ATTACK 15 DPX PROFI - wood gasification boiler (New)

Product detailed description

ATTACK 15 DPX PROFI – wood gasification boiler with 15 kW output

ATTACK 15 DPX PROFI is a modern gasification (pyrolysis) wood boiler with a rated output of 15 kW, designed for heating family houses, cottages, commercial premises and smaller industrial buildings where quality firewood is available. The DPX Profi 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 intended for common family houses and smaller premises, where emphasis is placed on a balanced price, easy operation and the reliability of proven cast-iron and steel construction.

The 15 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, the firewood in the boiler is not burned all at once, but gradually – first it is gasified (pyrolyzed) in the upper loading chamber under a lack of air, and the resulting combustible gas (a mixture of CO, H2 and hydrocarbons) is then, together with the supplied secondary air, perfectly burned in the ceramic combustion nozzle and lower combustion chamber at temperatures exceeding 900 °C. The result is a longer burning time per load of wood, higher efficiency (typically above 88 %) and significantly lower wood 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 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 15 DPX PROFI gasification boiler, on the other hand, splits combustion into two separate phases taking place in two chambers, one above the other. In the upper loading chamber, wood gasifies at high temperature and with a lack of oxygen (it is not directly burned there), and the resulting combustible wood gas is pushed by the combustion air fan through a ceramic (firebrick) 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 lifespan of both the flue and chimney) and the possibility of smooth output regulation according to current heat demand, since the fan regulates the intensity of combustion instead of manual chimney damper adjustment.

Key features of the ATTACK 15 DPX PROFI boiler

• Wood gasification combustion with two-stage combustion and high efficiency above 88 %, energy class A+.
• Large loading space with a volume of approximately 65 l allowing a larger amount of wood to be loaded and a longer interval between refuelling.
• Turbulators in the heat exchanger – rotary turbulators increase the turbulence of flue gases in the heat exchange area, improve heat transfer to the heating water and reduce the temperature of flue gases leaving into the chimney, thereby increasing the boiler's efficiency.
• Mechanical cleaning of the heat exchanger using an external lever/handle – with just a few movements of the lever, the operator removes ash and soot deposits from the heat exchange surfaces without having to disassemble the boiler.
• Robust cast-iron/steel boiler body construction with increased wall thickness resistant to operational wear and thermal stress.
• Ceramic combustion nozzle and combustion chamber lining made of high-quality firebrick resistant to the high temperatures generated during the burning of wood gas.
• Combustion air fan with output control ensuring an optimal air-to-fuel ratio under varying boiler load.
• Electronic control with display and option of weather-compensated control
• Large service door for convenient access to the combustion chamber, nozzle and heat exchanger for 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 fuel feeding.
• Low emissions and compliance with ecodesign requirements for solid fuel boilers valid in the EU.

Technical parameters of ATTACK 15 DPX PROFI

Differences between the Standard and Profi ranges

The 15 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 via a motorized damper, and the option to connect a room thermostat or weather-compensated control based on outdoor temperature. Thanks to this, the boiler automatically adjusts its output to the current heat demand of the house, saving wood and extending the interval between refuelling. The Profi version also has thicker insulation of the boiler body, which reduces heat loss into the boiler room and increases operating comfort, especially during year-round operation.

Installation and commissioning

ATTACK DPX gasification boilers work with high flue gas temperatures in the combustion chamber and are therefore sensitive to so-called low-temperature corrosion, which occurs if heating 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 heat exchanger walls, which significantly shortens the lifespan 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 temperature of the return water to the boiler at least 60 °C until the boiler heats up to operating temperature. This mixing circuit is also a condition for recognizing the extended warranty on the boiler body (see the Warranty chapter below).

Due to the nature of gasification combustion (the boiler works best at output close to the rated output), we strongly recommend adding a buffer tank to the heating system (e.g. the ATTACK AK or AS range with a suitable volume according to the boiler's output and the area of the heated building). A buffer tank allows the loaded batch of wood to be burned all at once at optimal output, and the heat to be "stored" for later use, 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 lifespan of both the boiler and the flue. Installation, connection to the flue, connection to the electrical network and commissioning should always be carried out by an authorized heating technician/service technician in accordance with the project documentation, valid legislation (especially STN standards and boiler room regulations) 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 the warranty to apply.

Fuel and its preparation

The recommended fuel for the ATTACK 15 DPX PROFI boiler is dry firewood (preferably hard deciduous wood – beech, oak, hornbeam) with moisture content up to 20 %. Wood moisture fundamentally affects both the output and lifespan of the boiler – wet or freshly cut wood (moisture content 40 % or more) significantly reduces the calorific value, causes incomplete gasification, increased tar and soot formation, and can even cause the fire to go out. Wood should therefore be stored 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 approximately 50 cm), with a log thickness of approximately 8–15 cm for even and smooth gasification.

Option of conversion to automatic operation – COMBI Pellet

If in the future you are considering more convenient, automatic operation without the need for daily refuelling with wood, the ATTACK 15 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 intended for ATTACK 25-35 DPX Standard/Profi boilers and includes a burner, pellet hopper and the necessary control electronics, including connection to the boiler's existing control system. When ordering the conversion kit, you need to provide 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 the original wood-burning function can, depending on the version, be retained as a backup (combined wood/pellet operation).

Maintenance and cleaning

Regular maintenance is key to maintaining the high efficiency and long lifespan of the ATTACK 15 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. Mechanical cleaning of the heat exchanger using the external lever should be performed according to the operating manual, ideally once a day during intensive seasonal operation – this will extend the interval between major service cleaning and maintain the boiler's declared efficiency. At least once a year (before the start of the heating season), we recommend having a comprehensive 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 required for the ATTACK 15 DPX PROFI boiler?
It is not a legal requirement, but it is strongly recommended. A gasification boiler works most efficiently at output close to the rated 15 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, output throttling occurs, along with increased tar formation and a shorter boiler lifespan.

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

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

Can the 15 DPX PROFI boiler be converted to pellets later?
Yes, using the DPD30900 conversion kit intended 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 ranges?
Compared to the Standard version, the Profi range brings 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, which brings higher operating comfort and slightly lower fuel consumption during long-term operation.

Who may 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 technician or authorized ATTACK service technician, in accordance with the installation manual and valid legislation. This is also a condition for the warranty to be valid.

What flue diameter does the boiler require?
The ATTACK 15 DPX PROFI boiler is standardly equipped with a chimney connection with a diameter of 150 mm; however, the exact chimney draft and diameter need to be assessed individually according to the height and type of chimney (we recommend consulting a chimney sweep or a designer).

Why choose the ATTACK 15 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 commonly available and service is not dependent on imports from abroad. The 15 DPX PROFI boiler is designed to last 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, ceramic lining of the combustion chamber and well-thought-out mechanical cleaning of the heat exchanger is one of 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 15 DPX PROFI boiler, be guided primarily by the heat loss of the heated building calculated according to the valid standard (STN EN 12831), not just approximately according to the floor area of the house. An undersized boiler cannot cover the heat loss on the coldest days, while, conversely, 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 15 DPX PROFI boiler achieves significantly lower emissions of particulate matter, CO and organic compounds compared to classic bottom-burning wood boilers. 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, which reduces the risk of a soot fire in the chimney and extends the interval needed between cleanings by a chimney sweep.

Warranty

For ATTACK DPX wood gasification boilers, the manufacturer provides a standard warranty of 36 months from the date of commissioning of the boiler, but no more than 42 months from the date of dispatch of the boiler from the factory. If protection against low-temperature corrosion is installed (a mixing circuit maintaining a return temperature of at least 60 °C), it is possible to claim an extended warranty of 7 years on the boiler body. For the warranty to be valid, initial commissioning must be carried out by an authorized ATTACK service technician, and the prescribed method of operation must be followed (especially fuel moisture and protection against low-temperature corrosion). Exact warranty conditions can be found in the warranty certificate supplied with the boiler.