Essentially, the water rower uses water as it's resistance and the air rower (click here to read our air rowing machine reviews) uses air resistance. Additionally, the resistance of the water gives a very similar feeling to actually rowing in the water. The rowing machines listed above all have fantastic rowing mechanisms that mimic the exact feeling of a rowing a boat.
Noise level is another large factor that tips the scale more towards water rowers. Air rowers make a fairly loud “whooshing” noise every stroke, which makes them bad for people who like watching TV, have sleeping children, live in apartments, or like working out early in the AM. Water rowers do make some noise but the splashing of water in the tank is a lot quieter and more soothing than the fan noise produced by air rowers.

Velocity Exercise puts a premium on comfort here with a polyurethane molded saddle seat, and magnetic drum resistance contributes to a row machine that is durable, won’t need much or any maintenance, and, as we mentioned does not create much noise in use. This makes it easy to row while watching TV or listening to music. It also means the other people in your home won’t be listening to you workout quite as much. Easy to assemble and store, the Velocity Exercise Magnetic Rower CHR-2001 is a good choice for a mid-priced rower.  Click here to read the full review.
In sweep or sweep-oar rowing, each rower has one oar, held with both hands. This is generally done in pairs, fours, and eights. In some regions of the world, each rower in a sweep boat is referred to either as port or starboard, depending on which side of the boat the rower's oar extends to. In other regions, the port side is referred to as stroke side, and the starboard side as bow side; this applies even if the stroke oarsman is rowing on bow side and/or the bow oarsman on stroke side.