You put the pan on the induction hob and it spins. You pour in a spoon of oil and it runs off into one corner by itself. The base no longer touches the hob everywhere, and cooking goes uneven: scorching in the middle, lukewarm at the edges.
The base is warped. Here's why, and why it's the only real way to permanently damage a stainless pan.
What happens inside the metal
Hot metal is expanded. Cold metal isn't. When you cool a screaming hot pan suddenly, the surface touching the water contracts in a fraction of a second while the rest is still expanded.
The two halves of the metal pull against each other. If the stress exceeds what the structure can absorb, it doesn't spring back: the base keeps a slight curve, a few tenths of a millimetre, invisible to the eye but enough to stop the pan sitting flat.
That's thermal shock. It takes two seconds, and it doesn't undo.
The four habits that warp a base
- Cold water into a screaming hot pan. The classic, usually done by reflex straight after cooking to “leave it to soak”.
- Running the hot pan under the tap. The same, but worse: the jet concentrates the cooling on one spot.
- Heating empty, for a long time, on maximum. With no food or liquid to absorb the heat, the base climbs far higher than in normal cooking.
- A pan much wider than the burner. The centre heats, the edges stay cold, and the difference builds up with every cook.
The first three are habits you can change. The fourth is settled at the moment of buying: which pan size to choose.
Can it be repaired?
Honestly: not at home.
You'll find videos of people hammering the base flat on a level surface. On thin sheet metal that can help marginally. On a thick base it's useless at best, and at worst you add a second deformation on top of the first.
A slightly warped pan stays usable on gas, where the flame follows the shape. On induction and ceramic it matters more: contact is what determines heat transfer. The right settings to avoid warping on induction: stainless pans on induction.
Which is why prevention is the whole subject. Everything else cleans off — sticky brown, white haze, rainbow tint, carbonised black. A warped base doesn't.
The three reflexes that prevent it
- Let the fiercest heat drop before adding water. A minute off the heat is enough. Then hot water, not cold.
- Deglaze instead of soaking. A splash of liquid in the still-warm pan, thirty seconds with a wooden spoon: the pan is clean and you have a sauce. That's the move that replaces soaking.
- Don't preheat empty on maximum. Medium-high, two to three minutes, and the water drop test to know when it's ready. Maximum achieves nothing and tires the metal.
How to tell whether the base really is warped
Two ten-second tests.
The ruler test: lay a metal ruler across the inside of the base. Look underneath it, against the light. A visible gap in the middle or at the edges means deformation.
The water test: pour a tablespoon of water into the cold pan sitting on a flat worktop. If it stays in the middle, the base is flat. If it always runs to the same place, it's warped — and now you know which way.
And if it's a manufacturing fault?
That happens: a base that wasn't flat out of the box, or that deforms during the first normal cooks. That isn't thermal shock, it's a defect, and it gets replaced.
Do both tests above, take a photo, and write to us: the guarantee covers deformation caused by a manufacturing defect. It doesn't cover a base warped by thermal shock — that's stated plainly on the page, and it's fair: no guarantee can cover cold water poured into a screaming hot pan.
In one sentence
Almost everything is recoverable on a stainless pan. A warped base is the exception, and it comes down to a single reflex: let it cool before you wet it.
Ours is here, 304 stainless with no coating, in 22, 24 and 28 cm, with 60 days to send it back even used.
