A radiator fan uses a small electric fan to move warm air away from an existing heated radiator or convector and into the room. The heat itself continues to come from the connected heating system; the fan primarily changes how quickly and where that available heat is distributed.

This distinction is important when comparing heating products. A radiator fan is an accessory for an existing compatible heat source and should not be selected as a substitute for a fan heater, convector or other appliance that generates its own heating output.

Before choosing a radiator fan, check the construction of the existing radiator or convector and the space available around it. The fan must be positioned so that it can draw in air and direct the warmed airflow into the room without obstructing the radiator or surrounding components.

Do not assume compatibility from radiator width alone. Check the available clearance, suitable mounting or standing position and whether the magnetic attachment system can be used securely with the specific radiator design.

The current TVH 3 mono system is designed as a compact solution for radiators approximately 50 to 70 cm long. For larger radiators or convectors of approximately 70 to 120 cm, the system can be supplemented with additional TVH 3 fan units.

Radiator length is useful for initial system selection, but it is not the only criterion. Also consider the radiator construction, available mounting space and how the warm air should be distributed across the room.

The TVH 3 uses adjustable magnetic feet to adapt the fan to different radiator and convector installations. Depending on the construction of the heat emitter, the fan can be positioned in a suitable location below the radiator or supported on its magnetic feet.

Check that the selected position is stable and leaves sufficient space for unobstructed airflow. The fan should be installed only in a configuration supported by the product design rather than forced into a radiator where the available space or attachment points are unsuitable.

The current TVH 3 system uses a temperature sensor attached close to the heating-water flow of the radiator. When the measured temperature reaches approximately 30 °C, the fan switches on automatically; when it falls below approximately 25 °C, the fan switches off again.

The switching points have a stated tolerance of ±5 °C. This automatic control allows the fans to follow the heating cycle without requiring manual switching each time the radiator warms up or cools down.

The TVH 3 system can be expanded when one fan unit does not cover enough of a longer radiator. Up to five fan units can currently be combined and operated through one shared mains connection and one temperature sensor.

The TVH 3 extension set is intended to expand an existing system and should not be confused with the complete base unit. When planning a multi-fan installation, check the number of required units, cable routing and the position of the common temperature sensor before installation.

Each current TVH 3 fan unit provides a maximum airflow of 51 m³/h and is specified with a sound pressure level of 18 dB(A). These values help you assess how much air movement a unit provides and whether the operating sound is suitable for the intended room.

When several fan units are combined, do not assume that the complete installation has exactly the same acoustic behaviour as a single unit. The perceived sound can depend on the number of fans, their position, the radiator construction and the room environment.

The TVH 3 requires electrical power for the fan even though the radiator provides the heat. The current base unit has a rated power consumption of 1 watt and is supplied via the included power adapter and USB-C cable connection.

Extension units also require 1 watt per fan and can share the base system's power supply within the supported configuration. Plan the cable route so that the power connection and sensor cable can be installed safely without interfering with the radiator or surrounding area.

A radiator fan can move available heat into the room more quickly and can help reduce temperature differences around the radiator. However, the fan does not create additional thermal energy or increase the rated heating output of the existing heating system.

Whether the changed heat distribution reduces total heating energy consumption depends on the complete system, room conditions, thermostat behaviour and how the heating is operated. Avoid treating a radiator fan as a guaranteed energy-saving measure or assigning it a fixed percentage reduction in heating costs.

Start with the existing radiator or convector and check whether the fan can be positioned securely with unobstructed airflow. Then determine the number of units and controls required for the installation.

• Check whether the radiator or convector design provides a suitable position for the fan system;
• Measure the radiator length and the available space below or around the heating surface;
• Verify that the magnetic mounting or supported standing position is suitable for the specific installation;
• Choose the number of fan units according to the radiator length and required airflow distribution;
• Position the temperature sensor as specified so that automatic switching follows the radiator temperature correctly;
• Check airflow and sound data when the system will be used in bedrooms, offices or other quiet rooms;
• Plan the power supply, USB-C connections and cable routing before installing several fan units;
• Treat the radiator fan as an air-distribution accessory rather than an additional source of heating output.