Update (05-08-19): Well, both of my Rectorseal 83939 Aspen Mini pumps (I've got two of them) have stopped working properly again. I've checked the outlet drain lines, they are clear. And no, the drain line is not too elevated for the pump, it's within the specs that all the mini-split condensation pumps claim is ok. We've had a very mild winter, and at times some days got hot enough to have to switch my heat pumps (mini-splits) to A/C mode. The pumps worked fine throughout....that is up until about two weeks ago. I'm currently using a 5 gallon bucket to catch my condensation water (yes I know it's so ghetto, but I've put off buying more pumps until I can find a better solution.) This last failure (on both, on different days, but within about two weeks) was bad. The pumps were still "working" so they never initiated a shut-down of the mini-splits. So, water water everywhere .......love it....just love having to replace flooring!!! I love a mini-split heat pump. I think they are fantastic inventions that save $$$ on utility costs, but if you can't install on an outside wall, just don't do it!!!! For all of the energy and utility cost savings over the years, they've killed that by forcing me to replace flooring damaged by condensation water. (I'm going back with flooring that is water-proof). I'm not sure where to go from here. I've thought about some elaborate method for installing a drain line to catch and let gravity take to an external wall, or tie into my sewer lines somehow....but that will be equally difficult if not impossible without complicating the heck out of everything! Maybe I just have to get used to buying these once every two years and replacing before they fail!!! I swear I don't know anymore...... Update (06-29-17): Well I just received a warrany replacement on that "other brand" of condensate pump.....I've had two replacements on their internally mounted model and now one on an externally mounted one like this one here that I'm rating. Sorry EDC.....it is what it is...your pumps are incredibly quiet, and will move more more volume very quickly while doing it, but your pumps keep failing. Yes, the last part is me talking to the manufacturer's (Rectorseal's) competitor, EDC International. If it is in fact something I am doing wrong consider that the Aspen Mini has outlasted the other (EDC Limpet). I think I know why EDC won't sell on Amazon.....cause they know if you read real world reviews about their products, you wouldn't waste your hard earned money and labor (replacing these pumps can be hard on your air handlers plastic enclosure, leading to unwanted and unnecessary wear and tear on the air handler / evaporator itself). Ok, all that being said, don't hesitate to buy this, if you need a mini-split condensate pump. Updating to 5 stars....cut pieces of self adhesive velcro (the furry side:), and place all over backside of unit for vibration / sound dampening, or some other soft thing that will absorb vibration).....then you will give this Aspen Mini a 5 star rating too:-) One last thing.....if you can help it, try to mount a mini-split evaporator / air handler, on an outside wall for gravity fed, through external wall condensate drain exhaust to outside, in lieu of having to deal with ANY condensate pumps......but if you have case like mine and have no choice, get an Aspen Mini right now! Happy 4th of July, America's Independence Day! to all my fellow Americans! God Bless and be Safe :--) (Original review begins here:) This thing works fantastic. It appears that I will get very much trouble free operation out of it for years to come. My only complaint is that it is a bit noisy compared to other condensate pumps that I've used (except when they begin to fail - others I mean). I'm surprised that the manufacturer doesn't redesign this pump, so that a self adhesive backed noise dampening pad (provided with pump) could be installed behind the whole apparatus, as this would I think alleviate most of the vibration and noise. I have two mini-split systems, both with the air handler / evaporator mounted on an inside wall, which forces me to attach condensation pumps. I have used the inline ones that are mounted within the back of the air handler / evaporator unit since I first installed them, but those pumps have no filtration, and are not easily accessible even if they did. The lack of filtration leads to pump failure every time, which is why the Aspen is such a great pump. The Aspen Mini is very accessible, and the screen / filter can be pulled out and cleaned easily. I would recommend this to anyone that needs a reliable condensate pump for their mini-split system. (For comparison and redundancy sake, I have ordered and installed a different brand of externally mounted condensate pump on my other unit.... it takes up less space, and is very very quiet. I will come back to update this review and provide comparison over time, and will mention it's brand name later. For now I would rather not tell which one, because I don't have a good case for it yet, as it uses a different type of mechanism to engage itself, instead of a float system like the Aspen. It may prove to be more reliable, and if so I will state this in my review once this has proved to be true. I also am not sure about the other one, due to the fact that the water going into the water reservoir is not filtered going into it, but rather by the pump itself, which means that the electrical contacts which engage the pump can become dirty and affect the pump's operation over time. However it may prove to be a moot point, but I will come back and update my review of that one, and this one, at a later time.)
