Rail length, resistance type, and user-height notes from official spec sheets.
The Concept2 RowErg with standard legs is a 96 x 24 in61 cm air rower, 57 lb25.9 kg, 500 lb227 kg capacity, 54 in137 cm monorail, 14 in35.6 cm seat height, with a 5-year frame / 2-year parts-and-monitor warranty.
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Sunny’s SF-RW5515 is a folding magnetic rower at 81.8 x 18.9 x 23.6 in59.9 cm and 60.9 lb27.6 kg, with 8 resistance levels, a 53.4 in136 cm slide rail, and a 250 lb113 kg capacity.
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The Stamina ATS Air Rower 1399 is a folding home air rower at 77 x 18.75 x 22 in55.9 cm and 54 lb24.5 kg, with a 250 lb113 kg weight limit and a 3-year frame / 90-day parts warranty.
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The tall-leg RowErg is the same air erg with a 20 in50.8 cm seat height and 68 lb30.8 kg machine weight, still 96 x 24 in61 cm with a 54 in137 cm monorail and 500 lb227 kg capacity.
The Dynamic RowErg is a separate 76 x 24.3 in61.7 cm, 92 lb41.7 kg air erg with a 21.5 in54.6 cm seat, 500 lb227 kg capacity, and a moving carriage meant to mimic on-water boat physics.
WaterRower Original Oak is a water-resistance hardwood rower at 82.25 x 22.25 x 20 in50.8 cm, 63.5 lb28.8 kg dry, with a 700 lb318 kg max user weight and a 5-year frame / 3-year parts warranty.
WaterRower Club uses the same 82.25 x 22.25 x 20 in50.8 cm water-tank frame as other Original models, 63.5 lb28.8 kg dry, 700 lb318 kg capacity, with the Club two-tone wood finish.
Hydrow Origin is the 22-inch-screen electromagnetic rower at 86 x 25 x 47 in119 cm and 145 lb65.8 kg, with a 375 lb170 kg capacity and a 36 in91.4 cm inseam limit.
Hydrow Wave is the compact electromagnetic Hydrow: 80 x 19 x 43 in109 cm, 102 lb46.3 kg, 375 lb170 kg capacity, 36 in91.4 cm inseam, with a 16-inch screen.
Hydrow Arc is the current flagship electromagnetic rower at 86 x 25 x 48 in122 cm and 145 lb65.8 kg, 375 lb170 kg capacity, 36 in91.4 cm inseam, listed on the manufacturer page.
Ergatta Luxe is a cherrywood water rower at 86 x 23 x 41 in104 cm, 107 lb48.3 kg with water, 500 lb227 kg / 6'8" (40 in102 cm inseam) capacity, with a 21.5-inch game screen.
Ergatta Lite is the oak compact water rower at 82 x 23 x 38 in96.5 cm, 72 lb32.7 kg with water, 320 lb145 kg / 6'4" (38 in96.5 cm inseam) capacity, with a 17.3-inch screen.
The NordicTrack RW900 is a magnetic iFIT rower with 26 SMR levels, a 24-inch pivoting screen, 80.1 x 21.8 x 52.7 in134 cm footprint, and a 300 lb136 kg user capacity.
AssaultRower Elite is a fan/air rower at 92.5 x 20.1 x 48.6 in123 cm and 143 lb65 kg, with a 350 lb159 kg user limit and a 7-year frame / 3-year parts / 1-year labor warranty.
AssaultRower Pro is the stackable air rower at 92 x 22 x 45 in114 cm and 109 lb49.4 kg, with a 350 lb159 kg capacity and a 7-year frame / 3-year parts warranty.
Aviron Strong Go is an iPad-connected dual air/magnetic rower at 84 x 27 x 48 in122 cm and 105 lb47.6 kg, with a 507 lb230 kg capacity and about 6'8" height limit.
Aviron Strong Series is the 22-inch-screen dual air/magnetic rower at 84 x 27 x 48 in122 cm and 114 lb51.7 kg, with a 507 lb230 kg capacity and about 6'8" height limit.