ATTACK 30 DPX PROFI - wood gasification boiler

Product detailed description

ATTACK 30 DPX PROFI – wood gasification boiler with 30 kW output

ATTACK 30 DPX PROFI is a modern gasification (pyrolysis) wood boiler with a nominal output of 30 kW, designed for heating family houses, cottages, businesses and smaller industrial buildings where quality firewood is available. The DPX Profi boiler range combines the proven cast-iron and steel construction of the ATTACK brand with controlled two-stage combustion technology, thanks to which it achieves significantly higher efficiency and lower emissions than classic wood boilers with bottom or top burning. The ATTACK DPX range is a compact gasification boiler designed for common family houses and smaller operations, where emphasis is placed on a balanced price, simple operation and the reliability of a proven cast-iron and steel construction.

The 30 DPX PROFI boiler belongs to energy class A+ and meets current emission requirements (ecodesign) placed on solid fuel boilers in the European Union. Due to the gasification principle, firewood in the boiler is not burned all at once, but gradually – first it is gasified (pyrolysed) in the upper loading chamber under insufficient air supply, and then the resulting combustible gas (a mixture of CO, H2 and hydrocarbons), together with supplied secondary air, is perfectly burned in the ceramic combustion nozzle and lower combustion chamber at temperatures exceeding 900 °C. The result is a longer burn time per load of wood, higher efficiency (typically above 88 %) and considerably lower firewood consumption per kilowatt-hour of heat produced compared to a classic boiler.

How wood gasification works and why it is more efficient

A common wood boiler with bottom burning burns fuel all at once with an insufficiently controlled air supply, which produces a large amount of unburned combustion products (tar, soot, CO) that escape through the chimney and clog the flue. The ATTACK 30 DPX PROFI gasification boiler, on the other hand, divides combustion into two separate phases taking place in two chambers arranged one above the other. In the upper loading chamber, wood gasifies at high temperature and under insufficient oxygen (it is not burned directly), while the resulting combustible wood gas is pushed by the combustion air fan through a ceramic (fireclay) nozzle into the lower combustion chamber. There, the gas mixes with secondary air and burns perfectly at a very high temperature. This process brings three main benefits: significantly higher combustion efficiency, minimal formation of tar and soot (less cleaning, longer service life of the flue and chimney) and the possibility of smoothly regulating output according to current heat demand, since the fan regulates the intensity of combustion instead of manually throttling the chimney.

Key features of the ATTACK 30 DPX PROFI boiler

• Gasification wood combustion with two-stage combustion and high efficiency above 88 %, energy class A+.
• Large loading space with a volume of approximately 90 l, allowing a larger amount of wood to be loaded and a longer interval between refills.
• Turbulators in the heat exchanger – rotary turbulators increase the turbulence of flue gases in the heat exchange area, improve heat transfer into the heating water and lower the temperature of flue gases leaving into the chimney, thereby increasing boiler efficiency.
• Mechanical cleaning of the heat exchanger using an external lever/handle – the operator simply removes ash and soot deposits from the heat exchange surfaces with a few movements of the lever, without having to disassemble the boiler.
• Robust cast-iron/steel construction of the boiler body with increased wall thickness resistant to operational wear and thermal stress.
• Ceramic combustion nozzle and combustion chamber lining made of quality fireclay resistant to high temperatures generated when burning wood gas.
• Combustion air fan with output control ensuring an optimal air-to-fuel ratio at various boiler loads.
• Electronic control with a display and the option of weather-compensated control
• Large service doors for convenient access to the combustion chamber, nozzle and heat exchanger during cleaning and maintenance.
• Safety heat exchanger / option to connect a cooling circuit against boiler overheating (we recommend adding a thermal safety valve in accordance with current Slovak legislation).
• Ready for conversion to automatic operation using the DPD30900 kit for burning pellets (COMBI Pellet), giving the boiler the option of fully automatic feeding.
• Low emissions and compliance with ecodesign requirements for solid fuel boilers valid in the EU.

Technical parameters of ATTACK 30 DPX PROFI

Differences between the Standard and Profi series

The 30 DPX PROFI boiler is equipped with the Profi range, which, compared to the basic Standard version, brings an electronic control unit with a clear display, more precise control of combustion air using a motorized damper, and the option to connect a room thermostat or weather-compensated control based on outdoor temperature. As a result, the boiler automatically adjusts its output to the current heat demand of the house, saving wood and extending the interval between refills. The Profi version also has thicker insulation of the boiler body, which reduces heat losses into the boiler room and increases operating comfort, especially during year-round operation.

Installation and commissioning

ATTACK DPX gasification boilers operate with a high flue gas temperature in the combustion chamber and are therefore sensitive to so-called low-temperature corrosion, which occurs when water that is too cold (below approximately 60 °C) returns to the boiler. During long-term operation with a low return water temperature, acidic combustion products condense on the walls of the heat exchanger, which significantly shortens the service life of the boiler body. We therefore always recommend installing a mixing (three-way) circuit with a thermostatic head in the heating system – for example ATTACK / Oventrop or ESBE LTC361 – which keeps the return water temperature to the boiler at a minimum of 60 °C until the boiler reaches its operating temperature. This mixing circuit is also a condition for granting the extended warranty on the boiler body (see the Warranty chapter below).

Due to the nature of gasification combustion (the boiler works best at an output close to its nominal value), we strongly recommend supplementing the heating system with a buffer tank (e.g. the ATTACK AK or AS range with a suitable volume according to the boiler output and the heated area). A buffer tank allows the loaded batch of wood to be burned all at once at optimal output, storing the heat as a reserve, from which it is gradually drawn into the heating circuit throughout the day. Without a buffer tank, the boiler's output is frequently throttled, which increases tar formation, reduces efficiency and shortens the service life of both the boiler and the flue. Installation, connection to the flue, connection to the electrical network and initial commissioning should always be carried out by an authorized heating engineer/service technician in accordance with the project documentation, applicable legislation (particularly Slovak technical standards and regulations on boiler rooms) and the manufacturer's installation manual. Initial commissioning should be carried out by an authorized ATTACK service technician, which is also one of the conditions for claiming the warranty.

Fuel and its preparation

The recommended fuel for the ATTACK 30 DPX PROFI boiler is dry firewood (preferably hard deciduous wood – beech, oak, hornbeam) with a moisture content of up to 20 %. The moisture content of wood fundamentally affects both the output and the service life of the boiler – wet or freshly cut wood (moisture content of 40 % or more) significantly reduces the calorific value, causes incomplete gasification, increased formation of tar and soot, and can even lead to the fire going out. Therefore, store wood for at least 1–2 heating seasons under a well-ventilated shelter. The length of the logs should correspond to the dimensions of the boiler's loading chamber (usually up to approx. 50 cm), and the log thickness should be approx. 8–15 cm for even and smooth gasification.

Option of conversion to automatic operation – COMBI Pellet

If in the future you consider more convenient, automatic operation without the need to add wood every day, the ATTACK 30 DPX PROFI boiler can be additionally converted to burn wood pellets using the DPD30900 kit with a 30 kW pellet burner. This conversion kit is designed for ATTACK 25-35 DPX Standard/Profi boilers and includes a burner, a pellet hopper and the necessary control electronics, including connection to the boiler's existing control system. When ordering the conversion kit, you need to report the serial number of the specific boiler to which the kit will be fitted, so that the service technician can verify compatibility and prepare the correct components. After conversion, the boiler works as a fully automatic pellet heat source, while, depending on the version, the original wood-burning function can be kept as a backup (combined wood/pellet operation).

Maintenance and cleaning

Regular maintenance is key to maintaining the high efficiency and long service life of the ATTACK 30 DPX PROFI boiler. We recommend emptying the ash pan and the space under the grate according to the intensity of heating, usually several times a week. Perform mechanical cleaning of the heat exchanger using the external lever according to the operating manual, ideally once a day during intensive seasonal operation – this will extend the interval between major service cleanings and maintain the declared efficiency of the boiler. At least once a year (before the start of the heating season), we recommend having a complete service inspection of the boiler carried out, including checking the door seal, the condition of the ceramic nozzle, the combustion chamber lining, and the functionality of the fan and control system.

Frequently asked questions

Is a buffer tank needed for the ATTACK 30 DPX PROFI boiler?
It is not a legal requirement, but it is strongly recommended. A gasification boiler works most efficiently at an output close to its nominal 30 kW, so a buffer tank allows a batch of wood to be burned all at once under optimal conditions and the heat to be stored for later use. Without it, the output is throttled, tar formation increases and the boiler's service life is reduced.

What is the recommended moisture content of the wood?
The recommended moisture content of firewood is up to 20 %, which usually corresponds to wood that has been dried for at least 1–2 years under a shelter. Wetter wood reduces efficiency and increases the risk of the heat exchanger and chimney becoming clogged.

What is low-temperature corrosion and how can it be avoided?
This is damage to the boiler body caused by the condensation of acidic combustion products at too low a return water temperature. It is resolved by installing a mixing (three-way) circuit that keeps the water returning to the boiler at a minimum of 60 °C.

Can the 30 DPX PROFI boiler be converted to pellets later?
Yes, using the DPD30900 conversion kit designed for 25-35 DPX Standard/Profi boilers, which adds a pellet burner and the necessary control electronics to the boiler for fully automatic operation.

What is the difference between the Standard and Profi series?
Compared to the Standard version, the Profi series offers more precise electronic control with a display, the option of weather-compensated control based on outdoor temperature, and usually thicker insulation of the boiler body, resulting in higher operating comfort and slightly lower fuel consumption during long-term operation.

Who is allowed to carry out the initial commissioning of the boiler?
Initial commissioning, connection to the flue and the electrical network should always be carried out by an authorized heating engineer or an authorized ATTACK service technician, in accordance with the installation manual and applicable legislation. This is also a condition for the warranty to be valid.

What flue diameter does the boiler require?
The ATTACK 30 DPX PROFI boiler is standardly equipped with a chimney connection with a diameter of 180 mm; however, the exact chimney draft and diameter must be assessed individually according to the height and type of chimney (we recommend consulting a chimney sweep or designer).

Why choose the ATTACK 30 DPX PROFI

ATTACK is a Slovak boiler manufacturer with a long tradition and an extensive service network throughout Slovakia, which is a great advantage when heating with solid fuel – spare parts (ceramic nozzles, seals, fans, control units) are readily available and service does not depend on imports from abroad. The 30 DPX PROFI boiler is designed to last for decades of operation provided the recommended conditions are met (protection against low-temperature corrosion, quality dry wood, regular maintenance). The combination of cast-iron and steel components, a ceramic lining of the combustion chamber, and a well-thought-out mechanical heat exchanger cleaning system are among the proven solutions, tested over the years in practice, appreciated by both installation companies and end customers in everyday operation.

When choosing the output of the 30 DPX PROFI boiler, be guided primarily by the heat loss of the heated building calculated according to the current standard (STN EN 12831), not just roughly according to the floor area of the house. An undersized boiler will not be able to cover the heat loss on the coldest days, while, on the other hand, a significantly oversized boiler works more often at partial output, which, for solid fuel boilers, reduces efficiency and increases tar formation. If in doubt about the correct choice of output, we recommend consulting a heating designer or directly an ATTACK sales representative.

Emissions and environmentally friendly operation

Thanks to two-stage controlled combustion and a high operating temperature in the combustion chamber, the ATTACK 30 DPX PROFI boiler achieves significantly lower emissions of particulate matter, CO and organic compounds compared to classic wood boilers with bottom burning. The boiler meets the requirements of the ecodesign regulation (Directive 2009/125/EC and related implementing regulations) placed on solid fuel boilers placed on the market in the EU. Lower emissions also mean fewer deposits in the chimney and flue, reducing the risk of a soot fire in the chimney and extending the interval needed between chimney sweep cleanings.

Warranty

For ATTACK DPX wood gasification boilers, the manufacturer provides a standard warranty of 36 months from the date the boiler is put into operation, but no more than 42 months from the date the boiler is dispatched from the factory. With installed protection against low-temperature corrosion (a mixing circuit maintaining a return temperature of at least 60 °C), an extended 7-year warranty on the boiler body can be applied. For the warranty to be valid, the initial commissioning must be carried out by an authorized ATTACK service technician and the prescribed operating method must be followed (particularly fuel moisture content and protection against low-temperature corrosion). Please find the exact warranty conditions in the warranty card supplied with the boiler.