Drip Coffee
Is there a downside to using already Hot Water in an automatic drip Coffee Maker?
The instructions on my automatic drip coffee maker say to always use cold water, but I don't understand why it would make a difference. Since I like my coffee hot, I like to use hot water. I don't see what the problem is. Anyone got an explanation? Is it bad for the machine?
I assume you mean hot TAP water. If so, then not only is it bad for your coffee maker, it's also a waste of time.
Hot water, straight from the faucet, contains more dissolved minerals (calcium, assorted salts, etc) than cold water does. It's simply because of the temperature...more solids can be dissolved in hot water than in cold.
The same minerals that cause the scaling and "hard water" deposits in your bathtub will also clog up your Mr. Coffee. There are coffee machine cleaners (chemicals) that help remove these deposits, but eventually they'll build up so badly that the machine is ruined. Using hot water, rather than cold, will ultimately shorten the life of your coffee maker.
Also, the brewing temperature for most coffee machines is just about 170 degrees F; the "holding" temperature (the temperature on the hotplate) is usually a few degrees higher.
If you pour hot water into the reservoir, it won't affect the end-product coffee's temperature. Actually the same thing would be true if you filled the reservoir with ice! You'd end up with coffee of the same temperature as always...but it would take alot longer to brew, because the ice would have to melt first.
Flannel drip coffee
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