How Efficient Is Electric Radiant Floor Heat? How Much Energy Does It Use?

Electric radiant floor heating systems are generally very efficient and use as much or less energy than other heating systems.

Most heated tile floors and electric floor heating systems use 12 watts per hour per square foot, meaning a 100-square-foot room would use 1200 watts in total every hour, or 300 watts LESS than the average space heater. A floor heating system would not only cost less to run in this scenario, but it would also heat the room evenly. The space heater, on the other hand, would make one side of the room hotter than the other.

You can easily estimate the power required to heat a particular room by following these steps:

  1. Calculate the square footage of the heated area in your space. You can get an estimate of this by multiplying the square footage of the whole room by 0.9.
    • Example: 100 sq ft  x 0.9 = 90 sq ft
  2. Next, multiply the heated area by 12 since most systems use 12 watts per square foot.
    • Example: 90 sq ft  x 12 watts per sq ft  =  1080 watts
  3. Now divide the total number of watts by 1000 to get the number of kilowatts the system will use per hour. (Kilowatts are the unit of measurement that electric companies charge by.)
    • Example: 1080 watts  ÷  1000 = 1.08 kilowatts
  4. Finally, multiply the number of kilowatts used per hour by how much the electric company charges per kilowatt in your area. The average cost per kilowatt-hour in the U.S. is $0.12, but it may be more or less in your area.
    • Example: 1.08 kilowatts  x  $0.12 = $0.13 per hour

In this example, a 90-square-foot system would cost $0.13 per hour to run. But remember: floor heating systems do not need to run 24 hours a day in order to keep a floor warm.

To make the radiant heat cost per month even more affordable, the best way to manage the energy use of your heated floor is with a programmable thermostat. There are tons of benefits of thermostats that can save energy and cost. Here are just a few:

  • These thermostats can be programmed to heat the floor only at the times of day that the system will be in use, and they learn to compensate for the heat-up time of your specific room. 
  • WiFi thermostats will allow you to control the temperature wherever you are. 
  • Radiant heat works like your furnace. If you set it to 73F, it will heat till it gets to that temp, then turn off until it gets cold enough to where it has to run again.
  • On top of that, you can use a programmable thermostat to run heat only when you need it. Say, before you get up in the morning for a shower. Then you can set it to a much lower temperature the rest of the day.

So invest in a programmable or a WiFi thermostat for energy and cost savings in the long run.

The best way to manage the energy use of your heated floor is with a programmable thermostat. These thermostats can be programmed to heat the floor only at the times of day that the system will be in use, and they learn to compensate for the heat-up time of your specific room. Better yet, WiFi thermostats will allow you to control the temperature wherever you are. So invest in a programmable or a WiFi thermostat for energy and cost savings in the long run.

7 thoughts on “How Efficient Is Electric Radiant Floor Heat? How Much Energy Does It Use?”

  • Lyle V. Wood says:

    To save on the electric bill – should I turn up the electric floor heating system (only on during off-peak hours) to a comfortable temperature -say between75-78- and not use baseboard electric heaters at all

    OR

    should I turn down the floor heat to -say 67- and use the baseboard heaters to warm each room I am using? Thank you/cheers/hsw

    • matthew@warmyourfloor.com says:

      Hi Lyle,

      When determining which heat source to use that will save you money on your electric bill, it comes down to which source using the most power.

      I don’t know how much power your baseboard heaters use per hour but the floor heating system is likely generating 0.012 kilowatts per square foot an hour.

      So if you have a 100 square foot heated area, it would be generating 1.2 kilowatts per hour.

      Once you know which source uses less power, that’s the heat source you should be using.

      Hope this helps Lyle!

    • matthew@warmyourfloor.com says:

      Hi Bart,

      How many hours a day you choose to run the system is entirely up to you.

      Many customers use the programmable function on their thermostat to have the system turn on/off at certain times of the day.

      Some will simply leave the system running all winter long, just depends on how you like to use your system.

  • It’s really helpful to hear that Electric Radiant Floor Heating is worth and provide a great level of comfort. I was confused between Electric and water based floor heating system. Looking for solution just checked your post and it helps me a lot to take decision. I have decided to install electric radiant floor heating as it is easy to install and also easy to maintain and provides a great level of heating and comfort.

  • LS
    Thanks for this information. I think it will be even more clear if you use kWh throughout, for instance as the unit of measurement that electric companies charge by. The electric floor heating systems use 0.012 kWh etc. Using Watts (J/s) confuses.
    Regards,
    Erik

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