Vigas gasification boilers
Types of Vigas gasification boilers
Vigas log boilers
A Vigas log gasifier lets you use logs from 500mm-600mm long, depending on the size of your boiler, which means less work cutting your wood.
You light a smallish fire in the boiler like you would in a stove and leave it to catch properly. When the fire has caught you load up the firebox with your nice dry logs, shut the door, pull the flue baffle shut, and push the start button and that's it. The fan now comes on and pushes the hot flue gases down through a gasification vent in the centre of the firebox. Inside this vent are holes which supply fresh combustion air to really get those gases burning.
Open the bottom door and you can see the gasification chamber. The hot burning gases rush down through the vent at the top of the chamber into a firebrick lined enclosure which glows red hot (reaching temperatures in excess of 1000ºC). These very hot gases are then drawn to the back of the boiler and through a water filled tube boiler. This extracts the heat from the gases and transfers it into the water in the boiler.
The Vigas is a reverse combustion or downburning boiler (sometimes called 'downdraught boilers' or 'downdraught burners', but this is misleading as downdraught is a common term used to describe a chimney which puffs smoke). In a 'normal' burner the flue gases and smoke go upwards, but in a downburner they are drawn downwards, in this case through the use of a fan. This allows more accurate control of the combustion and the air supply needed for most efficient burning.
The smallest Vigas requires a 150mm flue, the other models 200mm and the minimum height is 5m, which compares rather well to some of the other gasifying boilers on the market.
Sensors monitor the temperature of the water in the boiler and adjust the fan speed accordingly. In the event of the boiler overheating an overheat safety system kicks in which flushes mains cold water through a coil in the boiler. The hot water coming out of this coil is then discharged to a waste pipe and in this way the boiler is cooled down. There are some simple monthly maintenance tasks to keep the Vigas in tip top condition which will take around 10-15minutes, and you do have to empty the ash every so often, although these boilers do make very little ash as they burn the wood so efficiently.
| Vigas log boilers details | ||||
|---|---|---|---|---|
| Vigas 25S | Vigas 40S | Vigas 60S | Vigas 80S | |
| HEIGHT | 1120 MM | 1370 MM | 1420 MM | 1420 MM |
| WIDTH | 645 MM | 645 MM | 785 MM | 785 MM |
| DEPTH | 1070 MM | 1070 MM | 1260 MM | 1650 MM |
| WEIGHT | 430 kg | 460 kg | 760 kg | 930 kg |
| FLUE DIAMETER | 150 MM | 200 MM | 200 MM | 200 MM |
| MAX HEAT OUTPUT | 31 kW | 41 kW | 72 kW | 92 kW |
| NOMINAL HEAT OUTPUT | 25 kW | 40 kW | 60 kW | 80 kW |
| MIN HEAT OUPUT | 5 kW | 8 kW | 15 kW | 25 kW |
| WOOD CONSUMPTION | 7.6 KG/H | 11.2 KG/H | 19 KG/H | 25 KG/H |
| EFFICIENCY | 85 % | 84 % | 82 % | 82 % |
| MAX LOG LENGTH | 500 MM | 500 MM | 700 MM | 1100 MM |
| FIREBOX SIZE | 120lt | 185lt | 315lt | 483lt |
| BOILER VOLUME | 75 l | 93 l | 180 l | 205 l |
| PRICE | £3,937.00 | £5,355.00 | £7,999.00 | £10,296.00 |
