Stiebel Eltron is a company that makes many products, including water heaters and hand dryers.
The Ultronic is Stiebel Eltron's old high speed dryer, they are most notable for their installations at most EG sites. These were "recently" discontinued and replaced with the Stiebel Eltron Ultronic plus and Ultronic Premium.
00s Series 3000 (Picture courtesy Hand dryers by Dan)
The stiebel eltron electronic is an economy hand dryer.
It is rumoured there is a secret society out there that worships this hand dryer, to show their appreciation for it they create clones and decorate it with blue LEDs and make videos of themselves worshipping it.
The electronic was discontinued around the same time as the original ultronic, I cannot imagine what the funeral for this dryer is going to look like
Older Series 2000
The turbotronic is an extremely rare traditional hand dryer which looks near identical to the Electronic but with a faster motor
Electronic (pre hte4)
These are the previous economy hand dryers of Stiebel Eltron, these are extremely rare.
Ultronic Plus and Premium
These are the brand new high speed hand dryers from Stiebel Eltron, none have been found yet