not interchangeable. They are delivered at different pressures and need different amounts of fuel at the burner to produce a correct flame.

Because of that, the appliance must be fitted with parts made for the fuel you are using. In an Atosa oven, an LP to NG conversion generally involves four things:

• The gas regulator
• The burner orifices on the cooktop
• The orifice for the oven burner
• The pilot assembly

Each of these is included in the official conversion kit for the model, so you should not need to buy loose parts.

Why Convert LP to NG?

There are several practical reasons operators choose to convert:

• Gas supply: Many commercial kitchens in cities have natural gas piped in, and it is often cheaper to run than bottled propane.
• Relocation: An oven that worked at a previous site on propane may need to run on natural gas at the new one.
• Convenience: Piped gas removes the need to swap or refill tanks during service.
• Equipment flexibility: Buying one model and converting it can be easier than sourcing a different version.

If you are still planning your kitchen, browse the commercial gas ranges collection to compare sizes and fuel options before you buy.

LP vs NG: What Changes Inside the Oven

The table below summarizes the main differences. It is a general overview. Your kit and your manual give the exact specifications.

The key idea is that the orifice size controls how much gas reaches the burner. The orifice size in the pilot assembly controls the size of the pilot flame.

Before You Start: Preparation and Tools

A conversion goes faster when everything is laid out before you begin. Check these items first:

• The correct Atosa conversion kit for your model
• The manufacturer's instruction sheet that comes with the kit
• Screwdrivers and a wrench set that fit the regulator and orifices
• Pipe thread sealant approved for gas, if your instructions call for it
• A soap and water solution for leak testing
• A flashlight and a clean cloth
• A small container to hold the removed parts

Confirm that the oven is cool, disconnected from power if it uses any, and that the gas supply is turned off at the shut-off valve. If your unit is part of a multi-oven setup, plan to repeat the steps for each oven.

Safety Tips for Gas Conversion

Gas work leaves no room for shortcuts. Keep these rules in mind from start to finish:

• Shut off the gas at the supply valve before touching any part.
• Let the oven cool completely. Burners and metal surfaces can stay hot for a long time.
• Ventilate the area and keep open flames away from the work area.
• Wear gloves to protect your hands from sharp metal edges.
• Use a helper when sliding out or lifting heavy parts such as the oven floor.
• Follow local codes. Many areas require a licensed gas technician for this type of work.
• Never skip the leak test once you are done.

If you smell gas at any point, stop, ventilate the room, leave the area and contact your gas provider or a qualified technician.

Step-by-Step: How to Convert an Atosa ATO-6B from LP to NG

The walkthrough below follows the order used in the video demonstration. Remember that exact steps can vary by model.

Step 1: Replace the Gas Regulator

Start with the regulator. The existing LP regulator is removed and the natural gas regulator from the kit is installed in its place. In the demonstration, the new regulator screws directly onto the gas pipe.

Make sure the threads are clean and that the regulator is tightened securely but not over-tightened. Check your instructions to see whether sealant is recommended on the threads.

Step 2: Access the Burner Orifices

Next, reach the cooktop burner orifices. Remove the control knobs, then take off the front plate that covers the gas manifold. This exposes the orifices that feed each burner.

Set the knobs and screws aside in a container so nothing gets lost.

Step 3: Replace the Burner Orifices

Replace the six burner orifices with the new ones provided in the kit. The video refers to the existing orifices on this unit as #45. Unscrew each old orifice carefully and install a new one in the same position.

Take your time here. Cross-threading an orifice can damage the fitting and cause a leak or a poor flame.

Step 4: Remove the Oven Floor

To reach the oven burner, remove the oven floor. It is pulled up and then slid out. This is a good moment to use a helper, because the part can be awkward and sharp at the edges.

With the floor out, you will see the oven burner and the pipe that feeds it.

Step 5: Replace the Oven Burner Orifice

Find the orifice located behind the oven burner pipe. Replace it with the short orifice supplied in the conversion kit. This part is different from the cooktop orifices, so do not mix them up.

Keep the old orifice with the other LP parts in case you ever need to convert back.

Step 6: Replace the Pilot Assembly

Finally, replace the pilot assembly. The entire assembly is swapped, because the orifice size is built into it and that size decides the size of the pilot flame. Do not try to reuse the old pilot.

Reconnect any tubing or fittings as shown in your instructions and secure the assembly in the same position as the original.

Step 7: Reassemble and Test

Reinstall the oven floor, the front plate and the control knobs. Turn the gas supply back on and check every connection with a soap and water solution. Bubbles mean a leak, and you must shut the gas off and fix it before continuing.

Once there are no leaks, light the pilot and burners according to your manual and confirm the flames look steady and correct. If you are unsure how to light the oven, our guide to range and oven pilot lighting shows the process.

Multiple Ovens and Other Atosa Models

The process is generally consistent across Atosa models. If your equipment has more than one oven, the same steps are simply repeated for each oven. Count the burners, orifices and pilots on your unit before you start so you know how many parts you need.

Not sure which parts your model needs? Browse the Atosa parts collection or the broader cooking equipment parts and accessories page.

Common Mistakes to Avoid

Most conversion problems come from a small number of mistakes. Watch out for these:

1. Skipping the kit instructions. Every model is slightly different, so never rely on memory.
2. Mixing up orifices. The cooktop orifices and the oven burner orifice are not the same part.
3. Reusing the old pilot assembly. The pilot is replaced as a whole because its orifice size sets the flame.
4. Cross-threading parts. Start every thread by hand before using a tool.
5. Forgetting the leak test. A quick soap test can prevent a serious problem.
6. Ignoring local rules. Some jurisdictions require a licensed technician and an inspection.
7. Losing small parts. Keep screws, knobs and the old orifices together in one container.

Daily Use and Tips After Conversion

After the work is done, watch how the oven behaves during the first few days. A few simple habits help:

• Check that burner flames are steady and mostly blue rather than yellow or lazy.
• Make sure the pilot stays lit when you start up each morning.
• Listen for popping or unusual sounds when burners ignite.
• Keep the area around the oven clear for good airflow.
• Label the unit as natural gas so staff and future technicians know the fuel type.

If anything looks wrong, turn off the gas and call a qualified technician rather than adjusting things by trial and error.

Maintenance and Care

A converted oven needs the same regular care as any other commercial cooking equipment:

• Wipe spills and grease from burners and the oven floor so they do not clog ports.
• Inspect orifices and the pilot for dirt or blockage during routine cleaning.
• Re-check gas connections for leaks after any move or service.
• Schedule periodic professional inspections to keep the oven running safely.
• Store the old LP parts in a labeled bag in case the oven ever needs to go back to propane.

Keeping spare parts on hand also reduces downtime. Our article on stocking up on OEM parts from Atosa and other brands explains why genuine parts are worth having in your storeroom.

Related Products and Guides

Related guides

• Range and oven pilot lighting
• How to properly light an Atosa ATFS gas fryer
• How to uncrate Atosa products
• Lighting a Pitco fryer pilot safely
• Atosa fryers: efficiency and performance breakdown
• OEM parts from Atosa, UNOX, True, Turbo Air and AMPTO

Related products and collections

• Atosa parts
• Commercial gas ranges
• Cooking equipment parts and accessories
• Atosa AGR-36G 36" gas range with griddle top
• Atosa AGR-2B24GR gas range
• Atosa AGR-2B24GL 36" combination gas range

Frequently Asked Questions

Can I convert an Atosa oven from LP to NG myself?

Some operators do, but gas work carries real risk. Many locations require a licensed technician, so check your local rules and your warranty terms first. If you are not fully comfortable, hire a professional.

What parts are included in an Atosa conversion kit?

The kit supplies the parts that change with the fuel: the natural gas regulator, the burner orifices, the short orifice for the oven burner and the replacement pilot assembly. Check the contents against your kit instructions before you begin.

Do I need to convert each oven separately?

Yes. If a unit has multiple ovens, the steps are repeated for each oven. Make sure you have enough orifices and pilot assemblies for all of them.

How do I know if there is a gas leak after conversion?

Brush a soap and water solution over each connection with the gas on. Bubbles indicate a leak. If you see bubbles or smell gas, turn off the supply and fix the connection before using the oven.

Can I convert the oven back to propane later?

In most cases a conversion can be reversed with the correct LP kit for the model. Keep the original parts labeled and stored together so they are easy to find.

Why does the pilot assembly need to be replaced?

The pilot assembly contains an orifice whose size controls the pilot flame. Natural gas needs a different size than propane, so the entire assembly is replaced instead of adjusted.

Is the conversion process the same for every Atosa model?

The process is generally consistent across Atosa models, but details like the number of orifices and the access panels can differ. Always follow the instructions for your exact model.

Final Thoughts

An Atosa gas conversion from LP to NG comes down to four parts: the regulator, the cooktop orifices, the oven burner orifice and the pilot assembly. Work in order, keep your parts organized, respect gas safety rules and finish with a careful leak test.

If you need parts, equipment or advice, the team at Amechef is ready to help you choose the right products for your kitchen.

Want to see the process in action? Watch the original video from https://www.youtube.com/watch?v=Vde7xmjU5Hk