I run mine in TSM at about 80% and the noise is not too bad. Each one seems to have a slightly different sound, my older one maybe a shade louder. As far as heat goes, mine never get what I would call hot. Should not be a worry anyhow since they have a thermal sensor in the dry side that will shut it down automatically if the temperature limit is exceeded. All that money we pay for these goes towards some pretty useful design elements that a less costly pump does not have.
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