DWB 25kW, Biomass Boiler, Wood Manually Loaded Central Heating Boiler
DWB line of multi fuel wood boilers characterised by a simple, aesthetic and solid construction giving the burner ability to produce hot water for central heating from burning logs, coal, peat, garden waste and other solid fuels.
This biomass boiler was originally made for us in 2006, the DWB and DWBi boilers have evolved to meet requirements of our customers.
These following requirement kept being mentioned;
1 Ability to burn wide variety of fuels.
DWB and DWBi can burn just about anything, from coal and wood through cardboard, plywood, mdf, chipboard to grain, straw and kitchen waste (where legally permissible).
2 Simple in design and operation.
Many of us used or still use an open fire or a stove and have experience of what is involved performing this task. The DWB boiler is not that different. Fill the boiler through middle door, initially lighting the fire at the top, close the door and adjust the draft to suit using the secondary air supply opening and thermostatic lever valve to set boiler temperature. Once boiler water temperature is reached the valve cuts off air supply thus starving fire of oxygen.
3 Solid build and made to last.
Both DWB and DWBi share the same chassis and physical dimension, they are both made for 5-6mm purpose made steel, made to resist heat stretch cracks and corrosion from acidic fuels. From the moment we hold the handle and open the door, the solid well made design is instantly felt. Weld joints are on the water jacket side and kept to minimum with folding carried out through majority of the boiler. Realistic life expectancy is 20+ years.
4 High burn efficiency.
We would have to cut the boiler in half to fully appreciate the design and skilled work that goes in to our boilers. With only the neck of the doors and exhaust, being the only pieces of the boiler that are single skin, rest of the boiler, including bottom grate, firebox and upper tubes are all part of heat exchanger design giving 81-85% efficiency in transferring heat in to water.
5 Engineer free, own servicing.
Majority of our customers are focused on saving money on heating, so a boiler that burns cheap fuel but costs £1000's to service annually doesn't make sense. DWB and DWBi boilers are very simple to maintain and service. Main maintenance functions to carried out are ash emptying every 1-2 weeks and heat exchanger cleaning every 4-12 weeks. The major cleaning takes no longer than 10 minutes. Scraper and shovel are provided.
6 Large fire box.
All of our manually loaded boilers come with extremely large fire boxes, looking at the 30kW unit it has a 80 litre chamber and 40kW is 150 litres. 50cm logs fit straight in.
7 Long refill times.
Large fire box design gives large fuel holding capacity, this gives long refill periods, 12hrs burn times are achievable.
8 Temperature control.
On DWB model, temperature control is done by a screw type thermostatic lever valve. It is a very simple and reliable system proven to work over the last 30+ years .
With the revisions carried out on regular basis, the DWB multifuel boilers are well finished with good solid feel and are able to burn wood, coal and variety of other solid fuels.
Available in power outputs of 12 – 40kW.
Fuel loading is through middle door.
DWB units have hybrid like burn characteristics, combining traditional type where boiler is capable of burning most fuels with gasification style of burning.
Middle door houses a secondary air supply flap, this allows unburned gases to mix with fresh oxygen and reignite, giving a very clean gasification type burn.
Taking a look around the boiler, the front has 3 openings, top, middle and bottom. Top is a door for cleaning heat exchangers, middle door is for filling up with fuel and bottom door is for ash pan access.
To the side is a grate shaker lever, spent gases exit through baffled exhaust located at the rear controlled by lever located on the front top left part of the boiler.
Manufactured out of EN specification 5-6 mm steel plates, laser cut and welded internally.
No electricity is required for this wood and coal boiler to operate, ideally suited for open / vented plumbing type system but can work with pressurised system.
Some amount of supervision is required.
Refills vary with boiler output as does fire box size, but expected burn time, using coal or wood, to be 3-4 hours for smaller units and up to 8-12 hours on bigger machines.
As with the rest of our items this wood boiler is a 100 % European product.
Shape or size may vary slightly as products evolve and are constantly updated.
If you have any questions regarding this or any other product, please get in touch. Details are on 'Contact us' page.