The WaterRower and Concept2 RowErg are the two most respected home rowing machines in the world. Both cost around $1,000. Both deliver excellent workouts. But they're built differently, feel different, and suit different priorities.
The Core Difference: Resistance Mechanism
Concept2: Air flywheel. A chain drive spins a cage fan that creates wind resistance. The harder you pull, the more air resistance you encounter. The response is instant and athletic -- it feels like real rowing.
WaterRower: A water tank with paddles. Pulling the handle spins paddles through actual water. The resistance increases smoothly with force -- not as dramatically as air, but with a more fluid, dampened feel.
Workout Feel
Rowing a Concept2 feels technical and athletic. The air resistance is highly responsive -- a harder pull immediately creates more resistance, making intervals feel sharp and precise.
Rowing a WaterRower feels meditative. The water sloshing sound is pleasant, the resistance is smooth and consistent, and the stroke feels heavier but more forgiving. Many people find it easier on joints and more enjoyable for longer sessions.
Noise Level
Concept2: Noticeably loud. The fan creates consistent wind noise at any pace. At sprint pace it's genuinely loud. Not ideal for apartments, early morning sessions, or households where noise matters.
WaterRower: Quieter overall, with a rhythmic water sound that many users find pleasant. Still audible but meaningfully less intrusive.
Data and Tracking
Concept2 PM5: The gold standard rowing computer. Tracks split, stroke rate, watts, distance, calories, and heart rate. Connects to every rowing app. The global Concept2 rankings board creates community competition.
WaterRower S4 Monitor: Functional but simpler. Tracks the essential metrics. Not Bluetooth-compatible natively -- the WaterRower app is separate and requires an add-on. Fewer data integration options.
For people who follow structured rowing programs, train for erg competitions, or want to track and compare workouts rigorously, the Concept2 PM5 is meaningfully better.
Build and Aesthetics
WaterRower: Beautiful. Natural ash or walnut wood construction. Stores vertically (footprint of a barstool when upright). A conversation piece.
Concept2: Industrial and functional. Black steel monorail, orange accents. Stores horizontally in two pieces. Gym-equipment aesthetic.
Who Should Buy Each
Buy the Concept2 if: You're serious about tracking progress, follow rowing programs, plan to compete in erg challenges, or want the most athletic rowing feel.
Buy the WaterRower if: Aesthetics matter, noise is a concern, you prefer a more meditative rowing experience, and you're not interested in data-driven training.
Both are excellent. Neither is wrong. The Concept2 is the performance choice; the WaterRower is the lifestyle choice.