What Is an LG UltraHeat Burner? (Pot Sizing Guide)

An LG UltraHeat burner is a high-output gas burner found on many LG ranges. Some models are rated at 18,000 BTU per hour, or about 5.28 kW, but output varies by range. For best results, choose a pan with a base that covers the flame pattern, center it on the grate, and lower the heat if flames reach around its sides.

Why can one burner sear food well yet scorch a small pan’s handle or finish? The answer is often a mismatch between flame size and pan base, not a problem with the cookware itself. Knowing what “UltraHeat” means, and how to match a pot to the burner, helps you use the extra output with more control.

What Is an LG UltraHeat Burner?

UltraHeat is LG’s name for a high-output gas burner on many of its ranges. Its higher heat input can help bring a large pan to temperature or heat a large volume of food, but it does not set the pan’s temperature. The exact rating depends on the range model.

BTU/h means British thermal units of heat input per hour. It describes the burner’s rated fuel input, not how hot a pan will get or how fast it will heat. Burner setting, pan size, pan material, pan thickness, and the amount of food all affect the result.

Many LG ranges list an UltraHeat burner at 18,000 BTU/h, about 5.28 kW. Do not assume that rating applies to every LG range. Check the model-specific specifications or manual for your appliance.

The name also does not mean that every pot should go on UltraHeat. A small pan on a high-output flame may heat unevenly, while a broad, thick pan may need time to warm through. Match the pan’s base to the flame, then set the heat for the food.

Choose Cookware and Match Pan Size to the Burner

Pan sizing means matching the burner’s flame pattern to the flat base of the cookware, not simply comparing the burner to the pan’s top rim. As a practical starting point, use roughly 10–12-inch pans on UltraHeat, then confirm that the pan sits firmly on the grate and the flame stays beneath its base.

LG does not set one universal pot-diameter limit for every UltraHeat model. Burner and grate designs can differ, so treat the ranges below as a starting guide, not a model-specific rule. Measure the flat cooking base when you can: a pan’s rim diameter can be wider than the area that rests over the flame.

These are approximate pan diameters, not guaranteed fits. The pan must sit flat and stable on the grate. If a 12-inch pan has a much smaller flat base, judge the base against the flame rather than relying on the rim measurement.

Cookware materials. Gas-compatible cast iron, carbon steel, stainless steel, and copper-core cookware generally work on a gas range. Check the maker’s instructions for the specific pan, especially if it has a coated surface or special construction. “Copper-core” usually means copper is part of a layered pan; it does not mean the cooking surface is bare copper.

Pan material affects how quickly heat spreads and how long the pan holds it. Thin aluminum and copper spread heat quickly. Thick cast iron and many multi-ply pans take longer to warm, but their greater mass can help them hold heat. No material removes the need to control the flame.

Worked setup scenarios. In my cookware checks, I focus on the flame-to-base fit first, then the pan’s stability and the task at hand. These examples are practical setup cases, not tests of every LG model:

• A small saucepan on UltraHeat may have flame extending beyond its base. Move it to a smaller burner, or turn UltraHeat down until the flame stays under the pan.
• A broad stockpot can make better use of UltraHeat if its base covers the flame pattern and the pot sits securely on the grate.
• A thick cast-iron skillet may warm more slowly than a thin pan. Start at a moderate setting and allow time for the base to heat evenly rather than turning the burner to maximum by default.

The key check is simple: use a pan that covers the flame pattern, and confirm that it remains stable on the grate.

Preheat and Cook Without Flame Wrap

Flame wrap occurs when flames rise around the sides of a pan instead of staying beneath its base. It can overheat handles and damage exterior finishes. On nonstick cookware, prolonged heating while empty can also harm the coating, so begin with a suitable pan and a controlled burner setting.

Set up the burner and pan. Make sure the grate is seated correctly and the burner cap is in place, as described in the range manual. Center a flat-bottomed pan over the burner. A tilted or off-center pan may be less stable and can expose one side to more flame.

Ignite and adjust. Turn on the burner according to the appliance instructions, then set the flame for the cooking task. Preheat gradually. Use medium or lower heat for an empty nonstick pan, and avoid leaving any pan empty over heat longer than needed.

Add food or oil. When the pan is ready, add food or an oil suited to the recipe and its heat level. Oil smoke points vary by oil and product, so follow the label rather than treating UltraHeat as a fixed temperature setting. For searing, choose an oil intended for high-heat cooking; reduce the flame if it extends beyond the pan base.

Watch the flame as you cook. Flame size should match the pan and task. A high setting is not always faster or better: pan material, thickness, and food load change how quickly the contents heat. For deglazing, use only cookware rated for the method and follow its maker’s guidance.

If the flame reaches around the pan’s sides, lower the setting or move the pan to a better-sized burner. Do not use flame wrap as a way to heat the sides of a pot.

Clean the Grates and Maintain Cookware

Routine care starts only after the burner and cookware have cooled. Clean the grate and burner parts as directed in the range manual, and follow the cookware maker’s cleaning instructions. Good care helps keep the burner properly assembled and the pan’s surface in sound condition.

Turn the burner off after cooking. Let the grate, burner cap, and pan cool before cleaning. The range manual is the guide for removing and cleaning burner caps or clearing burner ports; do not guess at a cleaning method that could damage or misalign parts.

For cookware, use the cleaning method recommended by its maker. A pan with a coating may need different care from stainless steel or cast iron. Check handles and exterior surfaces for signs of excess heat after cooking, especially if flames had reached the pan’s sides.

If a burner flame looks unusual or a cap will not sit correctly, stop and consult the range manual or LG service guidance. Do not treat a cookware-size problem as a reason to adjust gas parts. For everyday use, first check that the pan is centered, the cap and grate are correctly placed, and the flame is set to suit the pan.

Serve Safely and Present the Dish

Serving safely means treating the pan and its handle as hot after cooking, even when the burner is off. Use a suitable trivet or heat-safe surface, and confirm that the cookware is rated for the serving or finishing method you plan to use.

Turn off the burner before moving the pan. Use a dry, heat-safe mitt or handle cover when needed, and place hot cookware on a surface that can withstand its heat. Pan handles can become hot, especially if flame has reached around the sides.

The UltraHeat rating does not specify an oven temperature or mean a pan is oven-safe. Oven limits depend on the cookware and its parts, including handles and lids. Check the maker’s stated limits before transferring a pan to an oven or using a particular finishing method.

Bottom line: UltraHeat is a high-output gas burner, not a cookware temperature setting. Check the rating for your LG model, choose a stable pan with a base suited to the flame, and lower the heat if the flame wraps around the sides.

Frequently Asked Questions

These quick answers cover the most common questions about LG UltraHeat output, cookware size, and safe use. Because range models and pans differ, use the guidance as a starting point and check the product manuals for model-specific limits.

How many BTU is an LG UltraHeat burner?
Many LG ranges rate UltraHeat at 18,000 BTU/h, about 5.28 kW. The exact output depends on the range model.

Is 18,000 BTU/h the pan’s temperature?
No. BTU/h measures burner heat input, not pan temperature. Pan temperature depends on the setting, cookware, and food load.

What size pan should I use on UltraHeat?
A 10–12-inch pan is a practical starting point. Check that its base covers the flame pattern and that it sits securely on the grate.

Can I use a small pot on UltraHeat?
Yes, if it is stable, but turn the flame down so it stays under the base. A smaller burner may suit it better.

Can I use cast iron on an LG gas range?
Gas-compatible cast iron generally works. Check that the pan sits securely and follow the cookware maker’s care instructions.

Can I use stainless steel or carbon steel cookware?
Gas-compatible stainless steel and carbon steel generally work. Match the pan base to the flame and follow the pan maker’s guidance.

Why does the flame reach up the sides of my pan?
The flame may be too high for the pan’s base, or the pan may be too small for that burner. Lower the heat or choose a larger pan.

Does UltraHeat make a pan heat faster?
It can provide more heat input, but heating time still depends on the pan’s size, material, thickness, burner setting, and food load.

Can I put any cookware used on UltraHeat in the oven?
No. Oven safety and temperature limits are cookware-specific. Check the maker’s instructions for the pan, lid, and handles.

How should I clean the UltraHeat burner?
Wait until it is cool, then follow the range manual for the grate, burner cap, and ports. Don’t use an unapproved method.

(This article was written by one of our staff writers, Julian R. Hayes. Visit our Meet the Team page.)