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Frequently Asked Questions
Nothing. They are two names for the same object, and you will see both used here and elsewhere. Vacuum bottle describes what it is; vacuum flask is the more common phrasing in British English. Everything in this collection is both.
That varies by model and by how full you fill it, so the individual product page carries the number. Two things are true of any flask: a full one outlasts a half-empty one, because the air in the gap is what drains the heat away, and warming the flask through before you fill it adds time on top.
Stainless steel doesn't absorb flavour the way plastic does, so a properly washed flask won't carry yesterday's coffee into today's. Rinse it out after each use rather than leaving it sealed with dregs in the bottom.
Yes. Vacuum insulation slows heat moving in either direction, so the same flask keeps iced drinks cold.
They are. Separate the stopper into its parts first, otherwise the threads never really get clean.
Because a thermos is a brand, not a type of product. THERMOS is a registered trade mark belonging to another company. Across Europe the word gets used loosely, as though it named a type of product rather than a maker. Loose speech is one thing; putting another company's brand name on our own products is another, because it would be misleading about who made them.
The technology has its own name, and it is vacuum insulation. A double wall of stainless steel with the air evacuated from the gap, leaving almost nothing behind to carry heat in either direction. That is what holds a drink hot for hours rather than minutes, and it is what William Stanley Jr made when he built the first all-steel vacuum bottle in 1913.