When I got my new espresso machine in 2015 I had quite some problems with the fluctuating temperature of the boiler.
So I decided to replace the bimetal thermostat with a PID controller.
I installed the controller in an external plastic box, so I didn’t have to cut any holes in the machine (just in case I want to sell the machine).
Second modification was adding a cheap LED light source.
Pictures
Dismantled 1 Dismantled 2 From Top From Front From Side
