Forget what the wattage rating on them is. Should be listed somewhere online though.
My friend is running a Coralife Super Luft. The larger of the two available. He's running 8 sponge filters, 2 bubble disks/wands all in seperate tanks(10 tanks total) using a couple gang valves. And honestly I think it could still handle more as I don't think it's straining at all.
Looks are deceiving with this pump. You'll say "I thought it was gonna be bigger" But it's honestly an awesome unit for multiple tanks. Worth the price it costs.