How do I know if my pan is at the right temperature?

The water-drop test is reliable: flick a few drops of water into a dry pan. At low heat they evaporate slowly. At medium they sizzle and disappear in seconds. At high heat they form a Leidenfrost ball and skitter across the surface before evaporating. Serious Eats explains the Leidenfrost effect and why it matters for cooking.

Why does my pan go from cold to burning so quickly on an induction hob?

Induction transfers heat directly to the pan's base, which warms far faster than gas or ceramic. The pan itself is the heating element. This means temperature changes are nearly instant — a setting that is fine for 2 minutes can overcook at 3. Which? explains induction hob behaviour. Start lower than you think you need and adjust up.

What does "medium heat" actually mean in a recipe?

Recipe heat labels are relative to your hob and pan combination, not absolute temperatures. Medium on a domestic gas hob typically corresponds to around 150–175 °C at the pan surface. The best calibration is behavioural: at medium, butter melts and foams gently without browning, onions soften in 8–10 minutes without colour, and a piece of meat sizzles steadily but not aggressively. BBC Good Food covers heat levels for common cooking tasks.

Does pan material affect how I should set the heat?

Yes. Cast iron retains heat well but heats unevenly at first — it needs longer to preheat but holds temperature when food is added. Stainless steel heats quickly and responds fast to adjustments. Non-stick pans should never exceed medium heat, as high temperatures degrade the coating. See the which pan, when guide for full details on pan material behaviour.

Why does adding food to a pan drop the temperature so much?

Cold or wet food absorbs thermal energy from the pan surface, dropping the temperature. The amount of drop depends on the food's mass, temperature and moisture content. Wet food drops the pan furthest because water requires a lot of energy to heat. This is why drying meat before searing, cooking in batches and preheating properly all matter — they minimise the temperature drop and maintain the conditions for the Maillard reaction.

Controlling heat on the hob

Why heat control is the core skill

Most cooking failures — burned garlic, pale seared meat, rubbery eggs — are heat failures rather than recipe failures. Understanding what your hob is actually doing, and being able to read the pan, is the single most transferable skill in cooking. Serious Eats argues it underpins every other technique.

The three useful heat levels

Low heat (around 90–130 °C at the pan surface)

Used for: melting chocolate, cooking eggs gently, sweating vegetables without colour, warming sauces. At low heat, butter melts slowly and fat barely shimmers. You can hold food at low heat without it burning while you prepare other parts of a dish. The sweat technique depends entirely on maintaining this level.

Medium heat (around 150–175 °C)

The most used level. Used for: sautéing onions, cooking pancakes, frying eggs, making roux, building sauces. At medium, butter foams and begins to colour slowly. A piece of onion hisses steadily. Food cooks through without the outside burning before the inside is done.

High heat (175 °C+)

Used for: searing meat, stir-frying, getting a crust on fish. At high heat, a dry pan will begin to smoke (if empty). Oil shimmers immediately when added. Food sizzles aggressively. The Maillard reaction — responsible for browning flavour — requires temperatures above roughly 140 °C, which means high heat is essential for a good crust. See the searing and browning guide for more.

How to read your pan

You do not need a thermometer to check pan temperature for most cooking tasks. Use these behavioural cues:

Water drop test: flick a few drops onto the dry pan. Slow evaporation = low. Quick sizzle = medium. Leidenfrost ball that rolls = high.
Oil shimmer: add a small amount of neutral oil. It will shimmer at around 180 °C. If it smokes immediately, the pan is too hot.
Butter cue: butter foams and eventually browns. Steady foam = medium. Rapid browning = high. Instant brown = too hot.

According to BBC Good Food, most home cooks err on the side of too-low heat, producing pale, steamed food rather than the browned result they wanted.

Pan material changes the rules

Cast iron holds heat but takes 5–8 minutes to heat evenly — preheat slowly. Stainless steel heats faster and responds to adjustment quickly. Non-stick should never exceed medium. Thin aluminium pans have hot spots and need constant attention. See the which pan, when guide for full material comparisons.

Adjusting for your hob type

Gas gives instant visual feedback from the flame size. Ceramic and halogen are slower to heat and cool. Induction is the fastest and most precise — it heats the pan base directly. On induction, always start at a lower setting than you think you need. The Good Housekeeping guide to induction hobs explains how to calibrate settings by task.

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