The HDG Navora is a 20kW gasification wood burning boiler for use with wood logs and clean wood waste. The fuelling chamber volume is 155 litres which will produce approximately 172kWh from softwood and 220kWh from hard wood per fuelling.
What is special about HDG Navora 20kW
Fuel
Spit log wood up to half-metre lengths (19"), Pressed wood briquettes, Coarse cuttings and lumped wood waste
Area of application
Private households, Agriculture and forestry Commercial businesses
Very user-friendly and convenient, Very long intervals between refills, Low emissions
Special features
91 % efficiency, Automatic cleaning of heat exchanger surfaces upon operation of the bypass damper, Operated entirely from the front, Meets the missions controls and safety requirements of most European countries, Awarded the German KWF prize for innovation
Combustion-controlled, bottom-burning wood boiler. Type-tested to DIN EN 303-5 and DIN 4751-2, certified to EC Pressure Equipment Directive 97/23/EC. Pressure-tested, welded furnace body made of 5-6 mm tested boiler steel, fully lined filling chute (with heat-resistant special steel panels at particularly exposed points), sheet steel furnace lining, pre-assembled, powder-coated in green (RAL 6011) or yellow (RAL 1007) 80 mm glass wool insulation, safety heat exchanger fitted as standard.
Large fueling chamber (150 liters, 560 mm deep) for logs up to 500mm and coarsely chopped wood for long refill intervals; highly temperature-resistant burn-off nozzle with special downstream combustion chamber for minimum emissions and maximum efficiency; power-controlled suction draught ventilator with servo drive for separate primary and secondary air control; oxygen and flue temperature sensors fitted ready to plug in; ergonomic design for convenient fueling using the large front hatch.
HDG Lambda Control 1 boiler control units The boiler control units of HDG Lambda Control have ingenious combustion control systems. The combustion values are determined through the oxygen sensor and the flue gas sensor. These values are evaluated and the primary and secondary air flaps then precisely regulated for continuously optimal values even under variable conditions.
Overview
Technical Information
System type
HDG Navora 20kW
Nominal thermal output
20kW
Minimum thermal output
18kW
Fueling chamber volume
150 Litres
Fueling chamber depth
560mm
Maximum boiler temperature
95 deg C
Max. operating pressure
3 bar
Required flue draught
15 pa (0.06"wg)
Water content
168 Litres
Weight
680kg
Electrical connection
230AC, 50Hz
Flue connection size
150 mm (6")
HDg Lamba Control 1
Intelligent emission management In the HDG Lambda-Control 1, the following parameters are continually measured and also shown on the display:
The residual oxygen in the flue gas (with the aid of the oxygen probe), in order to achieve optimal combustion.
The exhaust air temperature (with the aid of the flue gas temperature sensor), in order to achieve a constant degree of efficiency;
The temperatures of the boiler and acumulator storage tank, in order to determine their operating statuses..
Price list for HDG wood pellet, wood chip, split log heating systems 
Navora log wood boiler, front view
