S4 Performance Monitor

The S4 Performance Monitor can connect to a wide range of popular iOS and Android indoor rowing apps.

Fitted as standard to Original, S1 and M1 Series WaterRowers.


Looking for high-performance rowing data?
The SmartRow power meter precisely measures power output to provide in-depth data insights for every stroke.

Fitted as standard to the Performance Ergonometer.

Connect your S4 Performance Monitor with the Bluetooth ComModule.


Plugs into the back of the S4 Performance Monitor to enable Bluetooth connectivity.

Connect with the best indoor rowing apps. Learn more about compatible apps.

Sold as an accessory. The ComModule unplugs from the S4 to recharge its battery.

Phone and Tablet Arm

The Phone and Tablet Arm attaches to the WaterRower to hold your device while rowing.

Buy together with the ComModule and save with our Connect Experience Bundle


Fitted as standard to the Performance Ergonometer and available as an upgrade to all other WaterRowers.

Delivers, precise and in-depth data insights.

SmartRow is an intelligent power meter that provides a highly precise measure of WaterRower performance.

The electronics inside SmartRow measures absolute force and stroke length to calculate power output.

Performance data wirelessly transmits via Bluetooth to the free to use SmartRow app alongside a range of thirdy-party apps.

S4 Performance Monitor

ComModule required for Bluetooth connection.

LCD Display.

Compatible with all major Android and iOS indoor rowing apps.

Optical sensor measures rowing performance.

No mains power required.


Bluetooth ready.

iOS or Android device always required (no in-build display).

Links with the SmartRow companion app and a select rage of the third-party apps.

Intelligent power meter provides precise power data for every stroke.

No mains power required.

30 Day Return Policy

We’re confident you'll love the WaterRower, but if you're not entirely happy, return within 30 days for a full product refund.

0% Finance Available

A range of finance options are available*, from £22.48 per month.

Free Shipping

Free shipping on all orders over £50

Upgrade your WaterRower

Already own a WaterRower?

Both SmartRow and the S4 Performance Monitor can be fitted as upgrades to your WaterRower.