What usually causes this?
Loose connection
The most common cause. Loose terminals create resistance and heat.
Overload
Space heaters, hair dryers and other high-wattage devices can overload an outlet or circuit.
Worn outlet
Weak internal contacts create heat where the plug connects.
Undersized or damaged wiring
Wire too small for the load heats up.
Aluminum wiring
Aluminum wiring on devices not rated for it can overheat.
What you can safely check
These details help an electrician find the cause faster. Look and listen only — do not remove covers or touch wiring.
- Whether the outlet is warm with nothing plugged in
- What was plugged in and how long
- Discoloration or melted plastic
- Warmth at the plug itself
- Other warm outlets on the circuit
Warning signs that need a professional
- Hot with nothing plugged in
- Brown or black discoloration
- Burning smell
- Plug gets hot or deforms
- Breaker trips with heat
When should you call an electrician?
Call an electrician for any outlet that's hot, discolored or warm without a load. They'll check the outlet, its connections and the circuit load — and recommend a dedicated circuit if you're regularly running a high-draw appliance there.
Space heaters are a common cause. They're safest plugged directly into a wall outlet on a circuit that isn't shared with other heavy loads.
Services that fix this problem
Electrical Outlet Repair
Fixing dead, loose, warm, sparking or scorched outlets — and the wiring problems behind them.
Electrical Wiring
New circuits, repairs to damaged wiring and wiring updates for kitchens, additions and major appliances.
Electrical Repair
Diagnosis and repair of dead circuits, failing outlets and switches, tripping breakers and other everyday electrical faults in your home.
Emergency Electrician
Urgent help for burning smells, sparking, hot panels, water-exposed wiring and sudden loss of power at home.
Related electrical problems
Frequently asked questions
Slight warmth at the plug of a heavy appliance can happen, but the outlet itself shouldn't be hot. Heat usually means a problem.
Yes. Heat can melt insulation and ignite nearby materials.
Space heaters draw a lot of current for long periods. Loose connections or worn outlets heat up under that load.