We all use ice to stop our cold drinks warming up too quickly. But how do we stop our hot drinks cooling down too fast? Hot ice? Don’t talk crazy. You need Coffee Joulies.
Make burnt tongues a thing of the past – these ingenious beans make blisteringly-hot coffee (or tea) drinkable, but also keep it hot for longer. How do they manage that? Good question. Pop the kettle on and we’ll explain.
Each of these polished, stainless steel beans has a phase change material (PCM) sealed inside. This high-tech stuff melts around140°F (60°C) and draws the heat out of your scolding coffee; so you can start sipping it sooner. However, it releases the heat that it has absorbed far slower than the hot liquid around them. So these clever beans will also delay the cooling of your drink.
Enough for your friends too
So rather than waiting for your cuppa to cool, then completely forgetting about it, drop a Coffee Joulie in to enjoy slurp after slurp of perfect temperature tea or coffee. And all this using only the wasted thermal energy of your drink. Magic beans? You better believe it.
Set of 5 Coffee Joulies
Polished stainless steel shells with phase change material (PCM) inside
Can you use these over and over again? Rob, Cambridge - 30th April 2012
Firebox says: Yes you can Rob!
I've had these for a few months and use them nearly every day. They look great and are very well made if a little bigger than I expected.
I use three in a travel mug and while they don't work miracles they do keep my coffee at a good drinking temperature for up to 2 hours instead of the drink going cold in the first half an hour or so.
I use them in a sip cup, but I think if you used an open top mug they might well crash into your nose/lip towards the end of the drink. Sam, Guildford - 27th February 2012