Looks like a foot long device you drop in your water tank to raise the temp
to 40 degrees Celsius, a Warmwasserheizer.  Looks like a pretty clean
install.

Does anyone know anything about this device?  Can anyone translate better
than Babelfish?  Anyone want to tell me how many Optimas I'd need to drain
in order to heat up a Westy water tank?

Reimo catalog, page 231

Warmwasserheizstab Campingstar
Warmwasser in Kanister oder Tank thermostatisch geregelt.
Max. 40 degree - keine Verbruhungsgefahr
Einfach nachrustbar

item 67036 12V/75 Watt  DM 108.90

or ...

Warm water heating staff Campingstar warm water in cans or tank
thermalstatically regulated. Max. 40 degree - no verb resting danger simple
nachrustbar

Ty Graham
'91 Syncro Westy
'86 Syncro Doublecab