Getting Your Bathroom Heater Wattage Right
If you’re picking out infrared heaters for a bathroom, the IP44 rating is your starting point. It’s basically the “safety first” rule—it keeps the splashes out and makes sure nobody accidentally pokes a finger into a live wire. But once you’ve got the safety part sorted, the real trick is the wattage. You don’t want to waste power, but you also don’t want to be shivering while you dry off.
How the heat actually works
Here is the thing about infrared: it doesn’t really “warm up the air.” Instead, it heats up whatever it hits—the walls, the floor, and you. In a tiny powder room (anything under 4m²), you don’t need a monster. A small lamp around 250W to 400W usually does the trick. If you go overboard in a space that small, you’ll end up with one scorching hot spot while the rest of the room stays damp and chilly. It’s just too much heat for the space to handle. But if you’re dealing with a medium or large bathroom (somewhere between 6m² and 12m²), you’ll need to jump up to 600W or even 1000W. If you try to skimp here, the heat just vanishes before it even reaches the middle of the room. You’ll find yourself leaving the heater on way longer, which kills the filament faster and makes your electric bill jump.
The hidden catch
That IP44 casing is great for protection, but it can also trap heat around the lamp. I’ve seen people put way too much wattage into a small room, and the housing gets so hot it actually triggers the thermal cut-off. It just shuts down. You have to make sure the lamp isn’t producing more heat than the enclosure can actually get rid of.
A quick cheat sheet
If you’re staring at a spec sheet and aren’t sure what to pick, try this: ***Tiny rooms (<4m²):**Stick to 250W-400W. Keep it targeted. ***Medium rooms (4-8m²):**600W is usually the sweet spot for coverage and cost. ***Big rooms (>8m²):**Go for 1000W+, or better yet, a couple of 600W units. Spreading them out stops those annoying “hot and cold” zones. One last tip: give it its own dedicated circuit. These lamps pull a lot of current the second you flip the switch. If you try to daisy-chain them on thin wiring, you’re probably just going to trip the breaker.