Three basic types of heaters exist: clipon, submersible, and electronic. Clip-on heaters represent an economical option for providing stable temperatures and are designed to be fastened to the aquarium frame. It is important to respect the indicated water line. This will ensure proper functioning of the thermostat.

Submersible heaters offer greater flexibility in terms of application (aquariums with lower water levels) and are available in easy-to-hide smaller diameters, such as the Hagen Thermal Compact and Pre-Set range.


The Hagen Tronic electronic heater employs a technologically advanced method of temperature control and eliminates mechanical technologies found in conventional heaters.

Tronic Electronic Aquarium Heaters provide consistent, fast heat technology.

Tronic Heater Guard protects fish from burns and lesions and guards against heater breakage

	Model Style Watts  25   50   75  100 150 200 300 Radiant Compact Radiant  Clip-on  Clip-on ¤ ¤ ¤ ¤ ¤ ¤ ¤     Thermal Compact Mini Thermal Compact Thermal Compact Pre-Set Subm. Subm. Subm. ¤ ¤   ¤ ¤   ¤   ¤ ¤ ¤ ¤ ¤ ¤ Tronic Subm. ¤   ¤ ¤ ¤     Aquarium Capacity* Gallons liters 5½ 20 10 37 15 56 10-25 37-94 25-40 94-151 40-60 151-227 60-90 227-340
	*Recommended capacity - Normal Room temperature Note: Many external operating conditions such as (a) Room Temperature Variance, (b) Lack of Aquarium Cover, (c) Presence of Submersible Pumps and Filters, (d) Aquarium placement in cooler environments, may call for a more powerful heater. Multiple heaters are suggested for larger aquariums.