Is it safe to blend hot soup?

It is, if you vent the jar. The hazard is not the heat itself but the steam: hot liquid agitated at speed flashes to vapor, and water expands roughly 1,600 times in volume when it turns to steam, which builds pressure faster than a sealed lid can hold. The result is a lid blown off and scalding liquid across the ceiling and the operator. Fill the jar no more than one-third, remove the small center cap from the lid, cover the opening with a folded towel, and start on the lowest speed.

How full can you fill a blender with hot liquid?

One-third, and no more than half under any circumstances. That is far less than the jar looks like it should take, and it is the single most important rule. The empty headroom gives expanding steam somewhere to go and gives the vortex room to form without pushing liquid up against the lid. Blending a large pot of soup therefore means three or four batches, which is why an immersion blender is genuinely more convenient for anything above about a quart.

Should you let soup cool before blending?

Cooling to below about 180 degrees Fahrenheit makes the job considerably safer, and letting it drop to warm makes it safe outright. Five to ten minutes off the heat with the pot lid off removes most of the flash-steam risk. If time allows, that is the simplest precaution available. If it does not, the third-full, vented-lid, towel-covered, start-slow procedure works — it is what professional kitchens use, and every step in it exists for a reason.

Can any blender handle hot liquid?

Not all of them. Glass jars tolerate heat well but can crack from thermal shock if they were cold or wet with cold water when hot liquid went in. Some plastic jars are rated for hot contents and some are not, and personal bullet-style blenders are the worst case — they seal completely, they are filled to the top by design, and several manufacturers explicitly prohibit hot liquids. Check your own manual, because Vitamix and Blendtec both publish specific hot-liquid procedures while budget brands often prohibit it.

Is an immersion blender better for soup?

For most home cooks, yes. An immersion blender works directly in the pot with no transfer, no batching and no sealed vessel, which removes the pressure hazard entirely and saves washing a jar. The trade-off is texture: a countertop blender produces a genuinely smoother, silkier puree because the jar geometry forces everything through the blades repeatedly. Use a stick blender for rustic soups and a countertop for velvety ones, in small vented batches.

Can You Put Hot Soup in a Blender?

Written & researched by Derek Holt Home & Appliances Editor

Updated October 2026

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Yes, but only with the jar vented and no more than one-third full. Hot liquid agitated at speed flashes to steam, and water expands about 1,600 times in volume when it vaporizes, which builds pressure faster than a sealed lid can contain. The result is a lid launched off the jar and scalding soup across the kitchen. The procedure is: fill to one-third, remove the small center cap from the lid, cover the opening with a folded kitchen towel, hold the lid down, and start on the lowest speed before ramping up.

Why does hot liquid blow the lid off?

Because a blender does two things at once that steam does not tolerate. It seals the jar, and it introduces enormous mechanical energy into liquid that is already near its boiling point. Blades spinning at speed both agitate the liquid and add heat through friction, and any water at or near 212 degrees Fahrenheit converts to vapor almost instantly. That vapor occupies roughly 1,600 times the volume of the water it came from.

Inside a sealed jar there is nowhere for it to go. Pressure builds in a second or two and the weakest point gives way, which is the lid. Because the jar is full of hot puree at the moment it lets go, the contents come out with force and cover the operator, who is standing directly over it with a hand on the lid. Scald burns from exactly this sequence are one of the more common kitchen appliance injuries, and every element of the standard procedure is designed to prevent it.

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What is the correct procedure?

Let it cool for five to ten minutes off the heat with the pot uncovered, if time allows. Below about 180 degrees Fahrenheit the flash-steam risk drops sharply.
Fill the jar no more than one-third. This is the rule that matters most, and it will feel absurdly conservative. Blend in batches.
Remove the center cap from the lid so steam has a continuous escape path. Almost every countertop blender lid has a removable insert for precisely this.
Cover the opening with a folded kitchen towel, not your hand, and hold the lid down firmly.
Start on the lowest speed and increase gradually. Starting at high speed is what generates the sudden pressure spike.
Stand slightly to the side rather than directly over the jar, and keep your face away from the vent opening.

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Which blenders can handle it?

Not all of them, and the differences matter. Check your own manual before assuming.

Type	Hot liquid	Note
Immersion / stick blender	Yes, in the pot	No sealed vessel; safest option
High-performance countertop	Yes, per manual	Vitamix and Blendtec publish specific hot-liquid procedures
Glass-jar countertop	Usually yes	Avoid thermal shock; jar must not be cold or wet with cold water
Plastic-jar countertop	Check the manual	Some jars are not rated for hot contents
Personal / bullet blender	Generally no	Fully sealed, filled to the top by design; often prohibited outright

Bullet-style blenders deserve the specific warning. Their cups screw onto the blade base with a complete seal and no vent, and the design intent is to fill them. Several manufacturers prohibit hot liquids in them explicitly, and a sealed cup of hot soup is the worst version of the pressure scenario.

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Is an immersion blender simply the better tool?

For most soup, yes. It works in the pot, so there is no transfer, no batching, no sealed vessel and no jar to wash. The pressure hazard disappears entirely because nothing is enclosed. At 150 to 400 watts a stick blender handles cooked vegetables, beans and squash without difficulty.

The trade-off is texture. A countertop blender jar is shaped to force everything down into the blades repeatedly, which is why it produces a genuinely silky puree that a stick blender cannot match — noticeable in a velouté, a bisque or a smooth tomato soup. The practical answer for most kitchens is to own both: the stick for rustic soups and speed, the countertop in small vented batches when the texture is the point.

Where to go next

If you are choosing a machine, what to look for in a blender covers jar material and safety features, and blender versus food processor settles which tool suits the job. On problems, see why a blender leaks from the bottom and why one smells like burning plastic, both of which get worse with hot contents. Shopping? The best blenders ranks models on aggregated owner ratings, inside the small kitchen appliances hub.

We never buy or physically handle the products we rank — our picks come from aggregated owner reviews and expert consensus, explained on how we rank. Your blender manual is the final authority on hot liquids in your model.