This image is a square with three vertical lines inside of it. These lines are slightly wavy and parallel and appear to signify the rising of warm air through a vent or furnace.
This Heating icon is made in flat color style
. This format was developed by Icons8 designer team and became immensely popular for use in web and mobile applications. Feel free to download this icon in PNG format for free, or unlock other formats for $5. Unlike other icon packs that have merely hundreds of icons, this monster icon pack contains 6,100 icons, all in the same style and quality.