It all depends if you can completely control the temperature with it. Temps need to be accurate and stable. Stop by our incubation section of the forums. Maybe someone is more familiar with this unit...https://www.backyardchickens.com/f/5/incubating-hatching-eggs
900W is pretty big...The GQF and Dickeys use a 225W element for the cabinet. If you are going to use it as your heat source, I'd say be sure to have a fan (or fans) with decent CFM to make sure you don't end up with hot spots in your cabinet. What are you using for temperature control?