The correct boiler temperature is somewhat variable, and dependent on
the placement of the thermocouple on the boiler, the accuracy of the
thermocouple (mine was off by ~ 6 C when I calibrated it in boiling
water). I ended up with a boiler temp of 103 C (217 F) delivering 92
C (198 F) as measured by sticking a thermocouple bead probe up the
portafilter spout. (not as elegant as a thermofilter, but it works
Since your PID installation was a kit, I would imagine there is some
consistency in the offset from kit to kit, but I still think there is
enough variability among thermocouples to warrant checking the
temperature. Beg, borrow, or steal a temperature measuring device
that uses a bead type probe, since they have a fairly fast reponse.
The cheap "meat thermometer" types respond too slowly to work for
Alternatively, you can risk a significant caffeine buzz by bracketing
temperatures, and adjusting by taste, as long as all the other
variables are consistent.
On 12/20/06, Lauren Good wrote: