Boilers in closed system
Defro Duo NZ
DEFRO DUO is a flagship boiler with characteristic logo of our company. This innovative design has two combustion chambers - bottom, equipped with automatic fuel feeder with integrated retort burner and upper created by the fixed-mounted tubular water-cooled grate with wall thickness of 8.8 mm. Use of the upper chamber allows using e.g. wood chips as a fuel, it also allows start-up of the boiler in the emergency situations. Grate deck acts also as a water tubes and acts as an additional heat exchange surface. Heat exchanger of boilers 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 series of sensors monitoring its operation. They are adapted for installation of the additional, automatic, water extinguishing system STRAŻAK (FIRE FIGHTER). Version of the boiler with innovative PID 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 K1P with colour touch panel servicing 4 pumps /central heating, hot utility water, circulation, floor pump/ and PID algorithm. Possibility to operate mixing valves, control using GSM or INTERNET*; adjustable angle of position of control panel, PID control|
|high thermal efficiency over 90%|
|boiler adapted for installation in closed system in version DEFRO DUO NZ|
large combustion chamber with highly effective retort burner
|two furnace chamber: bottom with automatic burner, upper for wood combustion /for manual charging/|
|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||~176||~176||~176||~266||~266||~342|
|Optimum thermal efficiency||%||~90,3-90,9|
|Max. permissible operation
|Required flue gas draught||Pa
|Water supply temperature
|Boiler weight ****
|Boiler water tank capacity||l
|Chimney section||Ø mm
|Minimum chimney height||m
|Diameter of supply and return Dn||mm
|Maximum power consumption||W
|Height to bottom edge
|Dimensions of substitute combustion
chamber and charging hole
|width x height||308x398
||308 x 188
||358x 398||408x 398||408x 398||504x 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. 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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