30 years of development and manufacturing

ATTACK COMBI gas boiler

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 kW
15 kW
20 kW
25 kW
30 kW

Domestic hot water preparation

External tank

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Category: Gas boilers

12–30 kWOutput

5versions

93 %High efficiency

Cast-ironbody

Discover ATTACK COMBI floor-standing gas boilers

Choose the output and control method

An overview of the ATTACK COMBI floor-standing boiler range and its main versions.

A family home in winter, suitable for heating with an ATTACK gas boiler

Suitable for homes and apartments

Suitable for every type of home or apartment

ATTACK COMBI is available in five versions (EKO, PLQ, KLQ, E and EZ) and outputs from 12 to 30 kW. Choose a domestic hot water tank with a capacity of 40–275 litres. It can heat a house, apartment or commercial building.

More about gas boilers

Copper pipe connections on the ATTACK COMBI floor-standing gas boiler

Gas

Boiler connection

The boiler operates quietly and can be connected to a chimney for flue-gas discharge. Its design focuses on straightforward controls, easy maintenance and long service life with reliable performance.

Floor-standing gas boiler

Choose a version to suit the control method

The floor-standing boiler is fully automatic. It is controlled by the boiler control system or a room controller, with the option to connect a higher-level control system.

ATTACK COMBI technical features

Differences between versions

Ignition, flame sensing and output control vary by version.

Boiler version
Feature	EKO	PLQ	KLQ	E	EZ
Ignition	Pilot light	Pilot light	Electronic	Electronic	Electronic
Flame sensing	Thermocouple	Thermocouple	Ionisation electrode	Ionisation electrode	Ionisation electrode
Output control	X	Manual two-stage (80%, 100%)	Manual two-stage (80%, 100%)	Automatic two-stage step control (80%, 100%)	Automatic two-stage modulating control (80%, 100%)
Domestic hot water heating control	X	X	X	X
Fault diagnostics	X	X	X	X

Comparing the main versions

Compare ignition, flame sensing, output control and other features across the boiler versions.

Control panel on the ATTACK COMBI EKO version

EKO

Fixed output

The EKO version uses pilot-light ignition and thermocouple flame sensing. It operates at a fixed output.

Control panel on the ATTACK COMBI floor-standing boiler

Automatic two-stage control

The E COMBI boiler adjusts its output automatically, in the same way, 7 °C before it reaches the target temperature, so no manual adjustment is needed.

Control panel on the ATTACK COMBI PLQ and KLQ versions

PLQ

Manual two-stage control

The more advanced PLQ and KLQ COMBI versions offer simple two-stage control. A switch reduces full output to 80% while maintaining the same efficiency.

KLQ

Manual two-stage control

The more advanced PLQ and KLQ COMBI versions offer simple two-stage control. A switch reduces full output to 80% while maintaining the same efficiency.

Electronic control panel on the ATTACK COMBI EZ version

Automatic continuous control

For more advanced control, the EZ COMBI boiler automatically adjusts output continuously from 80% to 100%. It offers the widest range of control options among the floor-standing versions.

ATTACK COMBI gas boiler options

A wide choice of domestic hot water tanks

Choose a tank with the capacity and features you need for domestic hot water preparation.

Floor-standing ATTACK COMBI gas boiler connected to a domestic hot water tank

Domestic hot water tank connection

For our floor-standing gas boilers, we offer a wide choice of indirectly heated tanks for domestic hot water. Choose from models with different features, one or two heat exchangers, installation options and capacities from 40 to 275 litres.

Detailed specifications

Technical data

Technical values are transcribed from the current ATTACK product page and the 2026 ATTACK catalogue, page 33. Some values in the catalogue table apply to more than one output; models 12–20 have 3 sections and models 25–30 have 4. The page states 93% efficiency in its marketing copy and 92–93% in the technical table.

Parameter	Unit	12	15	20	25	30
Rated output of EKO and KLV	kW	12	15	20	25	30
Rated heat input of EKO and KLV	kW	13.4	16.5	19.5	27	32.5
Number of sections	pcs	3	3	3	4	4
Controllable output of PLQ and KLQ	kW	—	12–15	14.5–18	20–25	24–30
Modulating output of E and EZ	kW	—	12–15	14.5–18	20–25	24–30
Controllable heat input of PLQ and KLQ	kW	—	13.5–16.5	15.6–19.5	21.6–27	26.4–32.5
Modulating heat input of E and EZ	kW	—	13.5–16.5	15.6–19.5	21.6–27	26.4–32.5
Nozzle diameter	mm	2.5	2.5	2.5	2.5	2.7
Nozzle pressure for EKO, PLQ and KLQ	kPa	0.8	0.8–1.05	1.05–1.45	0.8–1.2	0.9–1.25
Nozzle pressure for E and EZ	kPa	—	0.8–1.05	1.05–1.45	0.8–1.2	0.9–1.25
Gas consumption at maximum output	m³/h	1.3	1.6	2.05	2.65	3.15
Gas consumption at minimum output	m³/h	—	1.25	1.65	2.1	2.5
NOx class	—	5	5	5	5	5
Fuel	—	Natural gas G 20	Natural gas G 20	Natural gas G 20	Natural gas G 20	Natural gas G 20
Natural gas connection	DN	15 (union nut 3/4")	15 (union nut 3/4")	15 (union nut 3/4")	15 (union nut 3/4")	15 (union nut 3/4")
Flue-gas outlet diameter	mm	110	110	110	135	135
Water capacity of cast-iron body	l	10	10	10	13.8	13.8
Maximum pressure in heating circuit	kPa	300	300	300	300	300
Heating-circuit connection	G	3/4"	3/4"	3/4"	3/4"	3/4"
Boiler weight	kg	99	99	99	125	125
Electrical supply	V/Hz	~230/50	~230/50	~230/50	~230/50	~230/50
Ingress protection rating	IP	40	40	40	40	40
Heating-water temperature	°C	40–90	40–90	40–90	40–90	40–90
Efficiency	%	92–93	92–93	92–93	92–93	92–93
Flue-gas mass flow	g/s	—	14.4	—	20.5	—
Electrical input	W	15–30	15–30	15–30	15–30	15–30