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How does a water cooler with both cold and hot water work? There is one big jug of water and two knobs...?
...but one puts out cold water and the other hot water. I want to know how this works. Is the water in the jug room temperature? What controls the hot and cold temperatures of the water?
This may seem like a dumb question, but I really have no idea how it works. Can anyone inform me?
Here is a picture of the cooler I'm talking about, if I've confused you. 
http://www.thegeminiweb.com/babyboomer/wp-content/uploads/2006/06/watercooler.jpg
I'm not interested in buying one, it's just that my dad's office used to have one and I could never figure out how it worked.
These units convert electricity into either heat or refrigeration. The bottled water, as you suspect, is at room temperature. If you press the red (hot) tap it allows water to flow over heating coils and comes out heated. The blue knob works like a standard water-cooler (that sends the water up in a stream that you can drink from). It brings the water through cooling pipes and (at least at first; if you run it too long it will cease to be cold until you let it sit for awhile).
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