Cost to Run a 1500 Watt Space Heater
Estimate the cost to run a 1,500 watt space heater by hour, day, and month using your electricity rate.
Last updated: May 2026
Publisher
Published by EverydayCalc Editorial
Our calculator pages are built to show the formula, explain the inputs, provide examples, and highlight assumptions so readers can understand how each result is estimated.
Quick answer
Short answer
A 1,500 watt heater uses 1.5 kWh per hour on high. At $0.16/kWh, that is about $0.24 per hour, $1.92 for 8 hours, or about $58 for 30 days at 8 hours per day.
- Use your all-in kWh rate from the bill.
- Change the hours per day to match real use.
- Use space heaters as supplemental heat and follow safety instructions.
Try the calculator: Space Heater Electricity Cost Calculator
The simple math
Divide 1,500 watts by 1,000 to get 1.5 kW, then multiply by hours used and your electricity rate.
Why actual cost can be lower
A thermostat may cycle the heater off after the room warms up. If the heater runs continuously, use the full wattage estimate.
Compare before relying on it daily
Daily space-heater use can become a meaningful electric-bill item. Compare runtime, room insulation, and central heat before using it as primary heat.
FAQs
Quick questions
Do all 1,500 watt heaters cost the same to run?
At the same wattage and runtime, yes. Features change comfort and safety, but electricity cost comes from watts, hours, and kWh rate.
Can I run a space heater overnight?
Follow the heater manual and safety guidance. Use tip-over and overheat protection, keep clearance, and avoid damaged cords or overloaded outlets.
Sources
Source boxes list references used for factual claims, safety notes, energy rates, product-sizing conventions, or official data points.