I picked up a couple of these off eBay. The price was too good to only buy one.
http://www.ebay.com.au/itm/271355766269After looking around for a box to mount the thing, I decided on an old ATX computer power supply box. I stuffed up by thinking I would save a buck and use the IEC power input socket already mounted in the box, but after assembling the thing I found every IEC power cord I had is only 0.75mm^2 wire size and therefore smaller than what I was prepared to use.
I mounted a small 12v fan, that I removed from a failed computer graphics card, onto the power controller heatsink, and also left the original 12v cooling fan in the box. Both fans have a label rating of 140 milliamp, so I used a small 150ma 12v-0-12v transformer to drive the fans and half wave rectified the 12v by placing a diode in the centre tap connection to make it the negative to both fans. Each fan is using one half of the transformer.
I initially tried the controller out on a large desk fan, and found that the controller did not start to rotate the fan until the potentiometer was three quarters of the way to full power, however, powering a 2200 watt kettle the degree of rotation of the potentiometer seems to be in line with the percentage of power being provided by the power controller.
I am considering whether I should buy a 250 volt analogue meter ...
http://www.ebay.com.au/itm/110938888939 ... to fit into the box to give an accurate indication of the power going to the boiler. The power controller is right at this moment being used on my 2000 watt boiler and is so far performing faultlessly.