Condensing and atmospheric boilers

Gas boilers

ATTACK gas boilers for heating and domestic hot water in family homes, apartments and smaller commercial premises.

30+ years of development and production

Product ranges

Model overview

Each model has its own applications, output range and design. Below is an overview of the main differences; full specifications and documents are available on each product page.

ATTACK Condensing KT gas condensing boiler

Gas condensing boiler

ATTACK Condensing KT 20/28

Wall-mounted boiler that can be connected to an external DHW tank.

The boiler provides heating and, with a flexible hot water tank connection, can meet the needs of a larger household. Its modulation of up to 1:10 and intelligent ISC combustion system help reduce gas consumption. The boiler can also be controlled according to the outdoor temperature using weather-compensated control.

modulation range
1:10
combustion control
ISC
stated efficiency
up to 106%
  • Cascade connection option
  • OpenTherm control
  • SMART control
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ATTACK Atmospheric NSK 24 non-condensing gas boiler

Non-condensing gas boiler

ATTACK Atmospheric NSK 24

Non-condensing boiler with on-demand domestic hot water heating.

This atmospheric boiler has a rated output of 24 kW and heats domestic hot water instantaneously. It can connect to an existing chimney designed for non-condensing boilers.

Output
8.8–24 kW
Efficiency at rated output
90.11%
Emissions class
NOx 6
  • OpenTherm control
  • SMART control
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ATTACK Condensing KST 24 condensing gas boiler

Gas condensing boiler

ATTACK Condensing KST 24

Heating and on-demand domestic hot water in one boiler.

ATTACK Condensing KST 24 combines efficient heating with convenient on-demand domestic hot water preparation. Its 1:10 modulation and intelligent ISC system adapt output to the home’s current needs and help reduce gas consumption. The boiler operates across a 3–30 kW range and can also be controlled according to the outdoor temperature using weather-compensated control. A practical choice for smaller homes and apartments.

modulation range
1:10
combustion control
ISC
stated efficiency
up to 106%
  • Cascade connection option
  • OpenTherm control
  • SMART control
Learn more about this product
ATTACK Condensing KZT 25 gas condensing boiler

Gas condensing boiler

ATTACK Condensing KZT 25

Condensing boiler with an integrated 60-litre tank.

The boiler combines efficient heating with convenient hot water preparation. Its integrated 60-litre domestic hot water (DHW) tank and intelligent ISC system provide comfort and efficient operation. Modulation of up to 1:10 adapts output to current demand and helps reduce gas consumption. A practical solution for homes with higher DHW demand.

modulation range
1:10
Smart control
stated efficiency
up to 106%
  • Cascade connection option
  • OpenTherm control
  • SMART control
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ATTACK COMBI floor-standing gas boiler

Floor-standing gas boiler

ATTACK COMBI

Cast-iron boilers in five control versions

ATTACK COMBI is a floor-standing gas boiler with a cast-iron body. It is available in five output options from 12 to 30 kW and five versions: EKO, PLQ, KLQ, E and EZ. Depending on the version, it offers fixed, two-stage or continuous output control.

Output
12–30 kW
versions
5
High efficiency
93 %
  • Proven cast-iron heat-exchanger design
  • Wide choice of domestic hot water tanks
  • High output modulation up to 1:10
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ATTACK Condensing KT 48 gas condensing boiler

Gas condensing boiler

ATTACK Condensing KT 48

Wall-mounted condensing boiler for larger buildings.

Condensing boiler with an output of up to 49.2 kW and the option to connect an external domestic hot water tank. The manufacturer lists larger buildings and apartment blocks as suitable uses.

maximum output
49.2 kW
modulation range
1:10
stated efficiency
109.2%
  • Cascade connection option
  • OpenTherm control
  • SMART control
Learn more about this product

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