OPOP UNI cast iron boilers are designed for heating private homes, small apartment buildings, offices and shops. Any solid fuel can be used in cast iron boilers – wood, wood briquettes, coal. Cast iron boilers are available in various outputs from 13–53 kW. These boilers can heat spaces of 70–500 m².
OPOP cast iron central heating boilers can be used in both gravity heating systems and forced water circulation systems. In a closed heating system, the boiler must always be used together with a pressure safety valve to prevent overheating and system damage. The 3-pass flue gas path ensures a high boiler efficiency coefficient with low emissions.
Cast iron wood heating boilers are the most popular type of solid fuel boiler. Not long ago (during the Soviet era), Lithuanian-made cast iron boilers were very popular, but such boilers are now rarely seen in use. Today it is economically justified to replace an inefficient old cast iron boiler with a new generation cast iron boiler. The fuel savings will be very significant.
Advantages of the OPOP UNI boiler series:
- Long service life
- 5-year warranty on the body
- 3-pass flue gas path
- Large combustion chamber capacity
- Easy firing, operation and cleaning
- Reliable operation
- Modern design
- Boiler supplied with pressure gauge and thermometer
- Boiler supplied with air supply regulator based on boiler temperature
Cast iron boiler technical parameters and prices:
| Model |
UNI 3 |
UNI 4 |
UNI 5 |
UNI 6 |
UNI 7 |
UNI 8 |
| Number of cast iron sections |
3 |
4 |
5 |
6 |
7 |
8 |
| PRICE, EUR incl. VAT |
620 |
670 |
750 |
835 |
910 |
995 |
| Fuel type: Coal, wood briquettes, firewood |
| Output |
kW |
13 – 16.5 |
19.5 – 20 |
24 – 28 |
27 – 35 |
30.5 – 44 |
33.8 – 53 |
| Weight |
kg |
190 |
235 |
280 |
325 |
370 |
415 |
| Water volume in boiler |
l |
22 |
28 |
34 |
40 |
46 |
52 |
| Combustion chamber volume |
dm3 |
33.0 |
51.6 |
70.3 |
89.1 |
107.8 |
126.5 |
| Maximum fuel diameter |
mm |
280 |
| Recommended heating water temperature |
°C |
60-90 |
| Minimum inlet temperature to boiler |
°C |
60 (recommended) |
| Safety system activation |
°C |
95 |
| Maximum working pressure |
bar |
3 |
| Flue outlet diameter |
mm |
160 |
| Water connection diameter |
l |
2″ |
| Height |
mm |
1 070 |
| Width |
mm |
520 |
| Length |
mm |
432 |
537 |
642 |
747 |
852 |
957 |
| Fuel type: Firewood |
| Output |
kW |
13 |
19.5 |
24 |
27 |
30.5 |
33.8 |
| Efficiency |
% |
62-67.5 |
| Burn duration |
h |
2 – 4 |
| Average flue gas temperature |
°C |
220 – 300 |
| Required chimney draught |
mbar |
0.15-0.2 |
0.15-0.22 |
0.15-0.25 |
0.15-0.26 |
0.15-0.27 |
0.15-0.28 |
| Fuel type: Coal, wood briquettes |
| Output |
kW |
16.5 |
20 |
28 |
35 |
44 |
53 |
| Efficiency |
% |
70.6 – 76.6 |
| Burn duration |
h |
4 up to 6 |
| Average flue gas temperature |
°C |
220 – 320 |
| Required chimney draught |
mbar |
0.15-0.2 |
0.15-0.22 |
0.15-0.25 |
0.15-0.26 |
0.15-0.27 |
0.15-0.28 |
