The controller allows easy adjustment of the desired boiler output using a rotary control. The controller controls the output according to the flue gas temperature. A separate button switches the exhaust fan to maximum power for trouble-free fuel loading without smoke.
This unique system provides automatic stable heat (embers), causing the fan to switch off when the level of the fuel decreases. This accurate detection maintains the hot embers layer in the combustion chamber for several hours, reducing the number of times a new fire is started in the boiler per season.
The built-in thermostat with a temperature setting at 60°C and a special structure for mixing inside the boiler protects the boiler. Option of gravity connection to the buffer tank without pumps. Considerable savings during installation and safe operation. 7-year warranty on the boiler body, with no additional conditions. (Optional accessory for selected boilers)
Ensures uniform burning of fuel and allows to burn fuels of various dimensions (wood chips, sawdust, briquettes even lower quality). Pre-drying air, which is supplied (if necessary) into the upper part of the chamber will dry up any damp fuel in order to be able to burn it well and maintain high boiler efficiency and low emission values.
BN and BG models use a special design beam-shaped bottom, which ensures high quality gasification of the fuel with very low emissions. At the same time, it allows operation on chimney draft only.
Where the walls of the stoking chamber are not directly cooled by water – they are hotter, which prevents condensa-tion. The service life of these boilers is many times longer than that of conventional gasification boilers. It also allows the combustion of moist fuel, without significantly reducing the boiler's service life. The increased temperature of the walls prevents the unpleasant deposition of tar in the stoking chamber. The compact gasification chamber is a separate element that is insulated from the walls of the water boiler. The chamber can be replaced.
Provides automatic ash removal from the combustion chamber during combustion, completely eliminating the need to clean it before firing it up again.
1
Stoking - after stoking fuel to whole volume of the stoking chamber the combustion time is up to 8 hours depends on the fuel type and preset boiler output.
2
After 8 hours - when the fuel level decrease under the detection threshold, then the sensor sends signal and controller switch off the fan. This stops the burning process.
3
Up to 12 hours from the first fuel stoking, there are still hot coals (embers) in the chamber, so it is sufficient to add directly bigger logs, start the fan and combustion continues. For other models of boilers with electronic control unit this time reaches up to 24 hours from the first connection.
4
After 12 hours and more after first fuel stoking there will not be hot coals (embers). There will remains fuel residual in the form of charcoal. In such a case is suifficient to start the fan and with small piece of paper fire up the layer of charcoal.
5
After short time the charcoal fires up very well. Then it is possible to add even larger pieces of wood. The residual fuel detection mechanism provides user‘s high operation comfort due to lack of new ignitions, when user must clean the boiler and cut small pieces of wood and wait until the boiler ignites successfully.
Boilers can easily control the distribution of the air entering the fuel (pre-drying air is supplied over the fuel). Therefore the boiler can be adapted to various fuels. This effectively burns fuel that can be easily burn (wood chips, small briquettes), but also fuels that burns hard (large logs, wet wood).
| BNP 17 | BNP 25 | BNP 40 (35) | |
|---|---|---|---|
| mm | mm | mm | |
| A | 1200 | 1200 | 1200 |
| B | 450 | 530 | 714 |
| C | 584 | 664 | 664 |
| D | Ø149 | Ø149 | Ø149 |
| E | G6/4" | G6/4" | G6/4" |
| F | 104 | 104 | 104 |
| G | 939 | 939 | 939 |
| H | G1/2" | G1/2" | G1/2" |
| I | 721 | 721 | 721 |
| J | 471 | 471 | 471 |
| K | G2 1/2" * | G2 1/2" * | G2 1/2" * |
| L | 280 | 370 | 370 |
| M | 100 | 130 | 130 |
| N | 113 | 113 | 113 |
| O | 995 | 995 | 995 |
| P | 200 | 200 | 200 |
| Q | 120 | 120 | 120 |
| R | Ø141 | Ø141 | Ø141 |
| S | 18 | 18 | 18 |
| U | 960 | 1040 | 1040 |
| V | 1176 | 1176 | 1176 |
| W | 680 | 680 | 870 |
| X | 850** | 850** | 850** |
| Y | 225 | 265 | 324 |
| Z | 627 | 707 | 707 |
* cold water inlet to the boiler reduced to G6/4"
** maximum transport dimension after removing the fan
| BNP 17 | BNP 25 | BNP 40 (35) | |
|---|---|---|---|
| Nominal output (kW) | 17 | 26 | 40 |
| Adjustable output (kW) | 4,9–17 | 7,6–26 | 12–40 |
| Efficiency (%) | 90,1 | 90 | 90 |
| Emission class | 5 | ||
| Ecodesign | YES | ||
| Energy class | A+ | ||
| Logs length (mm) | 250 | 330 | 500 |
| Stocking chamber volume (l) | 40 | 80 | 120 |
| Boiler weight (kg) | 245 | 340 | 440 |
| Maximal operation pressure (bar) | 3 | ||
| Exchanger water volume (l) | 32 | 40 | 55 |
| Required chimney draft (Pa) | 10 | 10 | 10 |
