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Sigma E is a modern and ecological boiler fulfills the highest standards of cleanliness and efficiency. It is a leader in the 5th class of eco-pea coal boilers and is certified by Ecodesign. The boiler uses a new and patented retort burner, also changes in the water jacket, thanks to which the furnace is economical and has low exhaust emissions. The Sigma E boiler has been equipped with a mechanical cleaning system for the exchanger and an intuitive touch screen controller. The boiler construction was made of high quality materials, and new ceramic catalysts were placed around the furnace.
The boilers meet the energy and emission requirements of class 5 of the PN EN 303-5: 2012 standard and have the Ecodesign Certificate.
Elements of additional equipment should be reported when ordering the boiler due to the lack of possibility of subsequent installation.
- additional ceramic catalysts placed around the furnace
- dedicated deflector
- mechanical exchanger cleaning system

The boiler heat exchanger was made of certified boiler steel / grad. P265GH / 6 mm thick

High boiler thermal efficiency of up to 88% thanks to increased heat recovery from outgoing boiler fumes

ADAPTIVE CONTROL control - regulation of boiler operation based on air flow through the exchanger

The possibility of changing the direction of opening the external door,

NZ version with reinforced construction and built-in coil adapted to work in a closed system (optional extra payment, installed on customer's request)

Combustion chamber with a highly efficient retort burner inside

feed screw made entirely from one piece

Fuel tank lid open sensor installed

Pressure equalizing system in the fuel tank

The manufacturer grants a 5-year warranty on the tightness of the heat exchanger and 2-year smooth operation of the boiler and other elements.

System enabling mechanical cleaning of the heat exchanger (in standard)

Energy-saving geared motor with reverse in case of blocking the fuel feeder

The K1P v4 controller with a colored touch panel can support 4 pumps (heat, DHW, circulation, floor) and a mixing valve. As an option it is possible to control via GSM or INTERNET (additionally payable).

Stabilization of the combustion process by a ceramic catalyst


Type / Dimensions | A* | B* | C | D* | E* | F* | G | H | I | J | K | L | poz.6 | poz.7 | poz.8 |
| 12 | 130 | 775 | Ø159 | 1115 | 1225 | 1405 | 825 | 115 | 1065 | 605 | 640 | 1360 | G 1 ½" | G 1 ½" | G ½" |
| 16 | 130 | 940 | Ø159 | 1280 | 1385 | 1405 | 825 | 115 | 1065 | 605 | 640 | 1360 | G 1 ½" | G 1 ½" | G ½" |
| 20 | 130 | 920 | Ø178 | 1280 | 1385 | 1405 | 865 | 115 | 1110 | 605 | 640 | 1360 | G 1 ½" | G 1 ½" | G ½" |
| 24 | 130 | 1070 | Ø178 | 1430 | 1535 | 1405 | 865 | 115 | 1110 | 574 | 640 | 1360 | G 1 ½" | G 1 ½" | G ½" |
| 36 | 130 | 1115 | Ø178 | 1490 | 1595 | 1485 | 965 | 115 | 1210 | 705 | 640 | 1460 | G 1 ½" | G 1 ½" | G ½" |
| 48 | 130 | 1330 | Ø194 | 1710 | 1815 | 1685 | 965 | 115 | 1210 | 705 | 640 | 1460 | G 1 ½" | G 1 ½" | G ½" |
| 69 | 280 | 1170 | Ø245 | 1540 | 1645 | 1640 | 1130 | 115 | 1375 | 785 | 640 | 1465 | G 1 ½" | G 1 ½" | G ½" |
* In case of using regulation feet, the dimension increases from min. 38 to max. 50 mm.
Name of boiler | Defro Sigma E | |||||||
| Specification / boiler type | Unit | 12 | 16 | 20 | 24 | 36 | 48 | 69 |
| Nominal Power | kW | 12 | 16 | 20 | 24 | 36 | 48 | 69 |
| Power range | kW | 3,6-12 | 4,8-16 | 6,0-20 | 7,2-24 | 10,8-36 | 14,4-48 | 17,9-69 |
Boiler class according to PN-EN 303-5 | - | exhaust emission / efficiency - class 5 | ||||||
ECODESIGN | - | Yes | ||||||
Energy efficiency class | - | A+ | ||||||
| Exhaust temperature for nominal power | [ºC] | 105 | 89 | 95 | 113 | 124 | 127 | 141 |
Basic fuel | - | eco-pea coal 5-25 mm | ||||||
Heating area | m2 | 1,9 | 2,3 | 2,7 | 3,1 | 4,3 | 5,2 | 6,5 |
Area of heated rooms 1 | m2 | do 220 | do 260 | do 290 | do 350 | do 450 | do 600 | do 825 |
Capacity of fuel container 2 | kg | ~165 | ~165 | ~165 | ~165 | ~191 | ~266 | ~258 |
Consumption fuel 3 | kg/h | 1,8 | 2,2 | 2,9 | 3,5 | 5,2 | 7,1 | 9,7 |
Constantly combustible | h | ~92 | ~75 | ~57 | ~47 | ~37 | ~37 | ~27 |
Optimal thermal efficiency | % | 90,2 | 90,7 | 90,3 | 90,4 | 90,1 | 90,9 | 90,0 |
Max. permissible operating pressure | bar | opened system 1,5 /locked system 2,5 | opened system 1,5 | |||||
Return water temperature min. | ºC | 55 | ||||||
Temperature control range | ºC | 45 - 80 | ||||||
Required exhaust gas sequence | Pa | 22 | 24 | 26 | 28 | 31 | 34 | 34 |
Supply water temperature min/max. | °C | 65/80 | ||||||
Boiler weight 4 | kg | 400 | 449 | 515 | 523 | 657 | 728 | 880 |
Boiler water capacity | l | 88 | 104 | 110 | 124 | 170 | 200 | 230 |
Chimney stack section | cmxcm | 14x14 | 14x14 | 16x16 | 16x16 | 18x18 | 22x22 | 24x24 |
Chimney stack section | Ø mm | 160 | 160 | 180 | 180 | 200 | 250 | 270 |
Minimum chimney stack height | m | 5 | 6 | 7 | 7,5 | 9 | 10 | 10 |
Width | mm | 1360 | 1360 | 1380 | 1380 | 1460 | 1460 | 1465 |
Depth | mm | 1065 | 1065 | 1110 | 1110 | 1210 | 1210 | 1375 |
| Height 5 | mm | 1405 | 1405 | 1405 | 1535 | 1595 | 1685 | 1645 |
Diameter of supply and return connections | mm | 1½’’ | ||||||
Spigot diameter trigger | ½’’ | |||||||
Power supply | V/Hz | ~230/50 | ||||||
Maximum permissible ambient temperature | ºC | 50 | ||||||
flue diameter | mm | 159 | 159 | 178 | 178 | 178 | 194 | 245 |
Working pressure of coil min./max. 6 | bar | 2/6 | - | |||||
1 Maximum area of heated rooms estimated for unit heat demand q=80 W/m2.
2 Fuel tank capacity for bulk density of eco-pea coal equal to 0,8 kg/dm3.
3 Boiler weight depends on its additional equipment.
| Power [ kW ] | 36 |
| Power [ kW ] | 48 |
| Power [ kW ] | 36 |
| Power [ kW ] | 48 |
| Power [ kW ] | 36 |
| Power [ kW ] | 48 |
| Power [ kW ] | 36 |
| Power [ kW ] | 48 |
| Power [ kW ] | 69 |
| Power [ kW ] | 69 |
| Power [ kW ] | 69 |
| Power [ kW ] | 69 |
| EcoDesign | YES |
| EcoDesign | YES |
| EcoDesign | YES |
| EcoDesign | NO |
| EcoDesign | YES |
| EcoDesign | NO |
| EcoDesign | YES |
| EcoDesign | NO |
| EcoDesign | YES |
| EcoDesign | YES |
| EcoDesign | YES |
| EcoDesign | YES |
| Weight [ kg ] | 657 |
| Weight [ kg ] | 728 |
| Weight [ kg ] | 657 |
| Weight [ kg ] | 728 |
| Weight [ kg ] | 657 |
| Weight [ kg ] | 728 |
| Weight [ kg ] | 657 |
| Weight [ kg ] | 728 |
| Weight [ kg ] | 880 |
| Weight [ kg ] | 880 |
| Weight [ kg ] | 880 |
| Weight [ kg ] | 880 |
| Height [ mm ] | 1,595 |
| Height [ mm ] | 1,685 |
| Height [ mm ] | 1,595 |
| Height [ mm ] | 1,685 |
| Height [ mm ] | 1,595 |
| Height [ mm ] | 1,685 |
| Height [ mm ] | 1,595 |
| Height [ mm ] | 1,685 |
| Width [ mm ] | 1,460 |
| Width [ mm ] | 1,460 |
| Width [ mm ] | 1,460 |
| Width [ mm ] | 1,460 |
| Width [ mm ] | 1,460 |
| Width [ mm ] | 1,460 |
| Width [ mm ] | 1,460 |
| Width [ mm ] | 1,460 |
| Depth [ mm ] | 1,210 |
| Depth [ mm ] | 1,210 |
| Depth [ mm ] | 1,210 |
| Depth [ mm ] | 1,210 |
| Depth [ mm ] | 1,210 |
| Depth [ mm ] | 1,210 |
| Depth [ mm ] | 1,210 |
| Depth [ mm ] | 1,210 |
| Feeder capacity [ dm³ ] | 191 |
| Feeder capacity [ dm³ ] | 266 |
| Feeder capacity [ dm³ ] | 191 |
| Feeder capacity [ dm³ ] | 266 |
| Feeder capacity [ dm³ ] | 191 |
| Feeder capacity [ dm³ ] | 266 |
| Feeder capacity [ dm³ ] | 191 |
| Feeder capacity [ dm³ ] | 266 |
| Feeder capacity [ dm³ ] | 258 |
| Feeder capacity [ dm³ ] | 258 |
| Feeder capacity [ dm³ ] | 258 |
| Feeder capacity [ dm³ ] | 258 |
| Water capacity [ L ] | 170 |
| Water capacity [ L ] | 200 |
| Water capacity [ L ] | 170 |
| Water capacity [ L ] | 200 |
| Water capacity [ L ] | 170 |
| Water capacity [ L ] | 200 |
| Water capacity [ L ] | 170 |
| Water capacity [ L ] | 200 |
| Water capacity [ L ] | 230 |
| Water capacity [ L ] | 230 |
| Water capacity [ L ] | 230 |
| Water capacity [ L ] | 230 |
| Max. operating pressure [ bar ] | 1.500 |
| Max. operating pressure [ bar ] | 1.500 |
| Max. operating pressure [ bar ] | 1.500 |
| Max. operating pressure [ bar ] | 1.500 |
| Max. operating pressure [ bar ] | 2,5 |
| Max. operating pressure [ bar ] | 2,5 |
| Max. operating pressure [ bar ] | 2,5 |
| Max. operating pressure [ bar ] | 2,5 |
| Max. operating pressure [ bar ] | 1.500 |
| Max. operating pressure [ bar ] | 1.500 |
| Max. operating pressure [ bar ] | 2,5 |
| Max. operating pressure [ bar ] | 2,5 |
| Min. Chimney height [ m ] | 9 |
| Min. Chimney height [ m ] | 10 |
| Min. Chimney height [ m ] | 9 |
| Min. Chimney height [ m ] | 10 |
| Min. Chimney height [ m ] | 9 |
| Min. Chimney height [ m ] | 10 |
| Min. Chimney height [ m ] | 9 |
| Min. Chimney height [ m ] | 10 |
| Min. Chimney height [ m ] | 10 |
| Min. Chimney height [ m ] | 10 |
| Min. Chimney height [ m ] | 10 |
| Min. Chimney height [ m ] | 10 |
| Min chimney draft [ Pa ] | 31 |
| Min chimney draft [ Pa ] | 34 |
| Min chimney draft [ Pa ] | 31 |
| Min chimney draft [ Pa ] | 34 |
| Min chimney draft [ Pa ] | 31 |
| Min chimney draft [ Pa ] | 34 |
| Min chimney draft [ Pa ] | 31 |
| Min chimney draft [ Pa ] | 34 |
| Min chimney draft [ Pa ] | 34 |
| Min chimney draft [ Pa ] | 34 |
| Min chimney draft [ Pa ] | 34 |
| Min chimney draft [ Pa ] | 34 |
| Min. chimney diameter [ mm ] | 200 |
| Min. chimney diameter [ mm ] | 250 |
| Min. chimney diameter [ mm ] | 200 |
| Min. chimney diameter [ mm ] | 250 |
| Min. chimney diameter [ mm ] | 200 |
| Min. chimney diameter [ mm ] | 250 |
| Min. chimney diameter [ mm ] | 200 |
| Min. chimney diameter [ mm ] | 250 |
| Min. chimney diameter [ mm ] | 270 |
| Min. chimney diameter [ mm ] | 270 |
| Min. chimney diameter [ mm ] | 270 |
| Min. chimney diameter [ mm ] | 270 |
| Efficiency [ % ] | 90 |
| Class | 5 |
| Thread diameter [ inch ] | 6⁄4'' |
| Max. working temperature [ °C ] | 90 |
| Feeder | YES |
| Burner | YES |
| Steering | YES |
| Warranty | 5 years for tightness of the heat exchanger |
ℹ️ Viewed reviews are moderated. We do not verify that they come from customers who have purchased the product.
Nejlepší kotel na sigma hrášek. Mám rád hrášek. Eko neko






























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