I need to do research on it but I think it's the same heater or should I say heater's as I had..yes had alot of problems with petsmart heaters.
Basically they all worked bad, and yes they made this awful rattling sound and barely heated anything. I brought them back, and then made a rule to never get fish supplies from them again.
A heater is not really something you wanna go cheap on, get a good one and u can leave the house with a clean conscience and not worry all day for ur fish.
I recommend, and alot of the other member's recommend this heater too:
its the Hydor Theo line.