Gravity is Good.
You are going to see a lot of suggestions for some real good high quality dehumidifiers that are pricey. Those are great options. One day I will buy a good one. But I'm very cheap and sometimes you buy what you can find locally. I've own/owned 5 dehumidifiers. Only 1 has failed (after 12 years). Here is the overly verbose details of each one. (There is a common theme - the pumps fail....a lot but gravity is good)
I had a Kenmore (name from the past) in our crawl space of our cabin with a pump. Dehumidifier lasted about 12 years of hard work but the pump part failed in about 2 years so I switched it over to the hose system to drain outside (made a little platform to raise the dehumidifier up for gravity to do the job).
When the Kenmore failed, I replaced it with a Midea Cube system. It has 3 options - pump, drain hose for gravity, or bucket. It was the best I could find locally up in the mountains. I don't remember when I got it. It was about 10 years ago? It has been running fine all this time. The pump part of it failed early so I switched it over to the drain hose. When this system fails, I'll probably spend some real bucks and buy a good one like you will see recommended here on GJ. But it was cheap and available and still working.
Then, 2 years ago, a tornado hit and threw a tree through the roof of our cabin. I immediately went to the local stores and the only dehumidifiers I could find were more of the consumer grade Mideas. I bought the last of the upright style 50 pint with pump and another Midea cube. I set them up in the loft that was now missing a roof and only had a blue tarp. Ripped up the carpet and those two Mideas worked non-stop (never cycled off) for 6 months and used their pumps the entire time. After the insurance settled and reconstruction was complete, I moved them to our primary residence and put them our basement garage with the pumps routed outside. Guess what - within 3 months, pumps failed. I took the pump inlet filters off, cleaned them, blew out the lines and they worked briefly. Realized I was wasting my time. Elevated them a little, hooked up the gravity hose and was done. I've had them running in the basement for a year and half after their half year running in the mountains 24/7.
At our coastal home in a flood zone on the marsh, I didn't even bother trying to use a pump. I bought a Toshiba 70 pint dehumidifier and hooked up the garden hose to the drain to route outside. Because we are in a flood zone and our basement garage is in the danger zone, all the electrical outlets are high on the wall and everything is elevated anyway so I built a platform for the Toshiba. It has been running perfectly for 5 years. It is set at 50% humidity and it does fantastic in the 1400 sq ft area. If not for that, our cars would be in a 80% humidity area (6 feet above sea level about 20 feet from a giant salt water marsh near the ocean on St Simons Island).
I know that there are better units than I have been buying but I'm getting long life out of these cheap units as long as I don't depend on the pumps. One of these days I'll buy a high quality unit (but will it outlast what I've experienced?).
