ATTACK SLX LAMBDA Touch wood-gasification boiler

30 years of development and production

ATTACK SLX wood boiler

Large chamber. 20 to 55 kW output.

ATTACK SLX is an emission class 5 wood-gasification boiler for logs. It is available in output models from 20 to 55 kW and with a 200 to 230 litre chamber. The LAMBDA Touch version automatically controls the air supply and heat-exchanger cleaning.

Model

SLX20
SLX25
SLX30
SLX35
SLX40
SLX45
SLX50
SLX55

Control system

PROFI
LAMBDA Touch

Emission class

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Category: Wood boilers

20–55 kWoutput models

up to 92%efficiency stated on the product page

200–230 lloading chamber volume

Class 5emission class

Discover the ATTACK SLX boiler

Getting to know the boiler

Choose a topic to learn more about the ATTACK SLX boiler, its installation and everyday operation.

Family homes in a snowy winter landscape

For your home

Suitable for different types of home

A solid-fuel boiler with high output and efficiency can suit different types of home. If you meet the criteria, you may also be eligible for support from the Green for Households programme.

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ATTACK SLX wood boiler with a buffer tank

Installation

Pripojenie kotla

A correct flue connection is essential. When choosing a boiler, consider the building, boiler output, chimney and the full heating system.

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Practical advice for your ATTACK wood boiler

Helpful advice

Practical boiler advice

Learn how to light the boiler quickly and efficiently, why tar forms and how to clean it correctly.

How to light the boiler How to clean the boiler Why tar forms

ATTACK biomass boilers eligible for the grant programme

Household support

Green for Households grant programme

Get a modern appliance for your home with a grant of up to €1,500. Request a quote and we will help with the process, including your grant application.

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ATTACK SLX boiler features

A solution for the most demanding customers

ATTACK SLX brings comfort and output for people who expect more from their heating system. The LAMBDA Touch version automatically controls the air supply and cleans the turbulators; an internet connection also lets you control the boiler remotely. Combustion efficiency of up to 92% helps reduce fuel use and heating costs. The large loading chamber also saves time when preparing wood.

ATTACK SLX technical features

How the ATTACK SLX boiler works

Explore the main chamber, control electronics, flue-gas extraction and automation options.

Logs loaded into the ATTACK SLX boiler chamber

Nakladacia komora

200 to 230 litre chamber

Depending on the model, the chamber holds 200 or 230 litres of logs. The technical table lists maximum log lengths of 650 or 750 mm.

ATTACK SLX LAMBDA Touch touchscreen control panel

Two control options

Control system

PROFI control

The PROFI version allows manual air adjustment.

LAMBDA Touch controls

LAMBDA Touch automatically controls primary and secondary air supply and cleans the heat exchanger.

Ochrana komory

Dry jacket reduces tar buildup

The thermal barrier limits condensation and tar deposits on the loading-chamber walls.

Flue-gas extraction

Faster flue-gas removal when loading

The extraction channel helps clear flue gases from the chamber before the loading door is opened.

ATTACK SLX boiler options

A practical solution for upgrading your boiler room

Technical features presented as practical benefits for design, installation and everyday operation.

Kotol ATTACK SLX s prestavbovou sadou na pelety

Fuel changeover

The fuel choice is yours. ATTACK SLX can be converted into a combination boiler for pellet heating. Changing fuel is simple and makes operation more comfortable and flexible.

ATTACK SLX COMBI PELLET

Buffer tank

For higher output, we recommend adding a buffer tank and ATTACK Oventrop mixing assembly to the boiler.

Buffer tanks

Reversible door opening

ATTACK SLX offers plenty of flexibility in the boiler room. You can choose the door-opening direction to suit the available space.

Flue connection adjustment

Adapt the flue pipe to the layout of the boiler room. A correctly designed connection helps ensure safe and efficient flue-gas removal.

Boiler construction

Explore the ATTACK SLX boiler components

Select a point on the cutaway diagram to learn what each boiler component does.

Cutaway diagram of the ATTACK SLX boiler with labelled components

Komponent 01 / 12

Lambda sonda

It monitors oxygen levels in the flue gases and sends the controller data to manage combustion in the LAMBDA Touch version.

Komponent 02 / 12

Control panel

The boiler is available with PROFI controls, which allow manual air adjustment, or LAMBDA Touch, which automatically controls the air supply and heat-exchanger cleaning.

Komponent 03 / 12

Turbulators

The moving turbulators improve heat transfer in the exchanger; LAMBDA Touch cleans them automatically.

Komponent 04 / 12

Refractory concrete nozzle

The refractory concrete nozzle withstands temperatures up to 1,350 °C and supports reliable operation.

Komponent 05 / 12

Dry jacket

The dry jacket creates a thermal barrier in the loading chamber and helps prevent tar deposits.

Komponent 06 / 12

Dvierka nakladacej komory

Logs are loaded through the upper door. Chamber volume and maximum log length depend on the output model.

Komponent 07 / 12

Turbulator lever

With PROFI controls, the turbulators are cleaned with a manual lever; LAMBDA Touch uses a servomotor.

Komponent 08 / 12

Cleaning opening

The side opening allows ash to be removed from the turbulator area.

Komponent 09 / 12

Combustion chamber door

The lower door lets you remove ash from the combustion chamber and, with PROFI controls, adjust the air supply.

Komponent 10 / 12

Fan

The induced-draught fan creates the airflow needed to maintain boiler output.

Komponent 11 / 12

Cooling loop

It helps cool the heat exchanger if the safety temperature is reached.

Komponent 12 / 12

Flue-gas extraction channel

The extraction channel removes flue gases while fuel is being loaded into the chamber.

Detailed specifications

Technical data

The accompanying Slovak product-page text gives log lengths of 690 and 790 mm, while its technical table and manual list maximum lengths of 650 and 750 mm; the table is retained. The advertised efficiency of up to 92% reflects rounding of the highest table value, 91.8%. Burn time depends on the fuel and how full the chamber is.

Parameter	Unit	SLX20	SLX25	SLX30	SLX35	SLX40	SLX45	SLX50	SLX55
Nominal boiler output	kW	20	25	30	35	40	45	50	55
Output range	kW	10 – 20	12.5 – 25	15 – 30	17.5 – 35	20 – 40	22.5 – 45	25 – 50	27.5 – 55
Heat exchanger surface area	m²	2.95	2.95	2.95	2.95	3.32	3.32	3.32	3.32
Loading chamber volume without dry jackets	dm³	200	200	200	200	230	230	230	230
Rozmer plniaceho otvoru	mm	235 × 445	235 × 445	235 × 445	235 × 445	235 × 445	235 × 445	235 × 445	235 × 445
Required chimney draught	Pa	23	23	23	23	23	23	23	23
Required chimney draught	mbar	0.23	0.23	0.23	0.23	0.23	0.23	0.23	0.23
Maximum water operating pressure	kPa	250	250	250	250	250	250	250	250
Water-side pressure drop (ΔT 10 K)	kPa	1.9	2.1	2.4	2.7	3.9	4.5	5.2	6.1
Water-side pressure drop (ΔT 20 K)	kPa	0.8	0.9	1.2	1.6	1.9	2.1	2.4	3.2
Boiler weight	kg	570	570	570	570	650	650	650	650
Flue outlet diameter	mm	150	150	150	150	150	150	150	150
Boiler height	mm	1472	1472	1472	1472	1472	1472	1472	1472
Boiler width	mm	703	703	703	703	703	703	703	703
Boiler depth	mm	1337	1337	1337	1337	1506	1506	1506	1506
Loading chamber depth	mm	650	650	650	650	750	750	750	750
Flow connection diameter — E	″	G 6/4	G 6/4	G 6/4	G 6/4	G 2	G 2	G 2	G 2
Return connection diameter — F	″	G 6/4	G 6/4	G 6/4	G 6/4	G 2	G 2	G 2	G 2
Ingress protection rating	IP	21	21	21	21	21	21	21	21
Electrical input at nominal output	W	42	42	42	42	78	78	78	78
Electrical input at minimum output	W	31	31	31	31	52	52	52	52
Standby electrical input	W	< 15	< 15	< 15	< 15	< 15	< 15	< 15	< 15
Boiler efficiency	%	91.8	91.6	90.3	90.3	90.4	90.4	90.3	90.3
Boiler class	—	5	5	5	5	5	5	5	5
Flue-gas temperature at nominal output	°C	165	170	175	180	165	170	170	180
Flue-gas temperature at minimum output	°C	130	135	140	145	135	140	140	145
Flue-gas mass flow at nominal output	kg/s	0.018	0.02	0.021	0.023	0.027	0.029	0.031	0.033
Flue-gas mass flow at minimum output	kg/s	0.008	0.011	0.014	0.016	0.017	0.021	0.022	0.023
Maximum noise level	dB	65	65	65	65	65	65	65	65
Fuel class and type	—	Class A logs with 12–20% moisture and a diameter of 50–150 mm	Class A logs with 12–20% moisture and a diameter of 50–150 mm	Class A logs with 12–20% moisture and a diameter of 50–150 mm	Class A logs with 12–20% moisture and a diameter of 50–150 mm	Class A logs with 12–20% moisture and a diameter of 50–150 mm	Class A logs with 12–20% moisture and a diameter of 50–150 mm	Class A logs with 12–20% moisture and a diameter of 50–150 mm	Class A logs with 12–20% moisture and a diameter of 50–150 mm
Average wood consumption	kg/h	5.2	6.5	7.8	9.1	10.4	11.7	13	14.3
Estimated wood consumption per season	—	1 kW = 1 m³	1 kW = 1 m³	1 kW = 1 m³	1 kW = 1 m³	1 kW = 1 m³	1 kW = 1 m³	1 kW = 1 m³	1 kW = 1 m³
Maximum log length	mm	650	650	650	650	750	750	750	750
Burn time at nominal output	h	8	7.2	6.5	5.8	6	5.1	4.6	4
Objem vody v kotle	l	117	117	117	117	136	136	136	136
Supply voltage	V/Hz	~230/50	~230/50	~230/50	~230/50	~230/50	~230/50	~230/50	~230/50
Rozsah nastavenia teploty vykurovacej vody	°C	65 ÷ 85	65 ÷ 85	65 ÷ 85	65 ÷ 85	65 ÷ 85	65 ÷ 85	65 ÷ 85	65 ÷ 85
PROFI controller contact rating	—	2 A/ ~230 V	2 A/ ~230 V	2 A/ ~230 V	2 A/ ~230 V	2 A/ ~230 V	2 A/ ~230 V	2 A/ ~230 V	2 A/ ~230 V
Minimum buffer tank volume	l	500	600	700	800	1000	1100	1200	1300
Recommended buffer tank volume	l	1000	1400	1600	2000	2200	2500	2800	3000