Both heaters arrived for the 125 gallon aquarium. Fully submersible (I wouldn't but anything else), and they look to be the quality I expected, with one exception: one of the tops of the heater looked to be popped out, so I popped it back in. I sure hope this does not affect the waterproofing of the heater.

These are Eheim 300 watt heaters. I always use at least two heaters for redundancy and better heat circulation.

Eheim 300w heater

Two Eheim 300watt heaters