The OPOP UNI K series is the right choice if you want to use various types of pellets, wood chips and firewood as fuel. The boiler body is made of cast iron – manufactured by one of the leading cast iron boiler manufacturers in the Czech Republic. The boiler can be fired with wood, peat, straw pellets, grain, wood chips, firewood, coal and briquettes. The pellet/wood boiler is convenient and easy to use.
Cast Iron Wood Boilers / OPOP UNI K Series
The OPOP UNI K series is the right choice if you want to use various types of pellets, wood chips and firewood as fuel. The boiler body is made of cast iron – it is manufactured by one of the leading cast iron boiler manufacturers in the Czech Republic. The boiler can be fired with wood, peat, straw pellets, grain, wood chips, firewood, coal and briquettes. The pellet/wood boiler is convenient and easy to use.
The system is controlled using the OPOP heating boiler control panel, which is equipped with the following functions:
- 4 operating modes (normal, night/day, calendar, economy)
- 2 temperature sensors for hot water (domestic water and heating water)
- 2 safety sensors (outlet water temperature and pellet feeder overheat sensor (backfire))
- Connection to room thermostat
- Control of pellet feed quantity
- Pellet feeder operation with intervals
- Adjustment of air supply volume
- Ability to regulate heating and domestic hot water temperature
The boiler has high fire safety. The boiler system is hermetically sealed, which eliminates any possibility of air entering the pellet tank or feeder. For additional protection, a special thermovalve has been installed which, in the event of high temperature, supplies water from a separate tank to extinguish the flame in the screw/pellet feeder.
Advantages of the UNI K Series
- Durable cast iron heat exchanger
- Long service life
- Environmentally friendly – Emission class 3 for firewood and emission class 4 for wood chip pellets
- High efficiency
- Convenient to use and maintain
- Automatic boiler operation without pellet refilling for up to 7 days
- Automatic burner cleaning function
- Ability to connect to a room thermostat
- Burner can be positioned on the right or left side of the boiler
- Can be used in gravity and forced circulation systems
Technical parameters:
- Output 6–35 kW
- Motor output: 90 W
- Fan output: 75 W
| Model | UNI K 4 | UNI K 5 | UNI K 6 | |
|---|---|---|---|---|
| Number of sections | 4 | 5 | 6 | |
| Prices EUR incl. VAT | 2900 | 3100 | 3400 | |
| Fuel in automatic mode | Coal | |||
|---|---|---|---|---|
| Size | mm | 8-25mm | ||
| Emission class | 3 | 3 | 3 | |
| Nominal output | kW | 20 | 27 | 35 |
| Minimum output | kW | 6 | 7 | 9 |
| Fuel consumption at nominal output | kg/h | 3,10 | 4,15 | 5,20 |
| Fuel consumption at minimum output | kg/h | 1,04 | 1,08 | 1.34 |
| Efficiency | % | 81 | 82,9 | 84,8 |
| Flue gas temperature at nominal output | °C | 195,1 | 203,2 | 211,3 |
| Flue gas temperature at minimum output | °C | 145,2 | 153,1 | 160,9 |
| Fuel | Wood pellets | |||
|---|---|---|---|---|
| Size | 6-8mm | |||
| Emission class | 4 | 4 | 4 | |
| Nominal output | kW | 20 | 27 | 35 |
| Minimum output | kW | 6 | 7 | 9 |
| Fuel consumption at nominal output | kg/h | 4,79 | 6,57 | 8,34 |
| Fuel consumption at minimum output | kg/h | 1,56 | 1,98 | 2,40 |
| Efficiency | % | 84,3 | 84,6 | 85 |
| Flue gas temperature at nominal output | °C | 161,1 | 157,8 | 154,5 |
| Flue gas temperature at minimum output | °C | 94,8 | 90,9 | 87 |
| Water volume in boiler | l | 58 | 71 | 82 |
| Tank volume | l | 290 | 290 | 290 |
| Chimney draught | Pa | 20 | 20 | 20 |
| Maximum water pressure | bar | 3 | 3 | 3 |
| Maximum water temperature | °C | 90 | 90 | 90 |
| Minimum water temperature | °C | 60 | 60 | 60 |
| Weight | kg | 400 | 475 | 540 |
| Fuel | Firewood | |||
|---|---|---|---|---|
| Nominal output | kW | 19.5 | 24 | 27 |
| Log length | cm | 31 | 40 | 48 |
| Burn time | h | 2-4h | ||
| Dimensions | ||||
|---|---|---|---|---|
| Weight | kg | 400 | 475 | 540 |
| A Boiler height | mm | 1600 | 1600 | 1600 |
| B Boiler width | mm | 580 | 580 | 580 |
| C Boiler depth | mm | 680 | 780 | 880 |
| D Distance to chimney centre | mm | 1360 | 1360 | 1360 |
| E Return | mm | 69 | 69 | 69 |
| F Flow | mm | 1510 | 1510 | 1510 |
| G Boiler width including tank | mm | 1200 | 1200 | 1200 |
| H Return centre from right edge of boiler | mm | 185 | 185 | 185 |
| J Pellet tank height | mm | 1400 | 1400 | 1400 |
| Pellet tank height with loading hatch open | mm | 1820 | 1820 | 1820 |
| Connection sleeves (flow/return) | DN | G2" | G2" | G2" |
| Connection sleeves (fill/drain) | DN | G1/2" | G1/2" | G1/2" |
| Flue pipe size | mm | 160 | 160 | 160 |
| Supply voltage | V | 230 | 230 | 230 |
| Maximum power consumption (fan + motor) | W170 | 170 | 170 | 170 |