At Interzoo 2026, one of the most interesting technical innovations in the aquarium sector came from Teco, the Italian company best known for its aquarium chillers. The new Drop-In line introduces a different approach to aquarium cooling: the refrigeration unit remains outside the aquarium, while the titanium heat exchanger is placed directly in the sump, technical tank or water reservoir.

This is not just a cosmetic update or a minor evolution of a traditional chiller. It changes the way the cooling system is installed and integrated into an aquarium. Instead of pushing water through the chiller with a dedicated pump and hoses, the Drop-In system brings the cooling element directly into the water.

Teco Drop-In: a different way to cool an aquarium

In a traditional aquarium chiller, water is moved from the aquarium or sump to the cooling unit through hoses, usually with a dedicated pump. This is a proven and effective solution, but it also means additional plumbing, more components, more space required, and more possible points of failure.

With the new Teco Drop-In series, the chiller itself remains external, but the titanium coil is immersed directly in the water. The system therefore does not require hydraulic connections, and there is no need to feed water through the chiller body. Heat exchange takes place directly where the water is already present.

The most obvious advantage is installation. The titanium exchanger is placed in the sump or technical tank, the chiller is powered on, and the system is ready to operate. This can be especially useful for existing aquariums, temporary systems, professional holding tanks, emergency setups, or any installation where modifying the plumbing is difficult or undesirable.

The titanium heat exchanger

The heart of the system is the titanium heat exchanger. Titanium is widely used in aquarium chillers because of its resistance to corrosion, especially in saltwater environments. In the Drop-In system, this coil is the component that is placed directly in the water.

There is one important condition: the coil must always remain completely submerged and must be positioned where water movement is adequate. Heat exchange depends not only on the chiller itself, but also on how effectively water moves around the titanium exchanger.

This makes the sump the most natural environment for this type of system. In a well-designed sump, the exchanger can be placed in an area with constant flow, without adding another pump only for the chiller.

A separate temperature probe

Another important detail is the separate temperature probe. This allows the temperature to be measured in the aquarium, or in a well-circulated area of the sump, rather than too close to the heat exchanger itself.

This is a simple but important feature. Measuring temperature in the right place provides a more realistic reading of the whole system, especially in aquariums with complex sumps or different flow zones.

DI 500, DI 1000 and DI 2000

The Drop-In line shown at Interzoo 2026 includes three models: DI 500, DI 1000 and DI 2000. All three use R290 refrigerant gas and share the same general concept: an external refrigeration unit connected to an immersed titanium heat exchanger.

As always with chillers, the nominal aquarium volume should not be read in isolation. Ambient temperature, desired water temperature, thermal load from pumps and lighting, cabinet ventilation, total water volume and target temperature drop all play a major role in real-world performance.

Drop-In versus traditional inline chillers

The Drop-In concept does not necessarily replace traditional inline chillers. It simply offers a different solution for different situations. An inline chiller remains very clean and efficient when the aquarium is designed from the beginning with the chiller integrated into the water circuit.

The Drop-In system, on the other hand, focuses on flexibility. It avoids extra plumbing, reduces the need for hoses, removes the dedicated chiller pump and can be added to existing aquariums more easily. This can be a major advantage in systems that are already running or in installations where hydraulic modifications would be complicated.

The main limitation is obvious: the titanium exchanger must be physically placed in the sump or tank. In reef aquariums with a well-sized sump this should not be a major issue, but in display tanks without a sump the aesthetic impact may be more difficult to accept.

A solution that will probably spark discussion

The Teco Drop-In concept will probably generate different reactions. Some aquarists will immediately appreciate the simplicity: no hoses, no dedicated pump, fewer hydraulic connections and direct heat exchange in the water. Others may question the footprint of the coil, long-term cleaning, ideal positioning in the sump or the visual impact in systems without a technical compartment.

Those are legitimate questions. Any component immersed in saltwater will require maintenance and proper positioning. The coil must remain clean, fully submerged and exposed to good water movement. But these are normal considerations for any technical equipment placed inside an aquarium system.

What makes the Drop-In line interesting is not that it is automatically the best solution for every aquarium. It is that it offers a new option in a product category that has remained relatively stable for many years.

What we think

The new Teco Drop-In series was one of the most interesting technical ideas we saw at Interzoo 2026. It addresses a real problem: how to add or manage aquarium cooling without making the system more complex than necessary.

The immersed titanium heat exchanger is a logical and practical solution, especially for aquariums with a sump, professional systems, temporary tanks or emergency installations. It removes the need for a dedicated pump, reduces plumbing and brings heat exchange directly into the water.

Of course, real-world performance, maintenance, positioning and long-term behavior will need to be evaluated in actual aquarium installations. But the direction is certainly interesting. Teco did not simply present another chiller: it proposed a different way of thinking about aquarium cooling.

For more information on the Drop-In line and the other Teco chillers, visit the official Teco website.