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A lot of coffee pots these days come with a hot water reservoir. In fact my wife bought me a decent coffee machine for Christmas in 2011 that had a hot water reservoir. She sues it for making hot tea in the morning.
I tested the hot water reservoir not long ago just to see what temp the water came out at. I measured around 190 degrees in my mug meaning that it was probably a pinch higher in the chamber under the heating element.
Many high end coffee makers report there brewing process brings the water temperature up to 200 degrees (the ideal temp for brewing coffee) but even that is 12 degrees under that of boiling water.
Out of curiosity I actually went to my stove and started boiling water. During the full boil I picked the pan up and poured the water out into my mug and measured it at 195.
How is that possible I thought. Seems the first bit of temp drops pretty quick when removed from the heat source.
Can you use a coffee pot to boil water?
Yeah, for all basic needs the water coming out of a coffee maker is probably going to be a bit below the temperature of boiling water from your stove or a flame. But then again it's not likely to be low enough to hinder what you are up to.
If you truly need boiling water 200-212 degree water I suggest using a stove top but if 185-190 is fine then most quality coffee machines will do just fine. Just make sure to clean the pot real good if you want to minimize your chances of getting any residual coffee flavor in your water as it passes through an empty coffee filter basket.