How Much Does It Cost to Run a 1500W Space Heater for 8 Hours?
Estimate the daily and monthly cost of running a 1,500 watt space heater for 8 hours at common electricity rates.
Last updated: May 2026
Who this guide is for
This guide targets a very common space heater scenario: a 1,500 watt heater running most of an evening or workday.
What to compare
At $0.16/kWh, 1,500 watts for 8 hours uses 12 kWh and costs about $1.92 for one day. Monthly cost depends on how many days you repeat that pattern.
Buying guidance
Use the space heater cost calculator with your exact kWh rate and days used before choosing a heater or relying on one for daily heat.
Use the calculator first
Start with the related calculator, then use this guide to interpret the result. Sizes, costs, capacities, and product ratings should always be checked against current labels, reviews, and your actual room or aquarium setup.