The Drimaster-Eco CO2 (DRI-ECO-CO2) sensor measures carbon dioxide (CO2) levels in the home as PPM (Parts Per Million). This is an optional sensor that can be installed anywhere in the home, either with the supplied adhesive backing or with screws (screws not included). While the sensor and PIV (Positive Input Ventilation) unit communicate via radio frequency, the device itself must be wired into the property's main power supply. Due to the radio frequency capabilities of the DRI-ECO-HEAT-HC and DRI-ECO-NOX-HEAT PIV models, the sensor has been designed to work in conjunction with them.

If the CO2 level exceeds a preset level, the sensor sends a signal to the unit mounted in the loft to boost to provide additional ventilation and thus maintain healthier indoor air quality.

The Drimaster-Eco CO2 sensor (DRI-ECO-CO2) works with the Drimaster-Eco 4-way switch (DRI-ECO-4S) and the Drimaster-Eco relative humidity sensor (DRI-ECO-RH).