Slapdash Thermal Carafe

Make a thermal carafe out of leftover parts and trash!

The familiar Thermos Bottle is extremely useful as well as being a groovy science demonstration, but they can be a little expensive if you need a lot of them or plan to be careless with them.

A little research into how a thermos works can point the way to building an inexpensive substitute. Using a couple of plastic bottles, some insulating material, and simple tools, we can make a slapdash thermal carafe.

cutaway view
Click to embiggen

The slapdash thermal carafe build log shows the steps for building a homemade thermos.

Predicatably enough, a thermal carafe made from junk doesn't retain heat as well as the professionaly-manufactured one, but it does OK. I tested the performance of the slapdash thermal carafe against a real Thermos brand thermos. The test results show how it did.

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local documentSlapdash Thermal Carafe Summary Page

local documentCarafe Build Log

local documentCarafe Test Results

local documentAddenda (feedback from readers)

local documentThermos Bottle (at Thermos.com)

local documentHow a thermos works (at HowStuffWorks.com)


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external document = external link


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