I have had the Bonavita BV1800 for about 5 weeks now and can't seem to get the taste that I'm looking for compared to my 7 year old Technivorm KBTS. My grinder is the Rocky doserless. I bought the Bonavita for my place of work so I could have my same wonderful tasting coffee as home with the Technivorm. I use a grind setting of 32 with the Technivorm, and the coffee just taste wonderful! With the Bonavita the coffee just taste more acidic/over extracted. I'm grinding for the last few days at about a setting of 38-40 on the Rocky, still can't seem to get the wonderful finished brew taste of the Technivorm! I'm using the same amount of coffee in each brewer. Any suggestions concerning the amount of coffee or the grind would be much appreciated. I do know that the Bonavita does have a slightly higher brew temperature and time, but its so close to the Technivorm concerning dwell time and temperature that I can't believe that's the problem. I have had the Technivorm for around 7 years and would buy another one if mine ever fails. I bought the Bonavita to save a little money and because it's my work brewer.
I have the thermal version, I have found that it likes a pretty coarse grind like a fine french press. Due to the coarse grind it may be showing a limitation of your Rocky since it's designed as an espresso grinder. I would try it with another grinder if you can. Unless the rocky is suppose to be good for press i.e. little to no fines.
Also, I find that little blooming does wonders for it too.
Hi, back - I know that logic and some of the opinions that you read on here about making coffee are not always fellow travellers, but given that both machines pour water at more or less identical temperatures through the same coffee bed, in the same shaped cone, using (I assume) the same filters, and at the same rate, then if there were to be a problem with the grind, it would produce the same result in both machines ?
Have you tried both at home - side by side, with freshly drawn water ? Even better might be to try that, and get someone to run both brewers for you and do a blind test.
I don't find either machine needs a particularly coarse grind.
I think there may be one or two other folk with both machines on here, so they may chime in also with valid comparisons.
I have a the European Melitta version with the glass carafe (1440 watt 110v engineering sample sent to me a while back by Bonavita) and a European Dowe Egberts version of the Technivorm (1460 watts and 110v) with a glass carafe. I can not tell a difference in the coffee produced by these machines using the same fine grind from my Baratza Preciso.
I chew coffee beans with my teeth while gargling with 195 F water to enjoy coffee. What is this "coffee brewing" device you speak of?
I think I figured out what was going on with my Bonavita BV1800 glass coffee brewer concerning the difference in taste compared to the Technivorm KBTS. Upon looking closely at the inside of the filter holder there was some plastic constriction at the beginning of the output! That would make sense now! The coffee tasted over extracted. I carefully measured the output tube and it was (.149") and (.154-.155") at the output side. I drilled with a new bit at around 1000rpm to open the output tube to (.155"). The hot water now comes out at a higher rate, more like the Technivorm KBTS at home. I will really know tomorrow morning when I make the new batch of coffee here at work. I wish I would have looked at this first thing this morning! My coffee might have been better, although it wasn't bad because I have been playing with the grind.
Pleased that you got it sorted. It's surprising isn't it, that such a small difference in the filter holder would make such a large difference in the cup. Presumably yours was slowing down the flow rate too much. Good job it didn't overflow.
Both of the Technivorms I have don't have that half/full switch option thingie on the filter holder that some have, and the outlet hole is fairly large in the middle at the very bottom.
The Melitta - like yours most probably - has the outlet about 10mm up from the bottom, with a pattern of raised lines which I assume are designed to hold the paper slightly away from the filter holder, and let the water sort of syphon up the last bit. Don't know. Anyhow it works. They must have had a reason for designing it like that I guess.
I haven't found that the difference in the outlet sizes or placings makes any measurable difference in the flow rate though. I've always assumed that the coffee bed and the filter paper were the main factors in limiting the flow.
Anyway, you now have 2 of the best domestic drip coffee makers around, so enjoy ;o)
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