UPETTOOLS 300W Aquarium Heater for 151–284 L Tanks, Digital Controller and Error Alerts

UPETTOOLS is a 300W aquarium heater designed to maintain water temperature in 40–75 gallon (151–284 L) freshwater and saltwater aquariums, reef tanks, and fish ponds.

• External digital controller with a temperature display — view water temperature and adjust it at the tank edge.
• E1, E2, and E3 error alerts — identify an out-of-water heater, an open-circuit sensor, or water above 95°F (35°C).
• Thickened explosion-proof quartz glass tube with a nickel-chromium heating element — the heating design is made for quick warming and energy-efficient operation.
• Two suction cups and a mounting bracket — position the heater vertically in fish tanks or horizontally in turtle tanks.
• 12-month manufacturer warranty — includes a year of warranty coverage.

Stable water temperature is important in aquarium and turtle-tank setups, and choosing a heater that suits the tank’s capacity and gives clear temperature information can make routine adjustment more straightforward. UPETTOOLS combines a 300W heater with an external controller and diagnostic display, for use in the tank types and capacity range stated above. The controller sits at the tank edge, so its display and temperature adjustment are accessible without putting your hands in the water.

Which tank sizes and water types does this heater suit?

The UPETTOOLS 300W aquarium heater is made for 40–75 gallon (151–284 L) systems, including freshwater and saltwater aquariums, reef tanks, and fish ponds. Its heater body is 6.9 inches (17.5 cm) long, and its power cord measures 5.34 feet (1.63 m). These measurements help you plan the heater’s position and the cord’s reach in your setup.

• Compare the 6.9-inch (17.5 cm) heater length with the space available inside your tank.
• Allow for the 5.34-foot (1.63 m) power cord when positioning the unit.

How do the digital controller and error alerts work?

The external digital controller displays real-time water temperature in bright red LED digits and lets you adjust the temperature from 68–93°F (20–34°C). A bracket mounts the controller on the tank edge, keeping the display and adjustment button outside the water. Press and hold the button for three seconds to switch between Fahrenheit and Celsius.

The display also uses three error codes to flag specific conditions: E1 means the heater is out of the water and triggers automatic power-off; E2 indicates an open-circuit sensor; and E3 signals water temperature above 95°F (35°C). These alerts give you a clear indication of what the unit has detected.

• E1: out-of-water detection with automatic power-off.
• E2: sensor open-circuit alert.
• E3: water temperature above 95°F (35°C).

How is the heater installed and what is included?

The UPETTOOLS heater includes two suction cups and a mounting bracket for installation on a tank wall. Position it vertically in a fish tank or horizontally in a turtle tank, and do not bury it in substrate. The included external controller attaches at the tank edge with its bracket, while the suction cups secure the heater in place.

The heating assembly uses a thickened explosion-proof quartz glass tube and a high-efficiency nickel-chromium heating element with silicon carbide conduction. This design is intended to warm water quickly and operate efficiently; the heater is also designed to maintain consistent temperature after 72 hours of continuous use. A 12-month manufacturer warranty is included.

• In the box: one aquarium heater, two suction cups, and a mounting bracket.
• Fish-tank position: vertical; turtle-tank position: horizontal.
• Keep the heater out of the substrate rather than burying it.

This heater suits aquarium keepers with a system in its stated capacity range who want an external temperature display, adjustable settings, and on-screen error alerts. It also fits turtle-tank setups when installed horizontally. Its 300W heating unit, tank-edge controller, and included mounting hardware bring temperature adjustment and heater placement into one setup.