Three sources of noise, in order of how much they matter
1. The resistance mechanism
Magnetic is silent. Genuinely — a magnet moving near a metal flywheel produces no sound whatsoever. Everything you hear on a magnetic rower comes from somewhere else on the machine. This is why every pick at the top of this page is magnetic.
Water is a whoosh. Paddles moving through a tank make a distinctive low-frequency sound, roughly the volume of a shower. Most people find it pleasant, and low frequencies transmit through walls less readily than the broadband noise a fan makes. It is not silent, but it is rarely the thing that causes an argument.
Air is a fan, and a fan is loud. There is no engineering around this: the machine works by pushing air, and pushing air makes noise, and the harder you row the more noise it makes. Air rowers are the correct choice for serious training and the wrong choice for a shared wall. Both things are true at once.
Hydraulic is quiet but hisses. Cylinders make a soft hydraulic sound. Quieter than air, less pleasant than water, and irrelevant next to the fact that hydraulic resistance drifts as the pistons warm.
2. The rail and the seat
On a magnetic machine the rolling seat is the loudest component. Two design details reduce it, and both are published specifications you can check:
- Covered rails.Sunny’s Dual-Rail model publishes protective coverings over its rails. Those covers are doing acoustic work, not decoration.
- Roller material. YOSUDA publishes PU rollers on its magnetic machine. Polyurethane on aluminum is quieter than steel on steel by a wide margin.
3. Impact into the floor
This is the one people underestimate, and in an apartment it is usually the one that matters most. The seat arriving at the end of the rail and the handle stopping at the finish both transmit force downwards. Your downstairs neighbor does not hear the flywheel — they hear a rhythmic thump through the ceiling.
No resistance type fixes this. A rubber equipment mat does, and it costs a fraction of the difference between any two machines on this page. If you live above someone, buy the mat before you optimize the machine.
What we would actually do
If quiet is your binding constraint, buy a magnetic machine with covered rails and put it on a mat. The Sunny Dual-Rail is the clearest expression of that specification at a sensible price: 16 magnetic levels, a published 50-inch rail, a stated 300 lb capacity and covered dual rails.
If you want the water sound rather than silence, the WaterRower Natural is the machine — and it has the useful property of standing on end in about two square feet when you are done.
If you were considering an air rower for the training quality, be honest with yourself about the living situation. The Concept2 is the better machine for training and it is the wrong machine for a shared wall. That is not a criticism of it.