firstly, i would like to say that my new & old jager heaters are the best heaters i have ever had. they easily keep the tanks to what ever temp you select & the thermometers are always on or very near what the heater is set at.
I have noticed that both heaters i recently purchased, a 150W & a 300W both have small amounts of moisture in them. not drips of water but more fogging if you get my drift.
I don't think this is a good thing, i can only corrode the internals surely & lead to failure at some point wether that be in the next year or decade? what do you think & do you have a jager with the same thing? i also have an old 50W jager, i bought it second hand 4 years ago so can only guess its around 6 years old or more & it has no moisture in it what so ever.