You can blend hot liquids, but only safely if you vent the lid and do not fill the jar more than two-thirds full, because steam builds pressure that can blow the lid off and splash hot liquid. Many blenders are rated for hot blending and some high-speed models even make soup hot through friction. With a sealed jar and a full load of hot liquid, though, blending is dangerous.

Quick Answer

Blend hot liquids only with the lid vented and the jar no more than two-thirds full, starting on low. Steam builds pressure and can blow the lid off. An immersion blender avoids this by blending in the pot.

Short Answer

Yes, you can blend hot liquids if you vent the lid, fill the jar no more than two-thirds, and start slow. Steam pressure is the danger. An immersion blender is the safest way to blend hot soup, since it works in the pot.

Why Hot Liquids Are Risky in a Blender

Hot liquid releases steam, and a sealed blender jar traps it. As the blades spin and heat builds, pressure can force the lid off and spray scalding liquid. This is the main cause of hot-blending accidents, and it is entirely avoidable with the right technique.

Key Takeaway: The danger is trapped steam, not the heat itself. Vent the lid and leave headroom, and hot blending is safe.

How to Blend Hot Liquids Safely

  1. Fill the jar no more than two-thirds full.
  2. Remove the lid’s centre cap or vent it to let steam escape.
  3. Cover the opening with a folded towel to catch splatter.
  4. Start on the lowest speed, then increase gradually.
  5. Hold the lid down firmly while blending.

Use an Immersion Blender Instead

The safest way to blend hot soup is an immersion blender, which works directly in the pot with no sealed jar and no steam pressure. For soups, it is the easiest and safest option; see our best immersion blenders.

Blenders Rated for Hot Blending

Some high-speed blenders are designed for hot liquids and even heat soup through blade friction. Check your blender’s manual: if it is rated for hot blending, follow its instructions; if not, let liquids cool or use an immersion blender.

What to Avoid

  • Filling a sealed jar with hot liquid.
  • Blending hot liquid in a personal blender’s sealed cup.
  • Starting on high speed with hot liquid.
  • Holding the lid loosely while blending hot soup.

FAQ

Can you put hot liquid in a blender?

Yes, if you vent the lid, fill no more than two-thirds, and start slow. A sealed jar traps steam and can blow the lid off, so venting is essential.

Is it safe to blend hot soup?

It is safe if you vent the lid and leave headroom, or use an immersion blender in the pot. Blending hot soup in a sealed jar is dangerous due to steam pressure.

Can you blend hot liquids in a personal blender?

No. Personal blenders use sealed cups that trap steam, which can build dangerous pressure. Let liquids cool or use a vented countertop blender or an immersion blender.

Bottom Line

You can blend hot liquids safely by venting the lid, leaving headroom and starting slow, or by using an immersion blender in the pot. Never blend hot liquid in a sealed jar or cup. For soups, an immersion blender is safest; see our best immersion blenders and best blenders guides.

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