Ultra Heater D&N 200W – aquarium heater

This is a 200 W submersible heater for keepers who run aquariums of 130–200 l and need precise, stable water temperature. It has a day-and-night function for simulating a natural daily temperature cycle, and it is also suited to fish health treatments that call for a higher, controlled temperature.

Why it matters

• Day-and-night cycle: the D&N function lowers temperature at night and raises it during the day, so the tank follows a daily rhythm instead of a fixed setting.
• Precise control: the electronic thermostat holds temperature within ±0.25°C, which matters for sensitive species.
• Simple adjustment: a single ONE-TOUCH button and an LED ring show both the current and the programmed temperature, so the setting can be read and changed without a separate controller.
• Built-in protection: a thermal cut-off guards against overheating, and the heater includes a system that limits water temperature during hot periods.

Specifications

• Power: 200 W
• Recommended tank volume: 130–200 l
• Temperature range: 20–33°C
• Length: 27.4 cm
• Weight: 0.4 kg
• Thermostat precision: ±0.25°C

What it works with

The heater is designed for freshwater and marine aquariums, and the supplier also lists paludariums, aquaterrariums and terrarium pools. Its shatter-resistant housing and the stated safety for sensitive fish such as catfish and stingrays make it suitable for tanks with larger, strong-bodied fish and water turtles. The very flat profile and two-sided hanger allow discreet placement in the tank and easy installation.