100 mm
Insulation layer
Solar
Connection to solar panel
5000 L
Tank sizes from 204 – 5000 L
Robotic
Welded with high precision
ATTACK AK is a basic type of buffer tank that accumulates excess energy from the heating element and subsequently uses it later according to your needs. The AK tank is used only for the accumulation of heating water. Compared to the basic clean AK tank, the ATTACK AS accumulation tank model is equipped with one heat exchanger, which you can easily connect to a solar system.
Standard buffer tank AK and AS
We produce both types of buffer tanks, AK and AS, with a wide choice of cylinder volumes from 204 to 4,940 liters. The buffer tank is robotically welded, which extends its service life. It increases the performance and efficiency of the boiler. At full power and optimal efficiency, you consume less fuel, making heating more ecological. Another advantage is the minimal amount of tar and acids during combustion and consequently a long service life of the boiler and chimney.
ATTACK AK
ATTACK AS
Standard buffer tank and heating methods
The buffer tank can be combined with various heating methods (accumulation electricity, solar devices, or heat pumps); a combination with radiators and underfloor heating is of course also possible.
Thermal insulation
So that your buffer tank preserves heat better. Every standard ATTACK AK and AS buffer tank comes with a soft removable insulation layer included in the price of the tank. 100 mm thick insulation made of polyester fibers with a leatherette cover is attached to the tank after installation, and the insulation takes care of the rest.
At full power and optimal efficiency, you consume less fuel
The advantage of connecting a boiler with an buffer tank is its operation at rated power, achieving a minimal amount of tar and acids during combustion and consequently a long service life of the boiler and chimney.
Technical data and documents for download
The AK, AS buffer tank with its properties can effectively help a biomass boiler improve performance and extend service life. Find out more about other technical data.

- Thick insulation 100mm
- Possibility of connection with a solar system
- Extends the service life of the boiler and chimney
- Increases boiler performance and efficiency
- Cylinder volumes from 204 to 4,940 L
- Robotically welded
Standard accumulation tank ATTACK AK |
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| Type | AK200K | AK300K | AK400K | AK500K | AK800K | AK1000K | AK1500K | AK2000K | AK2500K | AK3000K | AK4000K | AK5000K |
| Position 1–5 | 925 | 1 110 | 1 120 | 1 405 | 1 545 | 1 735 | 1 755 | 1 955 | 2 005 | 2 205 | 2 385 | 2 285 |
| Position 2–6 | 705 | 790 | 815 | 1 013 | 1 135 | 1 255 | 1 345 | 1 409 | 1 465 | 1 600 | 1 730 | 1 680 |
| Position 3–7 | 455 | 460 | 515 | 621 | 725 | 775 | 820 | 862 | 915 | 985 | 1 065 | 1 065 |
| Position 4–8 | 205 | 210 | 210 | 230 | 315 | 295 | 375 | 315 | 375 | 375 | 405 | 455 |
| L – max. length of the electric heating body |
550 | 600 | 700 | 700 | 840 | 840 | 1 050 | 1 150 | 1 250 | 1 300 | 1 450 | 1 650 |
| ∅ D1 – Diameter without insulation |
500 | 550 | 650 | 650 | 790 | 790 | 1 000 | 1 100 | 1 200 | 1 250 | 1 400 | 1 600 |
| ∅ D2 – Diameter with insulation of 100 mm |
700 | 750 | 850 | 850 | 990 | 990 | 1 200 | 1 300 | 1 400 | 1 450 | 1 600 | 1 800 |
| Height | 1 140 | 1 350 | 1 380 | 1 660 | 1 840 | 2 030 | 2 095 | 2 310 | 2 387 | 2 596 | 2 819 | 2 770 |
| Height with insulation of 100 mm | 1 190 | 1 400 | 1 430 | 1 710 | 1 890 | 2 080 | 2 145 | 2 360 | 2 437 | 2 646 | 2 869 | 2 820 |
| R – lope dimension without insulation |
1 157 | 1 368 | 1 402 | 1 678 | 1 864 | 2 052 | 2 142 | 2 353 | 2 438 | 2 643 | 2 872 | 2 845 |
| Max. operating pressure (bar) | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 |
| Max. operating temperature ( °C) | 95 | 95 | 95 | 95 | 95 | 95 | 95 | 95 | 95 | 95 | 95 | 95 |
| Volume (l) | 204 | 289 | 405 | 488 | 732 | 915 | 1 449 | 1 980 | 2 435 | 2 915 | 3 819 | 4 940 |
| Weight (kg) | 46 | 60 | 73 | 81 | 109 | 118 | 201 | 235 | 271 | 363 | 475 | 578 |
Standard accumulation tank with an exchanger ATTACK AS |
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| Tank | Type | AS500K | AS800K | AS1000K | AS1500K | ||||||||
| Position 1–5 | 1 405 | 1 545 | 1 735 | 1 755 | |||||||||
| Position 2–6 | 1 013 | 1 135 | 1 255 | 1 345 | |||||||||
| Position 3–7 | 621 | 725 | 775 | 820 | |||||||||
| Position 4–8 | 230 | 315 | 295 | 375 | |||||||||
| Position RS | 230 | 315 | 295 | 375 | |||||||||
| Position AS | 710 | 725 | 860 | 895 | |||||||||
| L – max. length of the electric heating body | 700 | 840 | 840 | 1 050 | |||||||||
| ∅ D1 – Diameter without insulation |
650 | 790 | 790 | 1 000 | |||||||||
| ∅ D2 – Diameter with insulation of 100 mm |
850 | 990 | 990 | 1 200 | |||||||||
| Height | 1 660 | 1 840 | 2 030 | 2 095 | |||||||||
| Height with insulation of 100 mm | 1 710 | 1 890 | 2 080 | 2 145 | |||||||||
| R – Slope dimension without insulation |
1 678 | 1 864 | 2 052 | 2 142 | |||||||||
| Max. operating pressure (bar) | 3 | 3 | 3 | 3 | |||||||||
| Max. operating temperature ( °C) | 95 | 95 | 95 | 95 | |||||||||
| Solar exchanger | Area of exchanger (m²) | 1,8 | 2,4 | 3 | 3,6 | ||||||||
| Volume of exchanger (l) | 11,9 | 15,9 | 19,8 | 23,7 | |||||||||
| Max. operating pressure (bar) | 10 | 10 | 10 | 10 | |||||||||
| Tank | Volume (l) | 474 | 713 | 891 | 1 420 | ||||||||
| Weight (kg) | 118 | 157 | 172 | 265 | |||||||||
High-quality processing
All our products are manufactured with an emphasis on the selection of quality materials and the use of correct technologies and procedures. A robotically welded tank ensures maximum product reliability. Our own know-how is a guarantee of reliable service and long life.
Standard buffer tank ATTACK AK, AS
LEGEND
1 – Riser boiler – 1 ½“
2 – Freely available – 1 ½“
3 – Freely available – 1 ½“
4 – Return heating circuit – 1 ½“
5 – Riser heating circuit (radiators) – 1 ½“
6 – Riser heating circuit (floor) – 1 ½“
7 – Return gas, oil, and pellet boiler – 1 ½“
8 – Return wood boiler – 1 ½“
9 – Solar system or heating sensor – ½“
AS – Riser solar system – 1″
RS – Return solar system – 1″
D1 – Diameter without insulation
D2 – Diameter with insulation
Choose a service partner for installation
Creating a high-quality and prompt service network for our customers is very important to us. Our service partners provide prompt service assistance to every customer throughout the year.





