well then, from personal experience....
loudness...
not terrible, but not silent. i reccomend some sort of vibration reducing pad underneath.
warmth...
not sure, had an 80mm fan blowing over it, barely warm to the touch.
reliability....
mine failed after 8 months of intermittent use. was not happy considering people have had eheims running for 5years straight with no problems.
in short, i was disappointed. i thought that the L30 was a better deal than the eheim 1250. perhaps the old saying, you get what you pay for applies.
ps, it can be submerged...
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