Ok than.
There is a version with the use of the small pcb Edwin developed,and a version without.
They use different hardware like arduino , and sketch.
I suggest you to do some reading to start with.
I tried the ds18b20 into the boiler vapor path ,but into the boiler liquid is more stabil and the showed heatup time is better.
I mounted a ds18b20 into a small stainless steel pipe with silicone sealand , and installed it into the kettle with a pipe end coupling if I remember well 8mmx1/4" it is such a great feature to see how much time there is left to reach the heat temp you have set.
I used first only ds18b20 sensors , but a smt172 is way better ,as the steps for abv are large with a ds18b20.
So I use 4 sensors, 1 ds18b20 into the boiler , 1 smt172 to measure abv , 1 ds18b20 vent holes alarm sensor ,
1 ds18b20 cooling water sensor.
Please order the right lcd screen , a rgb type , as another forum member just ordered a normal one and it will not work.
I hope they still are available @ Robotdyne.