Well, I purchased about 15 Stealth heaters (different size) from DrFosterSmith the past few years .... Half of them went bad and I sent them back to Marineland for replacement. If you return the old stealth, they will ship you back the new pro model ... And you know what ? I have some of the smaller one shipped back to me ... In less than 2 weeks, that thing doesn't work more .. I used that in a hospital tank ... The light stays on green and the heater won't heat up ... I didn't notice that until I saw the fish being so inactive ... I touched the water and felt that it's stone cold .. Well, at least mine didn't explode ..
Let me tell you something else, for my other couple old stealth heater (that I use for storage barrel) .. these seems to leak electricity .. When I touch the water, I felt some shock .. that scare the heck out of me .. I am going to return them, along with the bad stealth pro ..
I am only using Jagar for my main tanks ..