Defro Duo Pellet

The DEFRO DUO PELLET boilers have been created on the basis of the DEFRO DUO series. The main difference consists in the fuel charger and burner adjusted for trees' leaf biomass in the form of pellets. The biggest advantage of the boilers constitute advanced automatics - programmer controlling central heating, hot utility water and two other pumps as wells as the mixing valve and the self-acting system: ignition, fuel charging and burner cleaning.
The additional chamber created by a stationary grate cooled by water (wall thickness: 8.8 mm) allows for temporary use of other types of fuel such as wood chips and boiler start-up in emergency cases. The boilers are equipped with a number of sensors controlling its work. Moreover, the charge container can be equipped with a lamp increasing the comfort of operation.

Fuel type:

primary

substitute

pellet

coal

wood

Boiler’s advantages:

	5-year warranty for heat exchanger tightness, 2-year warranty for other elements and efficient operation of the boiler;
	the exchanger has been made from certified boiler steel ( P256GH type) of thickness of 6-10 mm, delivered by the following steel plants: Arcelor Mittal Poland S.A, Kraków branch and U. S. Steel Košice s.r.o.;
	high thermal efficiency, up to 92%, thanks to increased heat recovery from flue gas;
	self-acting fuel ignition system connected to the automatic burner cleaning system;
	two combustion chambers: lower with an automatic retort burner and upper for burning wood (when charged manually);
	electronic boiler regulation; innovative controller with a touch screen cooperating with up to 4 pumps (central heating, hot utility water, circulatory and floor pump) and with the possibility of controlling mixing valves*;
	internal lamp for the charge container*;
* additional option, installed at customer request

Technical data
Specification/boiler type	Unit	15	25	35	50	75
Nominal output	kW	8-24	10-31	13-42	16-53	23-75
Heating surface	m²	2,1	2,8	3,8	4,8	6,7
Heated room surface	m²	up to 200	up to 250	up to 320	up to 480	up to 700
Single fuel load	kg	~180	~180	~350	~350	~400
Optimum heating efficiency	%	90,1-92,5	90,1-92,5	90,1-92,5	90,1-92,5	90,1-92,5
Max. work pressure allowed	bar	1,5	1,5	1,5	1,5	1,5
Required chimney flue	Pa	20	25	30	35	38
Water temp. on supply max	°C	85	85	85	85	85
Boiler weight	kg	548	609	711	897	1041
Boiler water capacity	l	76	99	110	122	197
Chimney cross section	cm x cm ø mm	14x14 160	16x16 180	19x19 210	21x21 230	25x25 280
Minimum chimney height	m	6	6	7	9	10
Power supply	V/Hz	230/50	230/50	230/50	230/50	230/50
Power consumption - boiler start-up	W	287 (272)	287 (272)	316 (301)	316 (301)	316 (301)
Power consumption - boiler operation	W	97 (82)	97 (82)	126 (111)	126 (111)	126 (111)
Width	mm	1915	1965	2115	2115	2215
Depth	mm	925	1031	1065	1283	1295
Height*	mm	1672	1672	1739	1739	1878
Supply and return diameter Dn	mm	G 1_1/2"	G 1_1/2"	G 1_1/2"	G 1_1/2"	G 2"
Flue pipe dimension	mm	ø159	ø179	ø194	ø194	ø245
*Boiler’s height can be additionally regulated by the use of the feet attached to it. The feet can regulate height by 38-50mm.




	A*	B*	C	D*	E*	F	G	H	I	J	K	L
15	115	1257	Ø159	1712	1539	498	535	1800	533	210	945	732
25	115	1257	Ø179	1712	1539	548	535	1900	641	210	1053	732
35	115	1305	Ø194	1759	1591	598	775	2400	641	240	1083	865
50	115	1305	Ø194	1759	1591	598	775	2400	865	240	1307	865
75	153	1402	Ø245	1898	1591	718	775	2550	865	250	1317	865

* In case of disclaimers of regulatory dimension increases from min. 38 to max. 50 mm.

The table below shows the dimensions of the opening for filling and combustion chamber.

	A (Width)	B (Depth)	C (Height)	D (Width x Height)
15	310	370	310	310x190
25	360	480	310	360x190
35	405	480	360	405x190
50	405	700	360	405x190
75	500	700	410	500x235

DEFRO Company reserves the right to change without notice the technical parameters, equipment and specifications of our products. Contained on this page to ensure the information is not in the meaning. 4. 3 and 4 of the Act of 27 July 2002 on the specific terms of consumer sales and amending the Civil Code (the "Act") and do not describe the purpose of a product. 4. 2 of the Act. This site does not constitute an offer within the meaning of. 1966 Civil Code.