Aquarium Heater Diversa Thermoplus 25W — Submersible Heater for Small Tanks

Diversa Thermoplus 25W is a compact submersible aquarium heater designed to keep water temperature stable in small tanks. The unit provides gentle, continuous heating at 25 watts, suitable for maintaining tropical conditions in nano-aquaria, shrimp tanks, or fry rearing setups. The heater's size and submersible construction allow discreet placement inside the aquarium, enabling everyday use to reduce temperature fluctuations and support aquatic life.

Advantages

The Diversa Thermoplus 25W delivers steady heat output with low power consumption, reducing temperature swings that can stress fish and invertebrates. Its compact, fully submersible design fits easily in small tanks and aquascapes. The heater is built for continuous operation and provides reliable, even warming across the aquarium volume, helping to maintain a consistent environment for sensitive species.

Suitable for

• Small tropical freshwater aquaria and nano tanks
• Shrimp and invertebrate setups requiring gentle heating
• Fry rearing and breeding tanks with stable temperature needs
• Desktop aquariums and planted nano systems

Key specifications

• Power: 25 W
• Mounting: fully submersible design for in-tank placement
• Suitable tank size: small aquaria and nano tanks (model optimized for low-volume systems)
• Operation: continuous, for everyday use to maintain stable temperature
• Material: corrosion-resistant housing appropriate for freshwater environments

How to use

Install the heater fully submerged in the aquarium, placing it where water circulation is steady but not directly in front of high-flow outlets. Position the heater vertically or horizontally according to available space and secure it with the included suction mounts if provided. Allow the heater to acclimate and run continuously; verify water temperature with an external thermometer placed away from the heater to ensure accurate readings. When adjusting temperature, change settings gradually and monitor fish behaviour and water parameters during the first 24–48 hours.

Usage recommendations

Use the Diversa Thermoplus 25W in aquaria with appropriate volume for a 25 W heater. Combine with an accurate external thermometer and, where required, a thermostat controller for precise temperature regulation. Regularly inspect the heater and its seals for wear, and follow standard aquarium maintenance practices such as partial water changes and stable lighting cycles to support a healthy aquatic environment.