Product Price Wattage (W) Temperature Range (°C) Heating Element Material Dimensions (cm) Submersible or Hang-On Adjustable Temperature Control
Eheim JAGER TruTemp 200W (model 3617)
US
£29.09 200 laboratory glass jacket 15.7 in x null x null

Fully submersible 200W TruTemp heater with a shatter-proof laboratory glass jacket, onboard adjustable thermostat and dry-run protection. Suited for freshwater and saltwater aquaria roughly 79-106 gallons and users who want a calibratable, accurate glass-sleeved heater.

Eheim JAGER TruTemp 300W (model 3619)
US
£29.09 300 W 18-34 Laboratory glass jacket (glass) 20 in x null x null

The Eheim JAGER TruTemp 300W is a fully submersible aquarium heater with a shatter‑resistant laboratory glass jacket, TruTemp recalibration for precise control, and dry‑run safety shutoff. It suits large freshwater or saltwater aquariums (approx. 159-264 gallons) needing reliable, stable temperature control.

JBL ProTemp S 300
US
£20.60 300 20-34 ceramic 375 mm x 29 mm x 29 mm

The JBL ProTemp S 300 is a 300 W submersible aquarium heater with a protective basket, dry-run protection, and direct °C temperature selection. It uses a ceramic star-shaped heating element and suits freshwater and marine tanks around 160-400 L where reliable, protected heating is required.

Finnex STE-400 Titanium Heater with Controller
US
£60.29 400 Titanium

The STE-400 is a 400 W titanium-tube aquarium heater with an external waterproof digital controller that provides precise, durable temperature control for freshwater and saltwater tanks. It suits hobbyists and reef keepers who need a corrosion-resistant, long-lasting heater for medium-to-large aquaria.

Aqua Medic Titanium Heater 300W
US
£31.67 300 W -10 °C - +45 °C Titanium 300 mm x 20 mm x null

Slim, unbreakable titanium heating element for fresh and saltwater aquaria with overheat and dry-run protection; intended for use with an external temperature controller. Suits large aquaria up to 500-1,000 litres and users who need durable, corrosion-resistant heating.

Helio (Innovative Marine) Helio Titanium Inline Heater
US
£143.38 200 Titanium

Helio uses PTC solid-state ceramic technology with titanium heating elements and a dedicated controller and remote probe for stable, safe aquarium heating. It suits reef and freshwater hobbyists who want redundant safety features and precise temperature control via an external controller.