A fan heater needs 2,000 watts, a USB heated blanket only 10. If you only warm yourself in the evening, you save significantly. We have recalculated exactly how much – and when it pays off.
Why heat an entire room when you are only sitting on the sofa?
A fan heater warms the air in the entire room – including the corners where no one sits, and the heat that escapes through walls and windows. A heated blanket, on the other hand, brings the heat exactly where you feel it: directly to the body. That is why 10 watts are enough for it.
The comparison: fan heater versus USB heated blanket
Calculation example with an electricity price of €0.35/kWh, each on the highest setting:
| Fan heater (2,000 W) | USB heated blanket (10 W) | |
|---|---|---|
| Per hour | 2 kWh ≈ €0.70 | 0.01 kWh ≈ 0.35 cents |
| Per evening (4 hrs) | 8 kWh ≈ €2.80 | 0.04 kWh ≈ 1.4 cents |
| Per winter (180 evenings à 4 hrs) | 1,440 kWh ≈ €504 | 7.2 kWh ≈ €2.52 |
Anyone who has heated for four hours every evening with the fan heater and instead uses the USB heated blanket saves around €500 per winter in this example – which corresponds to about €80 per month. If it is only two hours a day, it is still around €250 per winter.
And what if you heat with central heating?
Even then, the blanket pays off – via the thermostat. According to the German consumer advice center, the rule of thumb is: Every degree less in room temperature reduces consumption by about 6%. According to Heizspiegel 2025, heating a 70 m² apartment with gas costs on average around €1,180 per year. From this results:
- 1 °C less: approx. €71 per year
- 2 °C less: approx. €142 per year
With the heated blanket over the shoulders, 19 °C quickly feels like 21 °C – and the blanket only costs cents.
Important: Your rooms should still not be completely cooled down. Heating too little increases the risk of mold. The German Environment Agency recommends up to 20 °C in living areas, 18 °C in the kitchen, and 17 °C in the bedroom – and airing out more frequently in cooler rooms.
Where the USB heated blanket is particularly worth it
- Home office: warm at the desk, without heating the study room all day.
- Sofa and reading nook: as a lap blanket or shoulder throw.
- On the go: with a power bank on the balcony, in the stadium, or while camping – also as a cape via zipper.
Good to know
- Operation via USB with 5 V – preferably with a power bank or a power supply with 5 V / 2 A.
- With a 5,000 mAh power bank, the blanket warms for about 1–5 hours depending on the setting.
- 3 heating levels with digital display, carbon fiber heating wire in 8 heating zones.
- Washable: remove the cable and put it in the machine in a laundry bag.
Conclusion
Heat where you are – instead of the entire room. Anyone who sits a lot in the evening, works in a home office, or previously reaches for the fan heater saves significantly every winter with a USB heated blanket.
→ To the portable USB heated blanket – 150 × 80 cm, 6 colors, €49.95. For warm nights, there is the Winter Set with Heated Mattress Pad.
All values are example calculations. The actual savings depend on your electricity and heating price, your apartment, and your usage.