Double-Coil Water Heater

High-Efficiency Heating and Superior Hygiene Technology

FENNEX Double-Coil Water Heaters offer a highly efficient, economical, and reliable hot water solution by optimizing energy from two different heat sources within a single unit. Thanks to the dual-coil design, these boilers enable the combined use of different heat sources—such as solar energy, heat pumps, boilers, or combi boilers—helping to meet hot water needs continuously and efficiently.

FENNEX engineering has been developed to deliver high heat transfer performance, ease of maintenance, energy efficiency, and hygienic operation all in one.

Why Choose FENNEX Dual Coil Technology?

Hybrid Energy Integration

Thanks to the dual-coil design, solar collectors can be used alongside different heat sources—such as heat pumps, boilers, or combi boilers—within the same system. Utilizing two different energy sources together helps make more efficient use of available energy resources and reduces operating costs.

Special Replaceable Coil Design

In FENNEX Dual-Coil Boilers, the coils feature a special design mounted at the bottom of the tank. Thanks to the coils’ replaceable design, in cases of scaling or when maintenance is required, the coil can be easily removed and replaced as a single unit without needing to replace the entire boiler.

This design simplifies maintenance and service procedures while helping to extend the product’s service life and reduce long-term maintenance costs.

Homogeneous Heat Distribution and Hygiene

The strategic positioning of the coils helps heat the domestic hot water inside the tank starting from the very bottom. This minimizes the formation of cold spots and areas where water may remain stagnant for extended periods.

Homogeneous heat distribution helps create a more hygienic and reliable hot water system by reducing the risk of bacterial growth, particularly from bacteria such as Legionella.

Technical Advantages and User Benefits

Feature​	Benefits It Offers
Double Heat Exchanger	By enabling the combined use of renewable and traditional energy sources, it contributes to high efficiency and energy savings
Replaceable Coil System	It offers easy maintenance and service; it ensures low maintenance costs and a longer product lifespan
FENNEX Plus Defender Coating	It enhances durability by providing high resistance to corrosion and helps ensure that potable water is kept hygienic.
High-Density Insulation	It helps keep the water hot for longer by minimizing heat loss.

Applications

FENNEX Dual-Coil Water Heaters can be reliably chosen for applications with high-volume, uninterrupted hot water needs, such as hotels, hospitals, apartment complexes, commercial buildings, and industrial facilities.

Thanks to their ability to utilize dual heat sources, highly efficient heat transfer, and interchangeable coil technology, they offer a flexible and long-lasting solution for a variety of hot water needs.

FENNEX

“We don't just heat water; we're shaping the future of energy with confidence and efficiency.”