How? Why??

[marvholly]

I have a fairly new coffee pot (1 month old). I ALWAYS make a full pot – 12 cups. Fill the pot to the 12 cup mark, pour in, add ground coffee to the basket and turn on. Out comes brewed coffee to the 10 cup mark. What the devil happened?

Where did 2 cups go? NOTHING is on the hot plate or counter like there is a leak.

[suesinfl]

As the water heats up, it creates steam and evaporates, plus the coffee gounds hold some of the water as it passes through.

[cronewitch]

Maybe the reservoir holds a bit of water too low to get out, then evaporates between pots so you are refilling it too.

[marvholly]

May 6, 2012 7:44:26 GMT -5 suesinfl said:

As the water heats up, it creates steam and evaporates, plus the coffee gounds hold some of the water as it passes through.

Two cups out of 12 (16.7%) is a HUGE amount of steam/evaporation in a short time. I will have to check if any is left in the chamber immediatly after the pot finishes brewing.

NOTE: This did NOT happen with my last 4-6 pots of a different brand or I would not be questioning.

[Sum Dum Gai]

You'd have to see how much is left in the coffee grounds and filter before you can calculate how much you're losing to evaporation.

[thyme4change]

Somehow I find that cheap coffee pots seem to have this problem. If you are using tap water, could you be losing some to hard water deposits?

[ՏՇԾԵԵʅՏɧ_LԹՏՏʅҼ]

Yes, a good deal of that "lost water" is going to be the steam/vapor from brewing, plus the water that's absorbed by the grounds. There's also water absorbed by the filter. If you look inside the water chamber after the coffeemaker has cooled, you'll see condensation on the inner walls as well. Your carafe is probably also slightly tapered, so the markings probably aren't that accurate a measurement near the top of the carafe.

[kgb18]

Another problem could be the water you're using. Do you use tap water?

We bought a really expensive coffee pot and after not too long it started making less coffee than water we put in. I've had water evaporate around a cup or so. But once you start losing two or more cups, something else is up.

In our case, we were using tap water. Our tap water is very hard. I always joke that I'm surprised it doesn't hurt to take a shower. The hard water was clogging up our coffee pot with lime scale to the point where it would only make a few cups and just shut down. We would use CLR, get it all cleared out and a month or two later it would be clogged again. We started buying bottled water and haven't had a problem in almost a year.

[marvholly]

Iggy
I would have returned that Mr. Coffee and bought another bran (maybe w/o the auto timer) so fast the store CSR’s head would spin. It should have been under warrantee.

Thyme
Since it is a new pot (1 month) and I prob made only 10-12 pots I doubt hard water is an issue. Also, I vingar out my pots quarterly.

Scottish
I am ONLY comparing water in (via pot) to water out (via pot).

Kgb
I have ALWAYS used tap water (medium hard) and this is WAAAY more than expected.

All:
I have had electric pots for about 30 years. I am well aware of the amount of water usually absorbed by the filter and grounds.

[marvholly]

Made a pot today so I experimented:

Filled pot to 12 c mark
Made sure fill line in pot was 12 c
pre-wet filter
put in coffee grounds
ran unit
let cool down
checked if water left in pot
water left was 1/2T

Sill down an entire cup - I cannot believe 3 1/2 oz is from grounds absorbtion and or evaporation.

[cronewitch]

A cup isn't 8oz in coffee it is 5oz. Try weighing the coffee filter and grounds before and after the brewing to see how much more it weights. Weight the pot of water and the pot of coffee then you can compare the loss of coffee to the gain in filter and see how much disappeared.

[Abby Normal]

I've never made it through a whole brew cycle with out stealing a cup.

I'd never know if I had the problem or not.

[NoNamePerson]

I knew there was a good reason for me not drinking coffee. Problems with coffee pot would just drive me over the cliff