Reglerheizer 25W – thermostat-controlled heater for aquariums

This 25 W heater suits keepers of small tropical aquariums who need to hold a stable water temperature without a separate controller. It is intended for tanks from 10 to 45 litres, where the thermostat switches the heating element on when the water cools below the set point and off once the target is reached.

Why it matters

• Thermostat control: the adjustable thermostat keeps the set temperature by cycling the heater as the water drops, within a working range of 12 °C to 34 °C.
• Easy adjustment: the temperature dial sits on the upper part of the unit, so the set point can be changed without lifting the heater out of the water.
• Full submersion: the IPX8 waterproof rating allows continuous operation fully underwater.
• Compact body and mounting: the unit measures 21.5 cm × 3 cm including the dial, and the included large suction cups let it be fixed vertically or horizontally, making it easy to conceal among decorations.

Specifications

• Power: 25 W
• Working temperature range: 12 °C to 34 °C
• Suitable tank volume: 10 l to 45 l
• Minimum water level: 15 cm
• Overall dimensions (including dial): 21.5 cm × 3 cm
• Waterproof rating: IPX8
• Suitable for freshwater and marine aquariums
• Brand: Kruger Meier
• Weight: 0.18 kg

What it works with

The heater is matched to freshwater and marine aquariums in the 10 to 45 litre range, with a minimum water depth of 15 cm required for safe operation. Larger tanks need a higher-wattage model from the same brand's range, which is sold as separate listings.