How to actually pick the right wattage for your bathroom heater
Here is a secret: buying the biggest, most powerful heater you can find isn’t the way to go. If you just go for raw power, you’ll end up wasting electricity or, worse, dealing with weird cold spots that make you shiver the moment you step out of the shower. It’s all about the size of your room. Small spaces (the powder rooms) If you’re dealing with a tiny bathroom—something under 4m²—you really only need a 250W to 400W lamp. I’ve seen people put high-wattage heaters in these little rooms, and it’s a mistake. The room gets hot way too fast, the thermostat panics and shuts it off, and then it kicks back on a minute later. It’s a constant, annoying cycle of “too hot, too cold.” Stick to the lower wattage. It’s much smoother. The bigger bathrooms Once you get into the 6m² to 10m² range, you have a choice. You could go with one big 800W unit, or you could split it between two 400W lamps. Go with the two lamps. Trust me. Why? Because heat distribution. With one big lamp, you get this one “hot zone” right underneath it, while the other side of the room stays freezing. Two lamps spread that warmth across the floor, so you actually feel cozy everywhere. A quick word on how this works These lamps use shortwave infrared. They don’t bother warming up the air like a traditional space heater; they hit your skin, the floor, and the walls directly. Because of that, where you put the lamp matters more than how powerful it is. If you mount a 600W lamp too high up, the heat loses its punch before it ever reaches you. You’ll be standing there wondering why you’re still cold despite the heater being on. The risk of going too high Sure, a 1000W lamp warms up fast. Really fast. But if you cram that into a small room with bad ventilation, the fixture itself can start to overheat. Plus, you have to make sure your wiring can actually handle that kind of load. If you push too much power into a tiny space, you risk burning out the internal filament because the heat has nowhere to go. Keep it balanced. Your wallet—and your wiring—will thank you.