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Brewing coffee is a work of science in which numerous elements, including the three T's of coffee brewing, must align in order to extract the ideal coffee flavor.   Last month we looked at Time.  Now it's time to take a deeper look at the second T of proper brewing---Temperature.

Temperature

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Hello Dr. Brew! My name's Austin and I run a coffee shop/brewery in Silverton, CO. One of the customer service reps gave me your email in hopes you could help me with some questions about my old (but new to me) Bunn Dual.


I must preference we're above 9000 ft and we had to tinker quite a bit with our single head fetco to brew good
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Dear Dr. Brew


I anticipate some heat loss while brewing as a consequence of the ambient temperature, the temperature of the parts of the machine the water comes into contact with early on in the brew cycle, and whether or not the grounds are room temperature vs. frozen or refrigerated. That being said, assuming the coffeemaker is working correctly, should I see a ~30°F disparity between the advertised/optimal
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Question

Dear Dr. Brew,

Is there a way to set a controlled temperature on the warmers? We work at a nursing home and would like to have a cooler pot for some of our residents.

Gail

Answer

Dear Gail,

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Dear Doctor Brew,

We are using an ICB brewer with 3.8 thermal pots. The brew temperature is set to 93 degrees C with a 10% bypass and a brew time of 4.13 minutes for a full brew. However despite pre-warming of pots we are only getting 67 degrees C in the cup. Is this normal?
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Dear Dr. Brew,
I was just with a customer today who complained that pot-to-pot,
sometimes his coffee tastes "different," even though using the same
blend. I asked if perhaps they were brewing pots too close together,
and that the coffee maker hadn't had a chance to get to brewing
temperature. He countered that "steam comes out, so it's hot
enough." Well, the customer is always right, but I'm wondering if you
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Dr. Brew Speaks
Hope you are enjoying your vacation Dr. Brew! This is Part 2 of an article entitled Pulse Brew and Pre-infusion: New Tools for Filter Drip Brewing originally published in the Q1 2008 issue of Tea Coffee Asia.

The Crucial Three: Time, Temperature, Water Quality
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Dear Dr. Brew,

I have heard that I should not use water from my hot water faucet, i.e. from the household water heater line, but should always use the cold water line as a source. Is that due to temperature, quality, or something else? Does not the BUNN keep and hold hot water pretty much as a house water heater would? Thanks for any info.

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Dear Dr Brew,
Does the BUNN Home Brewer heat to a consistent 200 degrees all the way through the brew for proper extraction? Let me know, I would like to recommend it if it does, and get one for myself. Or, if you know how I can get properly extracted coffee at home, let me know.

Thanks so much

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