Strafe - the link worked
A few things I noticed in reading over the article - they use a 1048 pump and 3/8" tubing for the testing. (they also did testing with a 1005 and 1/4" tubing) They used a heat load of only 80W. Lastly, out of all the blocks they tested, the difference from first place to last place was
less than 1 degree C. If you throw out the original Senfu block, the spread is only 0.5C. Considering potential test and measurement error sources, basically a dead heat (ewwwwww, bad pun!).
It does provide some insight into the thinking of the German wc market though (medium heat loads, small hose diameters, small pumps).