Hot-water radiators used in central heating systems use passive convection to distribute heat inside a room.
This is not very efficient, especially if they are mounted in the corner of the room.
For this reason, there are convector radiators that include a fan in order to improve the heat distribution and circulate higher volumes of air through the radiator blades.

In this alternative approach, standard radiators are upgraded to convector radiators using commercial off-the-shelf components (COTS) for 35€.

Step 1: Assembling the Fans

These 4 fans are Brushless DC Cooling Fan 7 Blade 24V 120mm x 120mmx25mm.
This type of fan is very silent and about the same width as the hot-water radiator. By joining 4 fans together, they cover almost the entire radiator length.

Fan characteristics:
- 7 Plastic Blades
- Speed: 1600 RPM
- Airflow: 58 CFM
- Noise: 38 DBA
- Rating: DC 24V, 0.20A

These 4 fans were bought online for a total of 13.20€, plus 10.10€ for shipping.

The structural strength is given by the cable ties that pass through the holes in the corner of each fan, and join the fans together.

<p>I added a 25C bimetallic sensor, so the fans only work when the radiator is hot(it's sound is quite annoying )</p>
Good Job!
For a long time he lived and worked in the North of Russia 1990-2007, in the city of Novy Urengoy. The house used this design to increase the heat transfer. Applied fans on 220 v.Спасибо reminded.
Does it reduced your bills? I have same heating system in my flat, and I have big problems with high costs of heating big rooms...
Convectors are more efficient at transfering heat, so it would be faster to warm up a cold room. In principle, it would take the same amount of energy, it would just be faster. <br>However, there are some efficiency gains by creating a warm air barrier near cold surfaces, such as windows. This is why radiators are usually near or under the windows and not on the oposite side of the room. By circulating warm air with the convector, it should create this warm air barrier and provide some energy efficiency.
This is pretty clever. Great work, and great post!

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