Home energy & efficiency
Space Heater Cost Calculator
See what running a portable space heater actually costs, and check whether the circuit it's on can handle it.
1. Heater & Usage
2. Running Cost
kWh × rateMONTHLY COST
$—
SEASONAL COST (4 months)
$—
Circuit check: a 1500W heater draws 12.5A — close to the 80% continuous limit of a standard 15A circuit (12A). Never run it on a circuit already carrying other loads, and never on an extension cord rated below the heater's draw.
Space heater safety basics
- Plug directly into a wall outlet — never into a power bar or extension cord unless it's rated for the heater's full draw.
- Keep at least 3 ft of clearance from anything flammable (curtains, bedding, furniture).
- Never leave running unattended or overnight in an occupied bedroom.
- Look for a model with tip-over and overheat auto-shutoff.
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