Portable electric heater: clearance and outlet safety
Keep combustible items at least 3 ft (about 90 cm) away, plug directly into a wall outlet, and switch it off when unattended.
Portable electric heaters can add warmth but create tip-over, overheating and fire hazards. The US CPSC advises a minimum three-foot (91 cm) clearance from combustibles and direct connection to a wall outlet, not a power strip or extension cord. Follow the appliance instructions and local electrical requirements.