A 20 W Dummy Load

This time I have built a dummy load. I got this design from Elecraft. It is 8 100 ohm resistors rated for 3 W each. 4 in parallel first that gives 25 ohm and then in serial with another batch, so in total 50 ohm. I can also measure the voltage and use a graph to find the corresponding power. Max power should be 20 W.

Here is a few pictures:

And by the way, the box is from IKEA.