that thing definitely had an issue while it was in the water... look at all the corrosion. have you had unexplained fish deaths lately? i would think there was most likely some electrical discharge at some point.
i tell you what... i'm glad i buy cheap equipment lately. i'm definitely a minority on these forums, but i also haven't spent a boat load of cash on failing equipment because of a name... and all my cheap crap still works... well. i think that's something our die-hard brand name followers should think about a little more.
from my experience the little guys (companies just starting out or making a name for themselves) are forced to produce better products to keep up with the big guys. complacency and mass production that comes with already having a big name often times is the demise of well known names. it happens in every industry. there are exceptions to the rule... but not forever.
eheim in particular seems to be on a downward spiral. we've had complaints about their heaters, their filters and their customer support. what i find funny is that so many filters have been bought and the clamps break and nobody seems to care. i understand being complacent with the engineering in certain aspects but a well engineered product just simply does not break at a critical point right out of the box.
needless to say, anybody can preach eheim to me all day long but it will be falling on deaf ears to say the least... tooooooo, toooooo many issues as of late.
i fear aquaclear filters may be going down the same road as i've seen the beginnings of their demise spring up lately too. with so many people who swear by them one can only hope the incidents will continue to be isolated ones or cease altogether. for me, i'll be waiting it out to see what transpires of that before considering one personally. my whisper 30-60 on the other hand is doing quite fine and i have 48 extra impellers just in case (12 for every size whisper hob available).
anyway, sorry to hear about your heater mishap. hopefully somebody can suggest something good as a replacement... or the manufacturer stands behind their product and does the right thing. sorry for the rant too. this is just getting my goat at this point... these companies make money hand over foot and seem to be preying on their followers lately.
better luck with the next one.