What it actually does
The concept is simple enough. Warm air from your radiator rises and mostly gets stuck near the ceiling while your feet stay cold. A fan booster sits on the radiator, catches that heat, and pushes it outward into the room. The Valiant version does this with three fans in a row, runs on a rechargeable battery (no plug needed, which is genuinely handy), and sticks to the radiator magnetically. No drilling, no cable management headaches.
I tried something similar in a narrow hallway last winter. The difference was noticeable within about twenty minutes, that draught-free warmth spreading low rather than hovering above your head. Not dramatic, but real.
Who this suits and who it doesn't
Honestly, this is a solid pick if you have:
- A single cold room that never quite heats up properly
- A radiator that runs but doesn't circulate well
- Rented accommodation where you can't touch the heating system
It's not going to replace a properly balanced heating system or fix a boiler that's on its last legs. And if your radiator is tucked behind a big sofa, the fan helps less than you'd hope. The magnetic fit also assumes a steel radiator, so aluminium ones are out.
The honest verdict
At under thirty quid, the Valiant triple fan is not half bad for what it is. Quiet enough to forget it's running, no wiring faff, and the rechargeable battery means you can move it room to room easily. My only reservation is longevity. Budget radiator fans can feel a bit flimsy after a season or two. But as a low-effort fix for a stubborn cold spot, it's a reasonable shout.
