2 reviews
Aquarium heaters, taken apart
A heater keeps tropical fish in their temperature range. Size it by the manufacturer's chart and check the water with a thermometer.
Each review below takes one product apart and lists what works and what doesn't before you buy.
Temperature equipment
EHEIM Jäger 100 W
A 100 W adjustable glass heater. EHEIM’s manual chart lists this model for 100–150 L, which includes 120 litres. The manual also requires regular water-temperature checks.
Temperature equipment
Zacro digital thermometer
A wired probe thermometer with a dry external display. The Amazon extract states ±1 °C accuracy; this has not been independently tested.