Boilers in closed system
Defro Duo EKOPell NZ
DEFRO DUO EKO PELL boilers were created based on the DEFRO DUO model. The most important difference is a fuel feeder and burner adapted for combustion of biomass in form of pellet from deciduous trees. The most important advantage of these boilers is an advanced automatics - controller servicing central heating and hot utility water pumps and two additional pumps and servicing of mixing valve and self-acting system: of ignition and fuel feeding and cleaning of burner.
Additional chamber created by fixed water-cooled grate, with thickness of wall 8.8 mm, allows periodical combustion of the other fuels - e.g. wood chips - and start-up of boiler in emergency situations. Boilers are equipped with series of sensors monitoring its operation.
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.
|5 years of warranty for heat exchanger tightness, 2 years for the remaining components and efficient operation of boiler|
|heat exchanger made of certified boiler steel /grade P265GH/ of 6-10 mm thickness from steel mills of Arcelor Mittal Poland S.A.|
|APC ADAPTIVE CONTROL ver.1 controller - servicing 4 pumps /central heating, hot utility water, circulation, floor/ control of mixing valve, possibility to connect GSM* module|
high thermal efficiency reaching 92% thanks to increased heat recovery from flue gases
|boiler adapted for installation in closed system in version DEFRO DUO EkoPell NZ|
large furnace chamber with pellet burner
|fuel self-ignition system|
(*) - extra payable equipment, installed on Customer’s request
|Specification / boiler type||Unit||15||20||25||35||50||75|
|Area of heated
||to 260||to 300||to 370||to 580||to 750|
|Capacity of fuel container ***||kg||~235||~235||~235||~235||~308||~308|
|Optimum thermal efficiency||%||~90,1-92,5|
|Max. permissible operation
|Required flue gas draught||Pa||24||26||28||31||34||38|
|Water supply temperature
|Boiler weight ****
|Boiler water tank capacity||l||84||103||117||126||176||210|
|Chimney section||Ø mm||160||160||170||200||230||280|
|Minimum chimney height||m||7||7,5||8||9||10||11|
|Diameter of supply and return Dn||mm||G1 ½”||G2”|
|Maximum power consumption||W
|Height to bottom edge
|Dimensions of substitute combustion
chamber and charging hole
|width x height
||308 x 398
||308 x 398
||358 x 398||408 x 398
||404 x 398
||504 x 398
* 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.
*** Fuel tank capacity for charging density 0.6 kg/dm3
****Boiler weight depends on the equipment.
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