Let's say they didn't install the radiant underfloor heating and decided to use space heaters instead. That's a small price to pay for Julie and Josh to have warm feet! Assuming the heat is on 20% of the time, it would cost $3.46 per month for radiant underfloor heating in this bathroom. There are 720 hours in an average month (24 x 30). 0.024 is the cost to run the heat mat for one hour. ![]() This is the most confusing part, I think, so let's review. To estimate the monthly cost, we enter the cost per hour, the number of hours in a month, and the % of time it runs. Let's say her thermostat cycles on for one minute every five minutes. Julie keeps her bathroom floor at a comfortable 78℉. There's a thermostat on the wall with a remote sensor in the floor and that cycles on and off as needed to keep the floor at your desired temperature. I told you the number would be surprisingly small. $0.024 that's dollars, or 2.4 cents per hour. I plug these numbers into my calculator to get the result. Next, I enter my average electric rate calculated above. That gets divided by 1,000 to convert it to 0.18 kilowatts. The website says our 1.5-foot by 10-foot mat uses 180 watts. So now we're ready to plug numbers into the formula. That comes out to $0.134, which is 13.4 cents per kilowatt-hour. To determine my electric rate, I divide my total charge $152.77 by KWH used 1,140. There are a lot of numbers with various rates, but don't get confused. Here is a snippet from my December 2020 electric bill. This number will be surprisingly small, but we're not done yet. ![]() For estimation purposes, let's make it simple and just divide the total charge by the total number of kilowatt-hours (kWH) you consumed.Ĭost Per Hour – Multiply the kilowatts by the rate per kilowatt-hour and the result is the cost to run your mat for a solid hour. Rate – Look at your electric bill and you'll see multiple charges that can be confusing. ![]() Household electricity is measured in kilowatts, so you need to divide watts by 1,000 to convert it to kilowatts. This should be listed on the website along with the prices of the mats. Watts – First, you need to know the wattage of your heating mats. You can do this before purchasing the system to get a good estimate of your operating costs. It's very easy to calculate the cost of running a single-mat radiant underfloor heating system. Watch the video to see how radiant underfloor heating was installed under tile in their master bathroom.
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