I do alot of data visualization these days and heatmaps are often a big part of that. I couldn’t find any good presets, so I decided to create my own. Hope you like them.

Instructions:
1) Download the grd file to load the gradients into your presets.

2) Select the brush tool, with the following settings:
skitch (1)

3) Make sure your layer style has this setting:
skitch (2)

4) Start drawing!

Source: Dribbble – Freebie: Heatmap Gradient Presets for Photoshop by Matthew Stephens