ATTACK DPX COMBI PELLET wood and pellet boiler

30 years of development and production

ATTACK DPX COMBI PELLET wood and pellet boiler

Logs or automatic pellet firing.

The ATTACK DPX COMBI PELLET combines a log boiler with an automatic pellet burner. When firing wood, a blanking plate closes the burner opening; in pellet mode, the burner automatically feeds, ignites and burns the fuel.

Output

25 kW
30 kW
35 kW
40 kW
45 kW
50 kW

Control system

PROFI

Emission class

Fuel

Logs
Wood pellets

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Category: Combination boilers

25–50 kWoutput range

up to 91%efficiency stated on the product page

Easyfuel changeover

Automaticburner operation

Discover the ATTACK DPX COMBI PELLET boiler

Getting to know the boiler

Choose a topic to learn more about the ATTACK DPX COMBI PELLET 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 DPX wood boiler connected to a chimney

Installation

Connecting the boiler

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 DPX COMBI PELLET boiler features

Two ways to heat your home

The boiler combines the DPX PROFI wood-gasification design with a pellet burner. When burning logs, a blanking plate covers the burner opening; in pellet mode, the burner automatically feeds and ignites the fuel and controls combustion.

ATTACK DPX COMBI PELLET boiler and buffer tank in a boiler room

ATTACK DPX COMBI PELLET technical features

How the DPX COMBI PELLET works

Explore the main boiler components and compare log-fired and automatic pellet operation.

Logs in the loading chamber and pellets for the ATTACK DPX COMBI PELLET boiler

Fuel changeover

Logs or automatic pellet firing

When burning logs, a blanking plate closes the burner opening. In pellet mode, the burner handles fuel feeding and ignition.

Burning logs in a wood boiler loading chamber

Loading logs

125 to 190 litre loading chamber

The models accept logs from 550 to 750 mm long. The exact size depends on the output model.

Cutaway view of the ATTACK pellet burner during operation

Pellet combustion

The burner automatically ignites and controls combustion

In pellet mode, the automatic burner feeds the fuel, ignites it electrically and controls combustion.

ATTACK pellet burner with its ash tray extended and emptied

Burner maintenance

The burner cleans itself after combustion

After combustion, an automatic cycle removes ash into the container.

Controls

PROFI control

Designed for everyday heating, the PID controller continuously adjusts fan speed, controls two pumps and supports systems with a buffer tank.

ATTACK DPX COMBI PELLET boiler options

A practical solution for upgrading your boiler room

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

Pellet burner

ATTACK Pellet Burner Automatic

Convenient heating with minimal attention: the burner automatically feeds and electrically ignites the pellets. Set the output from 8 to 30 kW in 2 kW increments; add a room thermostat for even more convenient control.

Buffer tank

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

Pellet hopper

A 500 l pellet hopper is also available for the boiler. An external fabric pellet hopper, or big bag, can also be used. The large hopper keeps the boiler burning for longer between refills.

Flue pipe connected to an ATTACK DPX boiler

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 DPX COMBI PELLET boiler components

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

Cutaway diagram of the ATTACK DPX COMBI PELLET boiler with its automatic burner and blanking plate

Komponent 01 / 13

Control panel

The boiler uses the PROFI control unit. It displays operating information; the air supply and heat-exchanger cleaning are adjusted manually.

Komponent 02 / 13

Turbulators

Turbulators in the tube heat exchanger improve heat transfer to the heating water and help keep the exchanger clean.

Komponent 03 / 13

Refractory concrete insert

The refractory concrete insert in the combustion chamber withstands high temperatures and helps extend the boiler’s service life.

Komponent 04 / 13

Loading chamber door

Logs are loaded into the large chamber through the upper door.

Komponent 05 / 13

Turbulator lever

The cleaning lever moves the turbulators and loosens deposits inside the tube heat exchanger.

Komponent 06 / 13

Cleaning opening

The side opening lets you remove ash and debris from inside the boiler.

Komponent 07 / 13

Fan

The fan supplies the air needed to maintain boiler output.

Komponent 08 / 13

Cooling loop

The cooling loop helps cool the heat exchanger if the safety temperature is reached.

Komponent 09 / 13

Automatic flue damper

When the loading door opens, the damper directs flue gases from the chamber straight into the chimney.

Komponent 10 / 13

Combustion chamber door

The lower door is used mainly for ash removal; with PROFI control, it also allows manual adjustment of the air supply.

Komponent 11 / 13

Blanking plate

The plate closes the burner opening when the boiler is used to burn logs.

Komponent 12 / 13

Automatic pellet burner

The Pellet Burner Automatic feeds pellets onto the grate, ignites them electrically and controls combustion.

Komponent 13 / 13

Sliding burner bracket

The bracket supports the burner and lets it slide out when switching to log-fired operation.

Detailed specifications

Technical data

Check the manufacturer's current documentation before designing the heating system.

Parameter	Unit	DPX 25 CP	DPX 30 CP	DPX 35 CP	DPX 40 CP	DPX 45 CP	DPX 50 CP
Nominal output — wood	kW	25	30	35	40	45	50
Nominal output — pellets	kW	30	30	30	40	45	49.9
Output range — wood	kW	12–25	15–30	17–35	20–40	22–45	22–45
Output range — pellets	kW	8–30	8–30	8–30	15–45	15–45	15–49.9
Heat exchanger surface area	m²	2.52	2.78	2.78	3.03	3.03	3.03
Loading chamber volume	dm³	125	158	158	190	190	190
Loading opening dimensions	mm	235 × 445	235 × 445	235 × 445	235 × 445	235 × 445	235 × 445
Required chimney draught	Pa	23	23	23	23	23	23
Maximum water operating pressure	kPa	250	250	250	250	250	250
Water-side pressure drop (ΔT 10 K)	kPa	2.3	4.4	4.4	6.6	6.6	6.6
Water-side pressure drop (ΔT 20 K)	kPa	0.7	1	1	1.8	1.8	1.8
Boiler weight	kg	480	510	510	540	540	540
Flue outlet diameter	mm	150	150	150	150	150	150
Boiler height — A	mm	1 240	1 240	1 240	1 240	1 240	1 240
Boiler width — B	mm	760	760	760	760	760	760
Boiler depth — C	mm	1 250	1 350	1 350	1 425	1 425	1 425
Boiler depth — C with burner	mm	1 510	1 610	1 610	1 765	1 765	1 765
Chamber depth — D	mm	590	690	690	790	790	790
Ingress protection rating	IP	21	21	21	21	21	21
Electrical input — wood	W	38	102	102	102	102	102
Electrical input — pellets	W	96	160	160	190	190	190
Boiler efficiency — wood	%	90.4	90.1	90.1	90.2	90.2	90.2
Boiler efficiency — pellets	%	90.8	90.5	90.2	90.6	90.5	90.2
Boiler class according to CO emissions (EN 303-5)	—	5	5	5	5	5	5
Flue-gas temperature at nominal output — wood	°C	165	170	185	170	180	185
Flue-gas temperature at nominal output — pellets	°C	145	152	168	148	155	164
Flue-gas mass flow at nominal output — wood	kg/s	0.018	0.02	0.022	0.025	0.028	0.029
Flue-gas mass flow at nominal output — pellets	kg/s	0.005	0.007	0.009	0.012	0.014	0.015
Maximum noise level	dB	65	65	65	65	65	65
Specified fuel — wood	—	Dry wood, calorific value 15–17 MJ/kg, moisture content 12–20%, diameter 80–150 mm	Dry wood, calorific value 15–17 MJ/kg, moisture content 12–20%, diameter 80–150 mm	Dry wood, calorific value 15–17 MJ/kg, moisture content 12–20%, diameter 80–150 mm	Dry wood, calorific value 15–17 MJ/kg, moisture content 12–20%, diameter 80–150 mm	Dry wood, calorific value 15–17 MJ/kg, moisture content 12–20%, diameter 80–150 mm	Dry wood, calorific value 15–17 MJ/kg, moisture content 12–20%, diameter 80–150 mm
Specified fuel — pellets	—	Wood pellets, Ø 6 mm, 35 mm long, moisture content up to 12%; DIN 51 731–HP 5, DIN Plus or EN 14961-2–A1	Wood pellets, Ø 6 mm, 35 mm long, moisture content up to 12%; DIN 51 731–HP 5, DIN Plus or EN 14961-2–A1	Wood pellets, Ø 6 mm, 35 mm long, moisture content up to 12%; DIN 51 731–HP 5, DIN Plus or EN 14961-2–A1	Wood pellets, Ø 6 mm, 35 mm long, moisture content up to 12%; DIN 51 731–HP 5, DIN Plus or EN 14961-2–A1	Wood pellets, Ø 6 mm, 35 mm long, moisture content up to 12%; DIN 51 731–HP 5, DIN Plus or EN 14961-2–A1	Wood pellets, Ø 6 mm, 35 mm long, moisture content up to 12%; DIN 51 731–HP 5, DIN Plus or EN 14961-2–A1
Average fuel consumption — wood	kg/h	6.5	7.8	9.1	10.4	11.75	11.75
Average fuel consumption — pellets	kg/h	2.4–6.9	2.4–6.9	2.4–6.9	3.4–12.5	3.4–12.5	3.4–12.5
Estimated seasonal consumption	—	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	550	650	650	750	750	750
Burn time at nominal output	h	4	4	4	4	4	4
Water capacity of the boiler	l	100	110	110	128	128	128
Recommended buffer tank volume	l	625	750	900	1 000	1 200	1 200
Supply voltage	V / Hz	230 / 50	230 / 50	230 / 50	230 / 50	230 / 50	230 / 50
Heating water temperature setting range	°C	65–90	65–90	65–90	65–90	65–90	65–90