1:10
Power modulation
ISC
Combustion system
106 %
High efficiency
H2
Ready
ATTACK Condensing KST 24 is a wall-mounted gas condensing boiler suitable for heating with flow-through DHW preparation. The boiler achieves significant gas consumption savings thanks to continuous power modulation up to 1:10, and the Intelligent Combustion System ISC can operate even with a minimum power from 3-30 kW, which is a great advantage for family houses. The boiler can also be controlled according to the outdoor temperature (weather-compensated regulation).
Suitable for every type of house, apartment, or business
ATTACK Condensing KST 24 offers heating and DHW (domestic hot water) heating by a flow-through method, which means that heating takes place in real-time as water flows through the boiler heat exchanger, which heats the water and it is immediately available. Therefore, the use of this model is mainly for smaller houses or apartment units.
Gas boiler connection
To use a gas condensing boiler, it is necessary to have a natural gas connection, which belongs among the most ecological fuels among fossil fuels. For those who would like to have a condensing boiler even without a natural gas connection, there is a solution. The boiler can be connected to propane.
ATTACK Condensing KST 24 can be used for several types of gas (G20 natural gas or G31 propane; changing and setting the fuel must be performed by an service technician.
Why choose a gas boiler
Low acquisition cost of the device compared to biomass boilers or heat pumps – it belongs among the cheapest and least maintenance-demanding sources.
High power modulation
ATTACK Condensing KST 24 has a high range of power modulation up to 1:10. This is the main technical advantage of our gas boilers. This modulation system consists in the fact that the boiler can operate at low power, for example (starting from 2.4 kW). It achieves a high efficiency of up to 106% with energy class A for heating.
The intelligent combustion system controls combustion and adjusts values such as gas flow to always achieve the correct air/gas ratio.
- Reduction of gas consumption
- Lower CO2 emissions
- Shorter time for installation and boiler setting
- Modulation range 1:10
- Reduction of the number of off/on cycles
- Extension of boiler service life
Quality and efficiency
Gas boilers are small wall-mounted devices suitable for heating households or more spacious objects.
The new brass hydraulic group is equipped with:
- High-efficiency pump
- Three-way valve
- By-pass
- Flow regulator with filter
- Drain valve
- DHW temperature sensor
Technical information about important parts of the boiler that might interest you.
Air supply
It serves to supply the air necessary for combustion.
Flue gas discharge
It is used to remove flue gases from the boiler combustion chamber.
Condensation exchanger
It transfers heat from the flue gases to the heating water.
Gas valve
Regulates the gas supply for combustion
Siphon
Serves as an odor trap, preventing odors from the combustion chamber from penetrating into the external waste
Modulating pump
Ensures circulation of heating water in the hot water system
Three-way valve
Ensures the direction of flow of heating water into the heating system or into the indirectly heated DHW exchanger
Mixer
It serves to create a gas mixture for combustion
Burner
A mixture of gases burns on its surface, releasing heat.
Fan
It serves to supply the gas mixture to the gas burner.
Safety valve
It is a safety element that serves to reduce pressure in the heating system in the event of overpressure.
Plate exchanger
Provides instantaneous heating of DHW through heating water
Technical data and documents for download
The ATTACK Condensing KST 24 gas condensing boiler achieves a high combustion efficiency of up to 106% with a power modulation of 1:10. The ISC intelligent combustion system with high-quality components and processing guarantees a long service life. Find out more about other technical data.
- High power modulation 1:10
- ISC intelligent combustion system
- H2 ready
- High combustion efficiency 106%
- Flow-through hot water heating
- Wide power range 3-30 kW
- Stainless steel exchanger
- Frost and bacteria protection
- Brass hydraulic group of components
| Parameter | Einheit | ATTACK Condensing KST 24 |
| Die maximale Wärmezufuhr der Zentralheizung | kW | 30 |
| Minimaler Wärmeeintrag von CU | kW | 3 |
| Maximale Wärmeleistung der Heizeinheit (50/30 °C) / (80/60 °C) |
kW | 25,2/23,3 |
| Mindestwärmeleistung des Heizsystems (80/60 °C) | kW | 2,8 |
| G20 Versorgungsgasdruck | mbar | 20 |
| G31 Versorgungsgasdruck | mbar | 37 |
| NOx-Emissionsklasse | – | 6 |
| Max Min. Betriebsdruck beim Aufheizen | bar | 3/1 |
| TEffizienzklasse nach Richtlinie 92/42 EWG | – | A |
| WW-Durchfluss Δt 25 °C | l/min | 17 |
| WW-Durchfluss Δt 30 °C | l/min | 13 |
| Stärke des Schutzes | IP | IP X5D |
| Elektrische Spannung | V/Hz | 240/50 |
| Elektrischer Eingang | W | 85 |
| Gewicht des leeren Kessels | kg | 30,2 |
| Abmessungen (B×H×T) | mm | 400×727×324 |
High-quality processing
All our products are manufactured with an emphasis on the selection of quality materials and the use of correct technologies and procedures. Brass components of the hydraulic assembly ensure maximum product reliability. Our own know-how is a guarantee of reliable service and long life.
Possibility of cascade connection
Condensing boilers are designed to allow cascade connection of up to 4 boilers. For cascade connection, it is necessary to use a cascade controller, which can be purchased as an accessory. The cascade controller intelligently manages connected boilers and provides perfect control over the connected system.
Comfort with OpenTherm regulation
It is also possible to increase the comfort of a gas boiler using a regulator that will adjust the temperature according to the outdoor temperature. The temperature will thus automatically adapt to changes in the household and the outdoor temperature. This method of regulation can more effectively utilize the boiler’s power and at the same time save you money on operation.
In addition, you get greater comfort because the regulator takes care of everything for you. If, however, you want even more convenience, it will be provided by an additional control with OpenTherm two-way communication.
* the weather-compensated regulator is not part of the boiler delivery.
OpenTherm regulation (optional accessory)
The boiler allows connecting OpenTherm regulation, which can not only turn on the boiler but also detect the difference between actual room temperature and the set value, allowing boiler power modulation according to the thermal needs of the system. OpenTherm regulation guarantees lower consumption, more stable temperature, and greater comfort for the user. Get maximum comfort.
Smart remote control
ATTACK Condensing offers optional accessory OpenTherm room thermostat OT80 and Wifi modem OT81, with which you can control your boiler remotely via the ATTACK Condens mobile application.
Choose a service partner for installation
Creating a high-quality and prompt service network for our customers is very important to us. Our service partners provide prompt service assistance to every customer throughout the year.
