Maybe something like this will serve you?http://www.seeedstudio.com/depot/water-level-switch-p-565.html?cPath=156_160
I don't really want to have to cut through the bottom of the water tank
Also, if the water boils and makes the float switch, it might cut the circuit to the relay controlling the boil. But could be solved with a short timer of the connection time.
Please enter a valid email to subscribe
We need to confirm your email address.
To complete the subscription, please click the link in the
email we just sent you.
Thank you for subscribing!
via Egeo 16