Hi.
The system not yet works, but at the moment, I am using a resistance similar to the commented by Incoherent. 10Ohms 10x10mm core.
If you wanted you could diminish the losses better isolating it, cutting the zone of leftover copper etc. The heat point is closely together of the water block, in this point I have de LM35 sensor.
I do not want to occupy much space with the images, I put the Link to you of the forum.
In the beginning of this message, there is an image of the internal part of the resistance. She is very thin. At the final, the first assembly.
page 1
And here possibly the final system without still mounting the electronics. I have taken advantage of to use the electronics of an electronic balance to measure the force of tightens.
page 2