Using LeafletEssentials.html, add a reference to Leaflet.heat.js with either a URL to a remote copy or the path to your local copy, as shown in the following code:

<script src="http://Leaflet.github.io/Leaflet.heat/dist/Leaflet-heat.js"></script> or,
<script src="Leaflet-heat.js"></script>

Add an array of points. Your points can contain additional information but must have the latitude and longitude as the first two elements. The following code shows you three points from the code. The full code contains many more, which will allow you to create the heatmap:

var points = [
[35.1555 , -106.591838 , "<img src='http://farm8.staticflickr.com/7153/6831137393_fa38634fd7_m.jpg'>"],
[35.0931 , -106.664177...