The Eheim Thermocontrol+ e is a 250 watt WiFi-enabled aquarium heater. It is fully submersible, works in both fresh and salt water, and needs no readjustment once set.
Power: 250 watts
WiFi enabled
Fully submersible
Suitable for freshwater and saltwater
No readjustment necessary
Black
Use a separate thermometer to check tank temperature, and unplug the heater before any maintenance.