ATTACK 15 DPX STANDARD - wood gasification boiler (New)

Product detailed description

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

ATTACK 15 DPX STANDARD 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 Standard series boiler 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 series is a compact gasification boiler designed for ordinary 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 STANDARD boiler belongs to energy class A+ and meets current emission requirements (ecodesign) imposed 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 (pyrolyzed) in the upper loading chamber with insufficient air supply, and the resulting combustible gas (a mixture of CO, H2 and hydrocarbons) together with the supplied secondary air is then perfectly burned in the ceramic combustion nozzle and lower combustion chamber at temperatures exceeding 900 °C. The result is a longer burning time per wood load, higher efficiency (typically above 88 %) and considerably 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 conventional wood boiler with bottom burning burns the fuel all at once with insufficiently controlled air supply, producing a large amount of unburned combustion products (tar, soot, CO) which escape through the chimney and clog the flue. The ATTACK 15 DPX STANDARD gasification boiler, on the other hand, divides combustion into two separate phases taking place in two chambers, one above the other. In the upper loading chamber, wood gasifies at high temperature with 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 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 STANDARD boiler

• Gasification wood combustion with two-stage combustion and high efficiency above 88 %, energy class A+.
• Large loading chamber 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 – rotating 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, which increases 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 the high temperatures generated by burning wood gas.
• Combustion air fan with output regulation ensuring the optimal air-to-fuel ratio at various boiler loads.
• Electronic fan control ensuring stable combustion in the simpler design of the Standard series.
• Large service door 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 applicable Slovak legislation).
• Ready for conversion to automatic operation using the DPD30900 kit for burning pellets (COMBI Pellet), giving the boiler fully automatic fuel feeding capability.
• Low emissions and compliance with ecodesign requirements for solid fuel boilers applicable in the EU.

Technical parameters of ATTACK 15 DPX STANDARD

Differences between the Standard and Profi series

The 15 DPX STANDARD boiler in the Standard design is controlled by simpler electronic regulation of the combustion air fan, which ensures stable combustion and good efficiency at a lower purchase cost compared to the Profi series. It is a proven and undemanding solution suitable especially for smaller and medium-sized households, where full automation or weather-compensated control is not necessary. If you later require more precise output control based on outdoor temperature, we recommend considering the related DPX Profi model of the same output.

Installation and commissioning

ATTACK DPX gasification boilers operate with high flue gas temperature in the combustion chamber and are therefore sensitive to so-called low-temperature corrosion, which occurs if heating water that is too cold (below approx. 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 fitting the heating system with a mixing (three-way) circuit with a thermostatic head – for example ATTACK / Oventrop or ESBE LTC361 – which maintains the return water temperature to the boiler at at least 60 °C until the boiler reaches operating temperature. This mixing circuit is also a condition for recognition of 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 rated output), we strongly recommend supplementing the heating system with a storage tank (e.g. the ATTACK AK or AS series with a suitable volume according to the boiler output and the heated area). The storage tank allows the loaded batch of wood to be burned at once at optimal output and the heat to be "stored" for later use, from which it is gradually drawn into the heating circuit during the day. Without a storage tank, the boiler 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 technician/service technician in accordance with the project documentation, applicable legislation (especially STN 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 warranty claims.

Fuel and its preparation

The recommended fuel for the ATTACK 15 DPX STANDARD boiler is dry firewood (preferably hardwood – beech, oak, hornbeam) with a moisture content of up to 20 %. Wood moisture significantly affects both the output and the service life of the boiler – wet or freshly cut wood (moisture 40 % or more) considerably reduces the heating value, causes incomplete gasification, increased tar and soot formation, and can even lead to combustion extinguishing. 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 approx. 50 cm), with a log thickness of approx. 8–15 cm for even and smooth gasification.

Option of conversion to automatic operation – COMBI Pellet

If you are considering more convenient, automatic operation in the future without the need for daily loading of wood, the ATTACK 15 DPX STANDARD boiler can be subsequently converted to burn wood pellets using the DPD30900 kit with a pellet burner with an output of 30 kW. 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 existing boiler control system. When ordering the conversion kit, the serial number of the specific boiler to which the kit will be fitted must be provided 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 design, be retained 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 15 DPX STANDARD boiler. We recommend emptying the ash pan and the space under the grate according to the heating intensity, usually several times a week. Mechanical cleaning of the heat exchanger using the external lever should be carried out according to the operating manual, ideally once a day during intensive seasonal operation – this will extend the interval between larger service cleanings 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 storage tank needed for the ATTACK 15 DPX STANDARD boiler?
It is not a legal requirement, but it is strongly recommended. The gasification boiler works most efficiently at an output close to its rated 15 kW, so a storage tank allows a batch of wood to be burned at once under optimal conditions, storing the heat for later use. Without it, output throttling occurs, along with increased tar formation and a shorter boiler service life.

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 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 condensation of acidic combustion products when the return water temperature is too low. 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 STANDARD 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 series?
Compared to the Standard design, the Profi series offers more precise electronic control with a display, the possibility of weather-compensated control based on outdoor temperature, and usually thicker insulation of the boiler body, providing greater operating comfort and slightly lower fuel consumption during long-term operation.

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

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

Why choose the ATTACK 15 DPX STANDARD

ATTACK is a Slovak boiler manufacturer with a long-standing 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 servicing does not depend on imports from abroad. The 15 DPX STANDARD 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 combustion chamber lining and well-designed mechanical heat exchanger cleaning is among the proven solutions, tested over years in practice, appreciated by both installation companies and end customers in everyday operation.

When choosing the output of the 15 DPX STANDARD boiler, base your decision primarily on the heat loss of the heated building calculated according to the applicable standard (STN EN 12831), not just approximately according to the house's floor area. An undersized boiler cannot cover the heat loss on the coldest days, while a significantly oversized boiler more often operates at partial output, which reduces efficiency and increases tar formation in solid fuel boilers. If in doubt about the correct output choice, we recommend consulting a heating designer or directly an ATTACK sales representative.

Emissions and environmentally friendly operation

Thanks to two-stage controlled combustion and high operating temperature in the combustion chamber, the ATTACK 15 DPX STANDARD boiler achieves significantly lower emissions of particulate pollutants, 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) imposed 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 chimney soot fire and extends 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 of boiler commissioning, 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), an extended 7-year warranty on the boiler body can be applied. For the warranty to be valid, initial commissioning must be carried out by an authorized ATTACK service technician and the prescribed method of operation (especially fuel moisture and protection against low-temperature corrosion) must be observed. Exact warranty conditions can be found in the warranty card supplied with the boiler.