Three published figures and one judgement decide this. Here is what the makers print about the five picks.
Published resistance type, machine weight, length, storage method and user weight capacity for the five picks on this page| Machine | Resistance | Machine weight | Length | Storage as published | Capacity as published |
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| MERACH Q1S | magnetic | 58.9 lb | 65 in | Uprightable, built-in base wheel | 350 lb |
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| YOSUDA Magnetic Rower | magnetic | 43 lb | 57.9 in | Uprightable | Not published |
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| Sunny Health & Fitness Smart Compact Hydraulic Rower | hydraulic | 22.4 lb | 58.1 in | Compact, no assembly storage mode | Not published |
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| Sunny Health & Fitness Smart Dual-Rail Rower | magnetic | 68 lb | 79.3 in | Uprightable | 300 lb |
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| Concept2 RowErg | air | 57 lb | 96 in | Separates into two pieces; 25 x 33 x 54 in stored | 500 lb |
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1. The mechanism, because it decides what kind of noise you make. Magnetic resistance is a brake acting on a flywheel with nothing moving air, which is why three of the five picks here are magnetic. Air resistance is a fan: it is the loudest mechanism in the category by a wide margin and the noise rises with your effort, which is exactly backwards for a shared house. Hydraulic is quiet because there is barely anything to make noise. Water sits in the middle and is the pleasantest sound of the four, but it is still a sound, and it is a sound at nine o’clock at night. The full comparison is on best quiet rowing machines and the mechanism in air vs magnetic.
2. The rail, because that is the sound that travels downward. The thing the room below hears is not the flywheel. It is the seat carriage running the length of the rail twenty times a minute, arriving through the floor rather than through the air, and no change of mechanism fixes it. Two things reduce it: a dense mat under the whole footprint, which is the single highest-return thing you can buy for an upstairs rower, and a slower, smoother stroke. Our own routine for the rail and rollers is in rowing machine seat rollers, the mat question is settled in do you need a mat under a rowing machine, and the rest of the quieting is in how to make a rowing machine quieter.
3. Machine weight, which is both the floor and the staircase. Sunny’s compact hydraulic rower is 22.4 lb, which is a one-handed carry. The YOSUDA magnetic is 43 lb and the MERACH Q1S 58.9 lb, both of which one adult can manage with a rest halfway. The Concept2 is 57 lb but separates into two pieces, which is a different and easier proposition on a turning staircase than a single 57 lb object. Above about 70 lb, assume two people — and note that the boxed weight is higher than the machine weight, so the box comes upstairs before it is a machine. Our assembly notes are in how to assemble a rowing machine.
4. Whether it stands up when you are done. An upstairs room is almost always a room with another job, so stored footprint matters more than footprint in use. Every pick here publishes an upright or compact storage method: the Q1S has a base wheel, the YOSUDA uprights, the Sunny hydraulic needs no assembly step to put away, and the Concept2 separates into a 25 by 33 by 54 inch stack. What none of them publishes is the ceiling height needed to upright it, so measure that yourself before you commit — the arithmetic is in space requirements.
The case against the obvious pick
The Concept2 RowErg is the better machine and it is last on this list, which deserves an explanation rather than a footnote. It is 96 inches long, which is eight feet of floor in a room that probably has a bed in it. It is an air rower, so it is the loudest option here and gets louder as you work harder. And Concept2 itself publishes a recommended 9 ft by 4 ft space, which is a great deal of a spare bedroom. All of that is survivable if the room below is a kitchen, a garage or nobody. If it is somebody’s bedroom, buy a magnetic machine and accept the smaller flywheel — the full version of that trade is on best rowing machines for apartments.
One thing we will not do is tell you a specific machine is safe on your specific floor. Floors differ, joist spans differ, and a hundred-year-old conversion is not a new build. What we can tell you is the published weight of each machine, which is the number a builder would ask you for first.
How to choose in one paragraph
Buy the MERACH Q1S for a first-floor room with someone underneath: magnetic, 58.9 lb, 65 inches, published 350 lb capacity. Buy the YOSUDA magnetic if the room is genuinely small — 57.9 inches and 43 lb. Buy Sunny’s compact hydraulic rower if the machine has to go up and down the stairs regularly, because 22.4 lb is the only weight on this page you will not resent. Buy the Sunny dual-rail machine if you are tall enough to need its published 50-inch rail and can take 68 lb up there once. And buy the Concept2 RowErg if nothing lives below you, because then none of this page applies and you should just buy the best machine. Whichever you choose, buy the mat at the same time.