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Bunn ThermoFresh: Brews Too Fast; Weak Coffee
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steelgtr
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Joined: 29 Jun 2013
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Posted Wed Feb 26, 2014, 3:09pm
Subject: Bunn ThermoFresh: Brews Too Fast; Weak Coffee
 

Thought I'd try the Bunn again. 10 grams drip grind coffee per 5 oz/ H20.

Even with the restricted spray nozzle, it brews too fast to get a strong extraction. Temp is 195 °'s on a calibrated Thermapen.

Tried 25 oz of water, (our morning batch) without filter or coffee. Took 2 minutes. Same test with our old Mr Coffee  5 minutes.

I love the proper temp from the Bunn but we can't get that deep robust flavor that we like. Any ideas?

thx

bob
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DigMe
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Posted Thu Feb 27, 2014, 10:46am
Subject: Re: Bunn ThermoFresh: Brews Too Fast; Weak Coffee
 

Have you tried grinding finer?

Of course the water is going to flow faster than a Mr. Coffee - that's one thing Bunn is known for is a fast brew.  

brad

 
ch-ch-ch-ch-ch
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sweaner
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sweaner
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Posted Sat Mar 1, 2014, 11:15am
Subject: Re: Bunn ThermoFresh: Brews Too Fast; Weak Coffee
 

I wonder what would happen if you double up the filter?

 
-Scott
“Coffee - the favorite drink of the civilized world.”
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steelgtr
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Joined: 29 Jun 2013
Posts: 113
Location: San Jose
Expertise: I love coffee

Espresso: Saeco
Grinder: Baratza Encore
Drip: TV Moccamaster/ glass
Roaster: WB Air Crazy/ Sifter
Posted Sat Mar 1, 2014, 6:25pm
Subject: Re: Bunn ThermoFresh: Brews Too Fast; Weak Coffee
 

sweaner Said:

I wonder what would happen if you double up the filter?

Posted March 1, 2014 link

I did try that and it helped some.  Might go x3 next time :) And I haven't tried  finer grind yet.

bob
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steelgtr
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Joined: 29 Jun 2013
Posts: 113
Location: San Jose
Expertise: I love coffee

Espresso: Saeco
Grinder: Baratza Encore
Drip: TV Moccamaster/ glass
Roaster: WB Air Crazy/ Sifter
Posted Mon Mar 3, 2014, 6:34pm
Subject: Re: Bunn ThermoFresh: Brews Too Fast; Weak Coffee
 

DigMe Said:

Have you tried grinding finer?

Of course the water is going to flow faster than a Mr. Coffee - that's one thing Bunn is known for is a fast brew.  

brad

Posted February 27, 2014 link

So,  Fast= Weak ??
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calblacksmith
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calblacksmith
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Posted Wed Mar 5, 2014, 6:43am
Subject: Re: Bunn ThermoFresh: Brews Too Fast; Weak Coffee
 

Well, no. Weak is weak.
Part of the problem may be the coffee you are using. If it is from a can, it is stale, stale ground beans result in a thinner, stale tasting brew. Properly roasted and ground beans, less than a month (two weeks for espresso) from THE DAY THEY WERE ROASTED and no more than 15 minutes from the time they were ground should make a big difference VS caned store bought coffee.

If you haven't yet, you may want to check out this thread.
"Coffee ratios"

 
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Anything I post is personal opinion and is only worth as much as anyone else's personal opinion. YMMV!

Feed the newbs, starve the trolls and above all enjoy what you drink!
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steelgtr
Senior Member


Joined: 29 Jun 2013
Posts: 113
Location: San Jose
Expertise: I love coffee

Espresso: Saeco
Grinder: Baratza Encore
Drip: TV Moccamaster/ glass
Roaster: WB Air Crazy/ Sifter
Posted Wed Mar 5, 2014, 7:15am
Subject: Re: Bunn ThermoFresh: Brews Too Fast; Weak Coffee
 

calblacksmith Said:

Well, no. Weak is weak.
Part of the problem may be the coffee you are using. If it is from a can, it is stale, stale ground beans result in a thinner, stale tasting brew. Properly roasted and ground beans, less than a month (two weeks for espresso) from THE DAY THEY WERE ROASTED and no more than 15 minutes from the time they were ground should make a big difference VS caned store bought coffee.

If you haven't yet, you may want to check out this thread.
"Coffee ratios"

Posted March 5, 2014 link


We use pre-ground Starbucks HB or Verona.  10 grams/ 5 oz water. Same as always.  Makes strong coffee in the Braun or Mr. Coffee.

bob
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DigMe
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Posted Wed Mar 5, 2014, 7:46am
Subject: Re: Bunn ThermoFresh: Brews Too Fast; Weak Coffee
 

steelgtr Said:

We use pre-ground Starbucks HB or Verona.  10 grams/ 5 oz water. Same as always.  Makes strong coffee in the Braun or Mr. Coffee.

bob

Posted March 5, 2014 link

Mr. Coffee and Braun are similar to each other.  The Bunn works in a different way.  They both pour water over grounds but the Bunn is definitely a different animal.  Just like you wouldn't expect to throw the same grind coarseness in an espresso machine or french press and have it work equally well you must adjust grind for any given machine.  Yet another reason why it's worth spending $90 on a grinder such as the Capresso Infinity.  Instant adjustments and then set it and forget it.  My Infinity has lasted me over 10 years so far.  Great investment.  

brad

 
ch-ch-ch-ch-ch
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MrBromeo
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Joined: 23 Sep 2003
Posts: 47
Location: Seattle
Posted Wed May 21, 2014, 10:21am
Subject: Re: Bunn ThermoFresh: Brews Too Fast; Weak Coffee
 

I, too, recently tried a BUNN again, mainly to evaluate as a larger/faster brewer for the office against my Technivorm. I roast my own beans, although in a pinch I'll buy reasonably fresh beans. In either case, I always grind at home just enough beans right before brewing.

10g/5oz works out to 68g/L. I usually do 60g/L in my Technivorm, ground a bit coarser than sugar. That brews a robust cup of joe, one that is "lip-smackingly good"... I will say the Tv will bring out the best and worst of the beans. It's like a really good stereo amplifier - I taste aspects in my coffees that I don't taste with other brewing methods. It can also be too intense if I want a third cup. I have to stop at two servings.

The same recipe in the BUNN (Velocity Brew NHB) gives a mellow cup. It's different than the Technivorm. It's like the same amplifier, but someone turned down the bass and treble. By the second serving, you could probably blindfold me and secretly switch out the BUNN coffee for a cup of hot water, and I might not notice. It's that mellow, and I can drink a third cup, even if it no longer really tastes like anything. However, later in the day, if I re-heat some of the BUNN coffee, it tastes like coffee again. Strange effect.

So, steelgtr, it's not just you.
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MrBromeo
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Joined: 23 Sep 2003
Posts: 47
Location: Seattle
Posted Thu May 22, 2014, 11:55am
Subject: Re: Bunn ThermoFresh: Brews Too Fast; Weak Coffee
 

UPDATE: Maybe I spoke too soon. I gave the BUNN another chance this morning and the finished coffee came out "lip-smackingly good!" I'd say every bit as enjoyable as what my Technivorm produces.

Here's what I did differently:

- Preheated everything by "brewing" 500ml of water and waiting for the tank to re-heat
- Added 40g of fresh ground coffee to a BUNN filter
- Added 750 ml of fresh water
- Using carbon filtered water to remove residual chloramine
- Pausing the brew at the 20 second mark, stirring the slurry, waiting a minute, then resuming

Preheating the brewer is an extra step, but does help by topping up any water lost via evaporation. Hmm. One could even use it as an opportunity to rinse the paper filter.

Yesterday, I picked up a new pack of Britta water pitcher filters, and flushed the BUNN tank with filtered water. Our city water tests as good or better than any quality bottled water. Mountain sourced, it is naturally low in hardness, but does have 1 ppm chloramine for sanitization. I can smell the chloramine in the water. I believe the residual chloramine significantly affects the finished coffee by attacking the organic compounds (the very function of any sanitizer). the Britta filter removes the chloramine completely.

So this tells me filtering the chloramine out is a benefit, and extending the brew time/stirring helps when making a half batch, especially when using fresh roasted beans. I'd rather skip the stirring step - the "turbulent" spray head on the BUNN should make it unnecessary. Maybe I need to try the low-flow spray head.

Of course, a potential downside of the BUNN is the cost of keeping the water tank constantly heated. Over a period of a few years, the extra $30-80 in electricity will catch up to the price differential of the Technivorm. Putting the BUNN on a timer would certainly mitigate that. Seems strange that the tank isn't more insulated - there is a lot of heat unnecessarily radiating off the machine... 40W to be precise.

I'll keep playing with both, but ultimately I'd like to be able to have a good idea of the pros and cons of each machine, especially when it comes to recommending a coffee brewer to friends and family.
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