Description

Aquael Ultra Heater - 100W Slim Submersible Aquarium Heater

Keep your aquarium stable, healthy and effortless with the Aquael Ultra Heater 100W - a modern, ultra-thin submersible heater engineered for precision. The Ultra series is designed to be space-saving (very flat profile), extremely durable (shatterproof housing) and simple to operate: a one-touch control surrounded by an LED ring lets you set and read the temperature quickly, while a compact shape hides nicely behind décor or inside filter chambers for a tidy aquarium layout.

The 100W Ultra model is sized for small-to-medium tanks (rough guidance ≈16–26 US gallons / 60–100 L) and uses an electronic thermostat that delivers outstanding accuracy to about ±0.25 °C - excellent for sensitive tropical fish, planted aquariums and delicate invertebrates. The heater includes a built-in thermal safety cut-off to prevent overheating and a “smart” heating system that modulates output so temperature swings are minimal. These features make the Ultra Heater useful not only for daily temperature control but also when treating fish (temperature treatments) or carefully replicating natural day/night cycles in the Day & Night variants.

Installation is straightforward: mount the heater vertically (or as instructed) using the included double-sided holder and suction system, fully submerge before powering up, set the desired temperature with the single button, and monitor the LED temperature ring. Because the unit is ultra-flat and built with a durable plastic casing, it’s forgiving in busy hobby settings and is safer to handle than fragile glass tube heaters. For best results pair the Aquael Ultra with a reliable aquarium thermometer and ensure there’s gentle circulation so warmed water spreads evenly.

Why aquarists choose the Ultra 100W: space-efficient design that hides neatly in the tank, excellent thermostat precision for sensitive livestock, simple one-touch operation plus LED feedback, and practical safety features that reduce the chance of overheating. Whether you’re setting up a planted community tank, a tropical display or a quarantine/hospital setup, the Aquael Ultra 100W is a dependable, low-profile heater that helps you maintain a stable aquatic environment with minimal fuss.

Tips & safety: always plug in the heater only after it’s fully submerged, allow several hours for the tank to stabilise after changing settings, never operate a heater out of water, and check operation with a separate thermometer during the first 24 hours. If you need a day/night temperature variation, consider the Ultra Day & Night model which allows safe gradual changes to mimic natural cycles.

Upgrade to the Aquael Ultra 100W for precise, space-saving heating - add to cart now and give your fish and plants the stable temperatures they need to thrive.