Low heat on a stove means setting your burner dial to 1 or 2, whether your knob uses a 1-to-6 or 1-to-10 scale. In temperature terms, low heat produces surface temperatures roughly in the 200°F to 300°F range, though the exact number depends on your cookware, burner type, and what’s in the pan. For liquids, low heat keeps water well below a simmer, with little to no visible bubbling.
Where Low Falls on the Dial
Most stove knobs use either a 1-to-6 or 1-to-10 numbering system. On both scales, low heat sits at 1 to 2. Medium-low occupies the next step up (around 3 on a 1-to-6 dial, or 3 to 4 on a 1-to-10 dial). If your stove labels the dial with words instead of numbers, look for “Lo” or “Simmer” at the bottom of the range.
Keep in mind that stove dials aren’t precision instruments. Two stoves set to “2” can produce noticeably different amounts of heat, especially across burner sizes. A large burner on setting 2 will still put out more total energy than a small burner on the same setting. When a recipe calls for low heat, the visual and audio cues in your pan matter more than the number on the knob.
How Low Heat Looks and Sounds
On a gas stove, low heat produces a small, steady blue flame that barely extends beyond the burner ports. If the flame is yellow or flickering unevenly, that can indicate a gas flow issue rather than a proper low setting. The flame should form a clean, quiet ring close to the burner head.
On an electric or induction cooktop, you won’t have a visible flame to judge. Instead, watch the food. At true low heat, butter melts slowly without sizzling. Water in a pot stays still or produces the occasional lazy bubble. If you hear active sizzling or see steam rising quickly, you’re above low heat. A pan on low should feel warm to the touch when you hover your hand a few inches above it, not hot.
Low Heat vs. Simmer
These two terms overlap, and that causes a lot of confusion. A simmer is technically a liquid state: water between about 185°F and 205°F, with small bubbles gently and steadily breaking the surface. True low heat on most stoves sits at or just below that range. On some burners, the lowest setting keeps liquid below simmering temperature entirely, producing maybe 10 to 15 tiny bubbles per minute rather than a steady stream.
The practical takeaway: if a recipe says “reduce to a simmer,” you may need medium-low rather than the absolute lowest setting on your dial. A proper simmer has visible, consistent bubbling. If your pot is completely still, bump the heat up slightly. Conversely, if a recipe says “low heat” for something like melting chocolate or warming a sauce, it means below a simmer, with no bubbling at all.
What Low Heat Is Used For
Low heat is essential any time you need gentle, gradual warming without browning or boiling. The most common uses include:
- Melting chocolate: Milk chocolate melts between 104°F and 115°F, and white chocolate between 100°F and 110°F. Even dark chocolate melts by 120°F. These temperatures are far below what a medium burner produces, so low heat (or a double boiler) prevents scorching and seizing.
- Melting butter: When you want butter liquid but not browned or foaming, low heat gives you control. Higher settings quickly push butter past its smoke point.
- Sweating vegetables: Cooking onions, garlic, or celery until soft and translucent without any color. The goal is to release moisture slowly, and anything above low heat starts caramelizing the sugars.
- Warming sauces: Cream-based and egg-based sauces break or curdle at higher temperatures. Low heat keeps them smooth.
- Slow reductions: Reducing a stock or braise over hours at low heat concentrates flavor without burning the bottom of the pot.
- Poaching: Cooking eggs, fish, or chicken in liquid that’s barely moving. The gentle temperature preserves the shape and texture of delicate foods.
Slow cookers operate on a similar principle, holding food between roughly 170°F and 280°F over 4 to 12 hours. A stovetop set to low mimics the upper end of that range, which is why many slow-cooker recipes can be adapted to a covered Dutch oven on a low burner.
Why Cookware Matters at Low Heat
Hot spots become a bigger problem at low temperatures. When a burner is cranked up, the entire pan eventually reaches a high, relatively uniform temperature. At low heat, the center of the pan directly over the flame or element can be significantly hotter than the edges. In testing, even a high-quality cast iron Dutch oven showed a 68°F temperature difference between the center and the outer edge on a small burner. That gap is enough to scorch food in the middle while leaving the edges barely warm.
Pans with thick aluminum or copper cores distribute heat much more evenly. Well-constructed stainless steel cookware with a multi-layer base can hold that difference to as little as 11°F across the cooking surface. For low-heat tasks like making custard or melting chocolate, even heat distribution is the difference between success and a scorched mess. If your cookware has thin walls or a single-layer base, stirring frequently becomes your best tool for compensating.
Adjusting for Your Specific Stove
Gas, electric coil, smooth-top electric, and induction cooktops all behave differently at low settings. Gas burners offer the most responsive control because the flame changes instantly, but many gas stoves have a minimum flame threshold below which the burner simply turns off. If your gas stove can’t hold a small, steady flame, you may need a flame diffuser (a flat metal disc that sits between the burner and the pan) to spread and reduce the heat further.
Electric coil and smooth-top stoves cycle on and off to maintain low temperatures rather than producing a continuous low output. This means the actual heat fluctuates in waves. For delicate tasks, heavier pans help absorb those fluctuations and keep the cooking surface more stable. Induction cooktops give precise control at low settings, though cheaper models sometimes struggle to maintain very low power levels consistently.
The simplest calibration test: put a small pot of water on your lowest setting and wait 10 minutes. If the water is completely still, that’s below a simmer. If you see a few small bubbles forming on the bottom, you’re right at the low-heat sweet spot. If the water is actively bubbling, your “low” setting runs hotter than typical, and you’ll want to be aware of that every time a recipe calls for gentle heat.