When designing heating systems, efficiency, reliability and the ability to precisely match the device to the requirements of the building are of key importance. The CRYSTAL III condensing boiler from Termet S.A. was developed to meet these criteria both in single-family homes and in multi-family buildings or public facilities. The unit offers both single-function versions - working with a hot water cylinder - and dual-functionversions with a built-in exchanger for instantaneous hot water preparation. Available power variants (from 20 to 40 kW, depending on the version) allow precise selection of the device according to the heat demand, and the possibility of combining up to four boilers in a cascade system increases the flexibility and power of the entire installation in larger facilities.
Crystal III - gas condensing boiler
© Termet
Technology for efficiency and durability
CRYSTAL III uses a stainless steel heat exchanger with a single coil, which reduces the risk of scale build-up and extends the life of the unit. An advanced flame modulation system and soft ignition function allow the boiler to automatically adjust its output to the current heat demand, ensuring energy savings and stable operation throughout the power range.
System control and comfort of use
The boiler is equipped with a control panel with LCD display for full self-diagnosis and intuitive operation. Cooperation with Termet ST-2801 or CR11011 controllers allows remote management of the appliance via the Internet, while Open-Therm communication makes it possible to control the heating from a room controller, either wired or wireless. Integration with an outdoor temperature sensor allows weather control, which translates into optimal thermal comfort with minimal gas consumption.
Crystal III gas condensing boiler
© Termet
Use in cascade systems
Cascade systems consisting of several CRYSTAL III boilers allow you to adjust the power to the changing demand of the building. This solution works especially well in multi-family buildings, schools or office buildings, where the heat load varies throughout the day and heating season. The cascade connection of boilers allows optimal use of energy while maintaining the reliability of the entire system.
Energy efficiency
and compatibility with renewable sources
CRYSTAL III belongs to Class 6 in terms of nitrogen oxide emissions, and the efficiency of the boiler at part load reaches 108%, which corresponds to energy efficiency class A. The use of a controller with Open-Therm communication can raise the efficiency to Class A+. The boiler is also suitable for integration with hybrid systems, including heat pumps and solar collectors, which increases its applicability in modern and sustainable construction.
Crystal III gas condensing boiler
© Termet
Convenience for installer and service
The design of the boiler takes into account easy access to key components, such as the side-mounted expansion vessel. This facilitates installation, adjustment and servicing, resulting in shorter commissioning times and less risk of installation errors. Additional technical support from the manufacturer ensures trouble-free commissioning and maintenance of the system.
CRYSTAL III boiler is a device combining high energy efficiency, durability and application flexibility. The ability to work in cascade systems, control via the Internet and integrate with renewable energy sources makes the boiler applicable both in new investments and in modernized heating installations, providing comfort of use with optimal fuel consumption and minimal impact on the environment.



