Klean Kanteen Insulated Bottle
Test & Review

Before filling the bottle I rinsed the bottle with hot tap water to heat the bottle's inner wall which I believe most people do anyway.

I did this simple test for the 12 oz., 16 oz. and 20 oz. insulated bottles. I started with the 12 oz. size because most of the heat loss in any insulated bottle is through the top. So at least theoretically the 12 oz. should be the least efficient at retaining
heat of the three sizes.

One thing I did not consider at least in the first tests shown below is the amount of heat loss that happened each time I opened the bottle to take a temperature reading. So I included a test where I left the bottle closed until hour 6 to give you some idea of how much heat was lost taking interim measurements.

Which size Klean Kanteen Insulated Bottle is best for you?
Many of you already have an idea how you intend to use your bottle and under what circumstances. Instead of guessing the test results shown below will help you decide which bottle will work best for you because the capacity definitely affects how long it will keep the contents hot. The other thing to keep in mind is that I completely filled the bottles. Partially filled bottles will obviously reduce the time the contents stay hot because you're starting out with less energy.

• The Ideal temperature to serve coffee for optimum flavor is from 150°F to 170°F.
  
• According to Answers.com "...Soups and stews should be allowed to cool slightly to around 160ºF before serving. Do not allow the soup (especially pea soup) to sit out for extended periods of time below 140ºF. Bacteria growth can occur if soup is left out more than 2 hours at temps below 140ºF."
• All temperature readings are shown in degrees Fahrenheit