The previous stop sale on the larger size stealth pro heaters has now been upgraded to a full recall of not only these heaters, but also the smaller sizes, and the original Stealth heater in all sizes as well. Check out the link for more info. In summary though:
There's a contact for United Pet Group - the parent company of Marineland, where current Stealth heater owners can call for replacement or refund. If you have any questions, feel free to contact our fish staff at the store, but as for now, UPG (Marineland) is handling all the replacements/refunds directly with the consumer.
Link - Link to CPSC recall for stealth heaters.