Well they appear to have a version of Marlin 1.1.07 on the bottom of the page. However saw no source code listed.
If you request they may give you the Marlin source Code. Looking at your power supply below do not believe you have enough power supply for a Heated Bed.

Power Input AC 110-220V, 50-60 Hz
Power Output DC 12V, 15A

They do however sell 110V Optional 3.4/6.8A 750W Silicone Heated Bed Heating Pad + LCD Thermostat For 3D Printers