Could a Radiator Be Slowing Down My Wi‑Fi, and Is It Safe to Cool the Router?

Start with a few speed tests at different times and compare the results with your subscribed plan. Check whether all devices are affected, how many smart devices are connected, and whether a wired connection is faster. Restarting the router occasionally is fine, but if the slowdown is consistent even over Ethernet, contact the internet provider rather than trying to cool the hardware.

You can safely experiment by relocating the router, but not by putting it in a fridge or near melting ice. Leave ventilation around it, keep it dry, and don’t cover it with insulating materials. A nearby radiator may be worth ruling out simply because moving the router is easy and carries no risk.

Wi‑Fi interference is another common possibility. Nearby networks may be crowded on the same channel, especially on 2.4 GHz. Try changing the router’s channel or letting it select a clearer one, and test both 2.4 GHz and 5 GHz if available. Moving the router away from the radiator, metal objects, large appliances, and enclosed spaces can also help.

Don’t use a refrigerator, ice, or water. A fridge would block and weaken the wireless signal, and cold hardware can develop condensation when exposed to warmer air, which can damage electronics or create a shock hazard. The sensible fix is simply to move the router away from the radiator and keep it in a dry, open, well-ventilated spot.

Heat could contribute if the router is genuinely running hot, but a radiator usually won’t directly make the internet slower unless it’s affecting the router’s temperature or blocking the signal path. If the router isn’t unusually hot, the timing may be coincidental. Test the connection with a wired device, then compare that with Wi‑Fi on several devices. That will show whether the issue is your internet service or just wireless coverage.