It's a rowing machine where you pull a cable and slide on a track, but instead of mechanical resistance, the resistance comes from a blade turning through a water tank at the front of the machine. It makes a satisfying whoosh of sound with every stroke.
WaterRower Rowing Machine - Indoor Rowing
Pros: Well built, long lasting, can stand up in a corner when not in use, smooth operation with smooth and "organic" transmission chain. My son uses it every day at like 5 in the morning, and that sound blends with my morning dreams since I get up at 6 or 6:30.
Cons: very little variable resistance - to add resistance, you need to add more water, but it only goes up to a certain point. Also, the bar is narrower than I would like, but since I row with Monkey Grip and a weightlifting strap on each wrist to spare the joints on the hands and wrists for music, I can get around that just fine.
This is fine for us, because we are basically looking for a cardio/core alternative to the Elliptical. Also, for me, after a herniated L4-L5 episode a few years back my McKenzie therapist noted that I looked like my front was way more developed than my back and suggested rowing as a way to get better balance. After some research, we bought the water rower and all three of us use it regularly. We love it, but it's not the same as rowing in a body of water!
Here are some pics of our little 3rd floor workout room. There were taken at night, but the windows face east and in the morning the room is full of natural light.
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EDIT: But again, I'm not trying to "gain" anything at this point...just trying to slow the descent while the inevitable human "coming down the mountain" paradigm of physical decline plays itself out. Thankfully, I have a few more years to still gain in terms of musical chops, so I'll try to content myself with that.