Household · official-source review · reviewed 2026-10-10
A space heater looks cheap to buy and expensive to run, and the bill arrives after the cold week.
Turn heater watts, hours a day, and your electricity rate into a day, month, and year cost.
Anyone deciding how many hours to run an electric space heater this season.
Use the source document or official route that applies to your situation. This guide does not contact another person or verify external information.
Find the watts on the heater label. Use the running watts, not the marketing name.
Count the hours the heater runs on a normal day. Do not count the thermostat-off time.
Open a recent bill and find the cents per kilowatt-hour. Use the energy charge only.
Check the room for drafts before you add run hours. Seal the drafts first.
Set a daily run window that matches the cost you can accept. Turn the heater off when you leave.
A 1,500-watt heater runs 5 hours a day at 16 cents per kWh. The estimate is $1.20 a day and $438.00 in a full year.
Use your own source and details. The example is not a record about a real person or organization.
U.S. Environmental Protection Agency, Energy Star · reviewed 2026-10-10
What this source supports: Energy Star publishes efficiency criteria and estimated ranges for major appliances.
Source limit: Model-specific energy use varies. Read the EnergyGuide label for the exact unit you own or plan to buy.
These sources support the statements above. They do not show that every person needs this guide. They do not show a specific result.
This guide estimates cost from the label watts and your own rate. It does not measure use or suggest a heater.
Model-specific energy use varies. Read the EnergyGuide label for the exact unit you own or plan to buy.
Use current instructions from the responsible organization. This guide is a planning aid, not an official decision or a substitute for qualified advice.
Turn heater watts, hours a day, and your electricity rate into a day, month, and year cost.
This App estimates cost from the label watts and the rate you enter. It does not measure use or suggest a heater.
You enter every number yourself. The sources support the method and the limits. They do not produce a result for your specific case. Keep the original documents next to the sheet you build.
The App computes the worked example with your own numbers, in your browser.
APP 1
Turn heater watts, hours a day, and your electricity rate into a day, month, and year cost.
Free · no account · no upload
Open Space-Heater Running Cost CheckThe App runs in this browser. It does not send or save entries. Copy, download, or print only when you choose.
This guide uses short, direct instructions as an ASD-STE100-style writing target. It is not a formal certification.
Companion App: Space-Heater Running Cost Check. It runs in this browser and does not upload your entries.
This guide is edited for clarity and checked against the sources it links. It is not a substitute for official instructions or qualified advice. A linked source does not show that every person needs this guide.