This model comes Without Rf Control Functionality The DRI-ECO-HEAT-HCS is part of the Drimaster-eco range of Positive Input Ventilation (PIV) units and has a unique 400W heater element positioned behind the diffuser for optimum performance. The unit is suitable for all properties with a loft space and has a one power supply for ease of installation. With an integral heater sited behind the diffuser this element allows for the airflow to be tempered when entering the property. The DRI-ECO-HEAT-HCS provides whole home ventilation using the Positive Input Ventilation principle. Essentially the concept is to introduce fresh, filtered air into the dwelling at a continuous rate, encouraging movement of air from inside to outside. To achieve this, the unit is mounted in the loft space, drawing air through the filters and inputting it, at ceiling level, into the property. An integrated heater tempers airflow should the temperature in the loft space drop below a set point, ensuring ultimate comfort in the home.