I used them when i first started up my Reef Tank I don't know for sure if I got a bad batch of pumps or what however I had two in my system a 4000 for circulation thru chiller, and 3 Lifegard filters and a 6000 for return pump all have been replaced inless than 3 months. Take my experience as the extreme.
thanks joncat, thats what i need quiet and no heat, I was also thinking of installing it dry thruogh a bulkhead, will this help or hinder the life, noise, heat?
if it is outside of the tank, the heat factor is almost nil. As far as noise, I would place it on some kind of rubber or neoprene to dampen the noise from vibration. An old mouse pad is great for that.
i have the 4000 for my return pump....very quiet....wattage is lower than most in the same class as well...its over a year old and knock on wood....no problems....i would definatly reccomend them.