Inspired by your changes to the heat sensor and the need for having it in 2.1 I created Heat Sensor Redux.

Hallo! I commend the effort; however, I think it might be slightly useless as of Factorio 2.1 :/

One of the changes in it is that heat pipes can be connected to circuit networks to read their temperature :)
So, when it is released, I'm probably going to drop the heat sensor dependency.

Oh damn, I really should begin to read the changes ^^

It still made sense to bring it up to 2.1 for existing saves that utilize it.