That s not because steel is inherently better than ceramic but because of the manufacturing process surrounding them.
Ceramic burrs vs steel burrs.
As far as i know you ll usually find either ceramic or steel burrs.
In general ceramic burrs tend to last longer than stainless steel burrs.
In general for most people brewing at home i d say that steel burrs are better.
Since ceramic and steel burrs have different heat conducting abilities.
I haven t noticed this myself and i m not sure the argument would even apply to hand grinding.
Or so the argument goes.
Last twice as long as steel burrs before requiring replacement.
Ceramic burrs advantages.
Heat is an important factor when it comes to coffee grinder burrs because any extra heat impacts your coffee s flavor since it burns off some oils present on the beans.
Ceramic burrs are more brittle than steel so you could chip the ceramic burr if a very hard rock was hiding in the beans.
Ceramic burrs run a little cooler than steel burrs and there are some coffee experts who think the extra heat burns off some of the oils and impacts the flavor of the coffee.
Malling wrote vario with steel burr have defiantly improved the in the cup result compared to the ceramic type burrs usually found in vario for all the other brewing methods but it s still inferior when compared to a bulk grinder the vario with steel burrs it for people who is on a budget and who doesn t have the space for a bulk grinder.
Where as you typically want a harder steel for mills you also want something corrosive resistant but often a compromise needs to be made between one of the other.
Steel burrs disadvantages.
Ceramic burrs are molded so in order to get a high quality ceramic burr you have to a very high quality and very expensive mold.
The burrs heat up during the grinding process and this heat tends to change the taste of the ground coffee.
The lifespan is about half the time per pound of coffee as the ceramics but most can be replaced.
Stainless steel burr grinders typically make it through 500 to 1 000 pounds of coffee.
First off ceramic burrs run a bit cooler compared to steel burrs or in other words they don t heat up as fast or retain heat as much as their metal counterparts.
And from what i have heard from people out there.
Baratza rates theirs for 750 pounds of coffee but reports indicate that they may be good for up to 2500 pounds.
Steel burrs though usually stainless steel can still corrode depending on the type of steel used.
Ceramic burrs transfer less heat compared to steel ones this means that the type of burr used can affect the taste of coffee.
Ceramic burrs are harder than steel and last on average about twice as long as steel burrs.