Posted Tue Jun 4, 2013, 4:00am Subject: High water temp on my Bonavita ??
Measured temp in two places..... 1- 204+ (maybe 205) right where hot water drips from machine and into filter basket AND 2- temp in slurry 204 to 205.5 (some fluctuating there as machine pulsed/dripped more water, especially toward end of brewing). I know we want temps from 195-205 but ARE MY MACHINE TEMPS TOO HIGH if staying @ 204 to 204.5 and up to 205.5 at it's highest?
Next brew cycle I'm testing again more accurately where water drips from machine. I used a Taylor 9847N I saw recommended here by some members.
Posted Thu Jun 6, 2013, 5:57am Subject: Re: High water temp on my Bonavita ??
There are a few questions I have:
1) are you brewing a full pot? 2) how long have you had the machine - could it be scaled up? - scale will give more resistance to flow through the element, so the water will need to heat further to make it to the showerhead. 3) what temperature is the water in the reservoir at? - hotter will lead to hotter water at the showerhead, as there's some cooling of the water as the pipe passes back through the reservoir on the way to shower head (not much, because the pipe is separated from the reservoir, but maybe a degree or two).
But first calibrate your thermometer by measuring the temperature of boiling water, and comparing to the boiling point at your altitude.
Posted Thu Jun 6, 2013, 2:30pm Subject: Re: High water temp on my Bonavita ??
I've had my Bonavita since 11/22/2012, just a little over 6 mos now. Yes, brewing whole pot (40oz) AND water is cool-cold when poured into reservoir. I checked my thermometer (Taylor 9847N) today in boiling water---210.5, which is in line with our altitude 978' and 210.265 F boiling point here (Lexington, KY).
OK, lots going on here currently so I have ____ for brains (LOL, love to hear Netphilospher's commentary on that!)
If you're brewing at 205 (highest in 195-205 range) and your boiling point is 212, you are brewing 7 degrees below boiling point. Currently I'm brewing at 204.5-205 which is apprx 5.24-5.74 degrees below my 210.265 boiling point (w/temp in slurry fluctuating 204 to 205.5, 4.74 degrees below my boiling point at highest).
Going to check brew temps again tomorrow. Do high temps cause bitterness or what? Coffee's been very inconsistent but could be due to grinder.
woodscomp Senior Member Joined: 29 May 2013 Posts: 14 Location: Knoxville Expertise: I live coffee
Posted Wed Jun 12, 2013, 2:21pm Subject: Re: High water temp on my Bonavita ??
I brewed at 205 on my Brazen, that is what I found worked best for my coffee. And I am not that much lower than you are in Knoxville, TN
I just replaced my Brazen with a Bonavita, and I can honestly say I wish I had purchased it from the start. Simple, quick, makes a great cup of coffee, I am happy with mine. My next pot I will check the temps on mine on though and let you know what i find.
Posted Thu Jun 13, 2013, 8:31am Subject: Re: High water temp on my Bonavita ??
I just measured the temperature a with a precision Laboratory Fluke (2175A) with a (30 Gage) K type thermocouple . I placed it about .125" from the center outlet hole of my office Bovavita glass brewer. The temperature at the 1 minute point of operation hitting 202-207 degrees F. The temperature in the basket should be somewhat cooler, maybe 2-3 degrees F. I did not measure the basket temp! I will do that some other day. The bonavita water tank was filled for this test at the 400ml mark. The total time for this test was about 2 minutes.
I've been using my bonavita now for about 5-7 weeks and still can't get the taste of my KBTS technivorm! The temperature from the Technivorm measured the same way is about 3-4 degrees F cooler! I think there is some over extraction going on. I does bug me that I can't get the coffee essence/taste as home with the technivorm KBTS.
Not that it matters here but if you're going for that many significant digits you'll also want to consider the barometric pressure. For example, in the last three days the boiling point of water at 978' in Lexington, KY theoretically varied between about 209.8 and 210.4° F along with the change in the barometer.
Another thing -- in the temperature range you're looking at those Taylor thermometers have a resolution of either 0.5°F or 0.1°C, so you get a more precise reading if you switch the mode to Celsius.
I have two of those Taylor 9847N probes and both are accurate to within ±1°C in the range 15 to 95°C.
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