Is there a downside to using already hot water in an automatic drip coffee maker?

by admin on June 8, 2010

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?

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{ 8 comments… read them below or add one }

Stardust Fairy June 8, 2010 at 1:43 pm

I guess that since it heats the water they don’t want the water to be too hot. I have also heard that if you use really cold water it makes the coffee taste better.

Good Luck

amo45 June 8, 2010 at 2:18 pm

it used to be that hot water heaters sometimes would cause an off taste(caused by sediment-which could clog your coffee maker) most now -unless yours is antiquated should be just fine

Eviechatter June 8, 2010 at 2:53 pm

I wouldn’t think the water wouldn’t run throgh as long , leaving you with weak coffee. Because when the water gets a certain temp ,it stops and keeps the coffee hot.
That’s the only reason I know of.

cynthia e June 8, 2010 at 3:41 pm

It is bad for your machine, causes build up such as limescale to clog and slow down brewing time. If you still want to use hot water instead of cold, clean ur coffee maker at least onc a month with an automatic drip coffeemaker cleaner such as, Whink.

gastronomist extremist June 8, 2010 at 4:13 pm

if the water is too hot for coffee beans, it doesn’t release all the essential oils with the flavours of the coffee…so try to stay away from it…but using too cool water wont bear enough flavours as well…so be careful…happy cooking!!!

TitoBob June 8, 2010 at 4:35 pm

I don’t see that any physical harm can come to the coffee maker by using hot water instead of cold. However, I see two reasons why the manufacturer might suggest always using cold water. (1) The coffee maker has been engineered to do its best work using cold water to start with, and (2) Most water heaters remove minerals from the water they heat, and that would change the taste of the coffee, most often for the worse.

finnegan June 8, 2010 at 5:15 pm

It’s not bad for the machine but you may want to consider these points (albeit some may be a tad esoteric):
Hot water from the tap may include unwanted detritus (or at least, be filtered through same detritus) from your water heater, this will affect taste.
Hot water holds less oxygen than cold which also affects flavor. The colder the water going in, the better the flavor.
Since your coffee maker already has the elements to heat the water, why would you do this anyway? The coffee maker will surely get the water hotter than anything coming from the tap (unless you have your thermostat set at an unsafe temperature!)

What the Deuce?! June 8, 2010 at 5:39 pm

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.

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