Xiaomi's New Bathroom Heater Knows When You're In the Room
Xiaomi NewsThursday, 16 July 2026 at 10:06
Most bathroom heaters have two settings: on and off. Xiaomi's new Mijia Smart Bathroom Heater P1 Human Sensing Edition has a third: it decides for itself. The ceiling-mounted unit goes into crowdfunding in China next week at 999 yuan (~$148), combining lighting, heating, and ventilation into one device that automates all three functions using a 24GHz radar system.
Summary
- 24GHz radar presence detection: Detects continuous occupancy — not just motion — so the unit won't switch off if you stand still in the shower. Adjustable range and sensitivity prevent false triggers from people walking past the door.
- 3,000W graphene heating element: Variable frequency control maintains a set temperature without running at full power constantly. An oscillating louver swings 60–90 degrees to push warm air toward the floor.
- Dual DC motors: Allows heating and exhaust ventilation to run simultaneously. Exhaust rated at 259 cubic meters per hour.
- Retractable lighting panel: Up to 1,500 lumens, 3,000K–6,200K color temperature range, with a night light mode for low-light use.
- 999 yuan (~$148), crowdfunding next week: IPX4-rated wireless wall switch included, fitting standard 86mm electrical boxes with no new wiring required.
Why 24GHz Radar Over a Standard PIR Sensor
Cheap bathroom fans and heaters use passive infrared sensors. PIR sensors detect movement — which means they fail the moment you stop moving, often switching off the lights mid-shower. This is a common, frustrating problem that every bathroom exhaust fan buyer knows about. Xiaomi is using 24GHz millimeter-wave radar instead, which detects presence by measuring micro-movements like breathing. You can stand completely still and the unit knows the room is still occupied.
The sensitivity adjustment is the thoughtful addition. Radar is more penetrating than infrared — without tuning, it could detect someone walking past a closed door. Xiaomi's adjustable detection range prevents that.
Heating That Doesn't Waste Energy
The 3,000W graphene element heats quickly, but what keeps running costs reasonable is the variable frequency control. Rather than cycling between full power and off, the unit throttles output to maintain your target temperature. The oscillating louver distributes heat actively — swinging between 60 and 90 degrees directs warm air down where it's needed rather than letting it pool at the ceiling.
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The Installation Advantage
The included wireless wall switch fits a standard 86mm electrical box. That means you can add a physical control point without opening walls or pulling new wiring — a real-world installation benefit that most smart home ceiling units ignore. The unit ties into the Mi Home app and HyperOS ecosystem for scheduling, voice commands, and integration with other Xiaomi smart home devices.
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