In winter we often bring objects closer to the radiators for convenience: a towel to dry, a curtain that falls right in front of it, or perhaps a sofa placed against the wall. But these small daily gestures can cost us dearly.
According to some recent analyses, covering a radiator or obstructing air circulation can reduce heating efficiency by up to 40-50%. In practice, the heat remains trapped, the room heats up more slowly and the system is forced to consume more to compensate.
And it’s not just a practical question: science also confirms how free air circulation is essential for efficient heating.
A study published in Journal of Building Engineering in 2020, conducted by researcher Zongjiang Liu and his team from Peking University, analyzed the performance of low-temperature radiators. The results show that the heat output of radiators varies significantly when the flow of hot air is obstructed by objects or surfaces. In other words, if the heat cannot spread freely, the real temperature of the environment drops and energy consumption increases.
Furthermore, the study highlighted that, with good air circulation, the difference between theoretical and actual performance falls below 5% – a sign that a “free” radiator works almost at its maximum potential.
Objects that should never be placed near radiators
Let’s now see which objects most often compromise the performance of radiators and how to avoid them.
- Wet clothes or clothes to dry
It’s a very common practice: placing sweaters or towels on radiators to make them dry more quickly. In reality, this habit reduces the heat output of the radiator by up to half, because it blocks air convection. It is better to use a foldable drying rack to be positioned about 50 cm away from the radiator, so as to exploit the heat without obstructing it.
- Bulky furniture such as sofas, wardrobes or bookcases
A sofa or bookcase placed in front of the radiator prevents the heat from spreading evenly. Experts recommend maintaining at least 10-15 cm of free space between the radiator and any furniture. Not just for efficiency: also to prevent heat from ruining materials such as leather or wood, which can dry out and warp over time.
- Curtains too long or heavy
The curtains that cover the radiators create a “thermal barrier” that traps the heat between the fabric and the window. Result: the room remains cold and the radiator works harder to reach the set temperature. The ideal is to choose curtains that end just above the radiator or that can be easily moved when the heating is on.
- Shelves, plants or decorative objects above the radiator
A shelf installed too close to the radiator or objects placed directly on top of it can reduce heat diffusion and, over time, become damaged from excessive heat. It is better to leave at least 20 cm of space above the radiator and place books, plants or decorative candles elsewhere.
The 10 plants to NEVER put near radiators if you don’t want to see them die
Practical advice for improving the efficiency of radiators
Small gestures, but when added together they can make a difference on your bill and daily comfort.
After all, keeping radiators “free to breathe” is the golden rule for a warmer winter… and cheaper.
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