Manual fired boiler for coal DEFRO Optima Komfort Eko 28
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£2,454.89
The promotion runs until 24 July 2026
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Description
The boiler DEFRO Optima Komfort Eko is a hopper-fed boiler for hard coal. It has a body made of certified boiler steel sheet. Cooperation with an accumulation tank is required.
Primary air is supplied gravitationally from outside by means of a tilting flap located in the firebox and ash pan doors, controlled by means of a draft gauge.
The boiler is adapted for installation in a closed system provided that safety devices are installed in accordance with the boiler DTR and has the possibility of regulating the supply of secondary air.
The boilers meet the energy and emission requirements of class 5 and have an Ecodesign Certificate.
Advantages:
- High thermal efficiency in the range of 90.0 to 90.9% thanks to increased heat recovery from flue gases;
- Boiler adapted as standard for installation in a closed system provided that safety devices are installed in accordance with the boiler DTR;
- Heat exchanger made of certified high-grade steel;
- Possibility to change the direction of door opening (applies to upper and middle doors);
- Regulation of secondary air supply;
- Large hopper chamber;
- Adapted for installation of a thermostatic draft gauge;
- Mechanical regulation of the combustion process using a knob in the ash pan doors;
- Boiler adapted for installation in a closed system provided that safety devices are installed in accordance with the boiler DTR;
- 3 years warranty for heat exchanger tightness, 2 years for other components and proper boiler operation - provided the installation is in accordance with the boiler DTR;
| Specification/boiler type | Unit | Optima Komfort Eko 22 | Optima Komfort Eko 24 | Optima Komfort Eko 28 | Optima Komfort Eko 35 | Optima Komfort Eko 45 |
| Fuel | [-] | hard coal - nut with granulation 20-50mm | ||||
| Hopper chamber capacity | [kg] | 31 | 33 | 35 | 35 | 45 |
| Efficiency for nominal power | [%] | 89.9 | 90.4 | 90.7 | 90.0 | 89.7 |
| Energy efficiency class | [-] | B | ||||
| Max. permissible working pressure | [bar] | 1.5 | ||||
| Required flue gas draft | [mbar] | 0.24 | 0.30 | 0.30 | 0.32 | 0.31 |
| Water temperature on supply max. | [°C] | 65/90 | ||||
| Boiler weight | [kg] | 355 | 395 | 430 | 465 | 515 |
| Water capacity of the boiler | [l] | 81 | 96 | 107 | 119 | 132 |
| Diameter of supply and return | [in] | G 1½” | ||||
| Diameter of flue gas outlet socket | [mm] | Ø 178 | Ø 194 | Ø 245 | ||
| Min. safe capacity of accumulation tank | [l] | 1200 | 1300 | 1500 | 1800 | 2600 |
Dimensions:
Technical data
| Boiler class (303-5:2012) | 5 |
| Power output | 28 kW |
| Exhaust gas pipe diameter | 194 mm |
| Weight | 430 kg |
| Efficiency | 90.7 % |
| Ecodesign | + |
| Height | 1445 mm |
| Width | 582 mm |
| Depth | 943 mm |
| Outlet and inlet size | 1 ½ G |
| Producer's recommended minimum volume of accumulation tanks | 1500 L |
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