Boilers in closed system
Defro Duo Uni NZ
DEFRO DUO UNI boilers are another two-furnace boilers. Bottom chamber is equipped with innovative trough burner allowing combustion of eco pea coal, qualified fines and crops grains. Upper chamber is created by fixed water-cooled grate, allowing periodical combustion of the other fuels and start-up of boiler in emergency situations. Heat exchanger is completely made of boiler steel of thickness 6-10 mm, while the individual components endangered with action of flames and substances in the flue gases - are made of thickness even 10-12 mm. Boilers are equipped with components increasing operational safety e.g. flap opening sensor, double protection against ignition of fuel in hopper - first implemented by the controller, the second - by automatic, water extinguishing system STRAŻAK (FIRE FIGHTER). Version with innovative controller with touch panel is available as a standard.
Reinforced version NZ with installed cooling coil pipe and compete protective fixtures allowing installation in closed system. NZ version requires extra payment, according to the Boilers Equipment Price List.
|heat exchanger made of certified boiler steel /grade P265GH/ of 6-10 mm thickness from steel mills of Arcelor Mittal Poland S.A.|
|controller K1 with colour touch panel servicing 4 pumps /central heating, hot utility water, circulation, floor pump/. Possibility to operate mixing valves, control using GSM or INTERNET*; adjustable angle of control panel|
|5 years of warranty for heat exchanger tightness, 2 years for the remaining components and efficient operation of boiler|
high thermal efficiency reaching 90% thanks to increased heat recovery from flue gases
|boiler adapted for installation in closed system in version DEFRO DUO UNI NZ|
|bottom furnace chamber with highly effective trough burner|
|automatic water fire suppression system with thermostatic valve|
|two furnace chamber: bottom with automatic burner, upper for wood combustion /for manual charging/|
(*) - extra payable equipment, installed on Customer’s request
|Specification / boiler type||Unit||15||20||25||35||50|
|Area of heated
||to 300||to 370||to 580|
|Capacity of fuel container ***||kg||~178||~178||~178||~228||~228|
|Optimum thermal efficiency||%||~90,3-90,9|
|Max. permissible operation
|Required flue gas draught||Pa||24||26||28||31||34|
|Water supply temperature
|Boiler weight *****
|Boiler water tank capacity||l||80||106||114||120||172|
|Chimney section||Ø mm||160||160||170||200||230|
|Minimum chimney height||m||7||7,5||8
|Diameter of supply and return Dn||mm||G1 ½”|
|Maximum power consumption||W
|Maximum power consumption||mm
|Dimensions of substitute combustion
chamber and charging hole
|width x height||308x398
* Maximum area of heated rooms estimated for unit heat demand q=85 W/m2.
** Height of boiler can be additionally adjusted by means of provided levelling legs. Legs regulation varies from 38 to 50 mm.
*** Fuel tank capacity for charging density 0.8 kg/dm3
***** Boiler weight depends on the equipment.
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