Further details of the Huettner project are proving hard to find, and for that very reason it can be safely assumed it was not a success.
HUETTNER STEAM PLANE
(1934)
Details from The Daily Telegraph for April 16, 1934 as reproduced in Steam Car Developments and Steam Aviation for June 1934:
The sad fate of the Berlin correspondent is probably explained by the following fact; in January 1933 Hitler was appointed Chancellor, i.e. head of the German government. Clearly his rearmament plans at that time included steam aviation...