Defro Duo Uni

Boiler type

with feeder

Power range

15, 20, 25, 35, 50 kW

Controller

K1Pv4

Burner

burner UNI

Fuels - automatic furnace

eco-pea coal of grain 5-25 mm, qualified fine coal, mix of cereals grains with eco-pea coal, pellets*

Fuels - substitute furnace

coal (nut coal), wood in pieces, edgings, chips

Thickness of heat exchanger steel

6-10 mm

Standard equipment

DEFRO K1 V2 controller, levelling legs, STRAŻAK (FIRE FIGHTER) extinguishing system

Optional equipment

touch room controller DEFRO SPK LUX with colour display, GSM module, INTERNET module, NZ version for closed system, igniter, ST-61 V4 valve module, set for wireless communication RS

Additional information

*Details of burning pellets can be found in the manual of the boiler

DESCRIPTION

DEFRO DUO UNI boilers are the other 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 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 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.


	heat exchanger made of certified boiler steel
	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 circuit in version DEFRO DUO UNI NZ
	bottom furnace chamber with highly effective trough burner
	bottom furnace chamber with highly effective trough burner
	two furnace chambers: bottom with automatic burner, upper for wood combustion /for manual charging/

(*) - extra payable equipment, installed on Customer’s request

Name of the boiler		Defro Duo Uni
Specification/boiler type	Unit	15	20	25	35	50
Power range	kW	4,5-15	6,0-20	7,5-25	10,5-35	15,0-50
Heating area	m2	1,9	2,4	2,8	3,2	4,4
Area of heated rooms¹	m2	to 200	to 260	to 300	to 370	to 580
Fuel tank capacity²	kg	~178	~178	~178	~228	~228
Optimum thermal efficiency	%	~90,3-90,9
Energy efficiency class	-	D	C	C	C	C
Max. permissible operation pressure	bar	opened system: 1,5 / closed system: 2,5
Required flue gas draught	Pa	24	26	28	31	34
Max. temp. of water on supply	°C	65/80
Boiler weight³	kg	459	502	538	614	777
Boiler water tank capacity	l	80	106	114	120	172
Chimney section	cmxcm	14x14	14x14	15x15	18x18	20x20
Chimney section	Ø mm	160	160	170	200	230
Minimum chimney height	m	7	7,5	8	9	10
Width	mm	1195	1195	1257	1298	1287
Depth	mm	950	1060	1060	1090	1310
Height⁴	mm	1664	1664	1664	1715	1715
Diameter of supply and return Dn	mm	G1 ½”
Diameter of flue	mm	159	159	178	194	194
Supply	V/Hz	~230/50
Maximum power consumption (operation / firing)	W	873/123	873/123	873/123	890/140	890/140
Height to bottom edge of flue	mm	1258	1258	1252	1270	1270
Dimensions of charging chamber and charging hole	width depth height width x height	308 420 203 308 x 398	308 529 191 308 x 398	358 529 228 358 x 398	408 529 253 408 x 398	404 750 223 404 x 398

¹ Maximum area of heated rooms estimated for unit heat demand q=85 W/m².
²Fuel tank capacity for charging density 0,8 kg/dm³.
³ Boiler weight depends on the equipment.
⁴ Height of boiler can be additionally adjusted by means of provided levelling legs.
Legs regulation varies from 38 to 50 mm.
⁵Details of burning pellets can be found in the manual of the boiler.
6 Extra paid option, installed on the customer’s request.