A dehumidifier pump is a necessary item for any dehumidifier owner to have. They essentially pump the collected water out of the reservoir so that you do not have to carry the reservoir or manually empty it out yourself, both of which can be a huge hassle. While this is a rather niche item, there are a wide variety of brands and styles to choose from. Some work better for larger dehumidifiers, while others are useful for smaller variations.
One thing to keep in mind about purchasing a dehumidifier pump is that it is absolutely imperative that you read reviews from other people who have purchased specific models. Some cheaper models can leak easily -- and that could completely ruin your flooring wherever you place the pump in your home. Quality is very important with these machines, otherwise you could be looking at a huge mess to clean up and even some repair bills to pay.
The pump needs somewhere to run the water that is taken from your dehumidifier, so it is recommended that you have somewhere safe nearby to lay the outgoing hose to drain.
The engine inside the pump is very important. Cheaper and lower quality models will have an engine that is unprotected from the water it is extracting, which can cause it to stall and leave the water inside the dehumidification system. If it is stalled for too long your dehumidifier could fill up and stop working until you have discovered the problem. Better models have protected or powerful engines that are not at risk from being waterlogged or damaged by the intake. It is much better to purchase a more expensive dehumidifier pump and not have to repair it than it is purchase a cheaper one and have to have it repaired a few months to a year later.
Some are also automatic so that they do not drain water when the dehumidification system is close to being empty; they only drain when it is nearing full capacity. This can save hundreds of dollars on power bills a year alone, not to mention the convenience of not having to manually turn it on and off yourself.
If you are looking to get a dehumidification system for your whole home, it is going to be a good idea to invest in a pump as well. Without it, you will find that it is difficult, almost impossible, to have to empty the system's reservoir out on your own. Save yourself the effort and the aching joints and try a dehumidifier pump. They come in various price ranges, and they take a giant chunk out of the hassle of owning a large dehumidifier.