Kettle Overshoot
Posted: Sun Sep 19, 2010 8:22 pm
When my Zafiro went clang, I had to rapidly revise my presspot technique, so that my daily shots weren't horribly bitter. After seeing a couple of articles by James H and Mark P., it was clear that I needed to brew presspot at the same temp as the Zafiro, to avoid bitterness caused by grounds scalding.
From kettle boil to about 92C involved a time delay of about 4 minutes - perfect as this was the time it took me to grind 10g and nuke some milk.
Last week the old kettle died, so you can imagine my surprise when the new kettle produced bitterness and a surpising lack of coffee bloom. Shoving a t/couple into the kettle (at 4 minutes) showed a high temp of 97C !!
This is a puzzle as both kettles are polypoplene shell and would have equal heat retention characteristics. I guess there must be more temperature overshoot with the newer kettle. I recall "overshoot" feaures large in articles about surfing single boiler machines.
From kettle boil to about 92C involved a time delay of about 4 minutes - perfect as this was the time it took me to grind 10g and nuke some milk.
Last week the old kettle died, so you can imagine my surprise when the new kettle produced bitterness and a surpising lack of coffee bloom. Shoving a t/couple into the kettle (at 4 minutes) showed a high temp of 97C !!
This is a puzzle as both kettles are polypoplene shell and would have equal heat retention characteristics. I guess there must be more temperature overshoot with the newer kettle. I recall "overshoot" feaures large in articles about surfing single boiler machines.