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KALVIS K-2-20 N 20kW solid fuel boiler
KALVIS K-2-20 N is a multipurpose lower-combustion solid-fuel central-heating boiler with a nominal output of 20 kW. It is designed for heating residential and other buildings using wood logs and other solid fuels permitted by the manufacturer.
The boiler features a large 136-litre fuel chamber. Fuel can be loaded either from the front or from the top. Maximum wood-log length is 40 cm, while one fuel load can burn for up to 10–14 hours, depending on fuel type, moisture content, outdoor temperature and other operating conditions.
Efficiency when firing wood logs is 82%. Boiler temperature is regulated automatically. The construction incorporates secondary-air supply and a secondary combustion chamber with a refractory-concrete catalyst to support efficient combustion.
The boiler includes smoke-exhaust, ignition and draught dampers, a fire-grate shaking mechanism, emergency cooling coil and a heat exchanger that can be cleaned from both sides. Provision is also made for installing a smoke exhauster and pellet burner.
The inner-wall steel thickness is 6 mm, and KALVIS provides a 4-year warranty for the boiler body.
Main advantages
Lower-combustion solid-fuel boiler
Nominal output 20 kW
Efficiency 82%
Large 136 l fuel chamber
Fuel loading from the front or top
Fuel burn time up to 10–14 hours
Maximum log length 40 cm
Automatically regulated boiler temperature
Secondary-air supply
Secondary combustion chamber with refractory-concrete catalyst
Smoke-exhaust, ignition and draught dampers
Fire-grate shaking mechanism
Heat exchanger cleaning from both sides
Emergency cooling coil
Possibility to install a smoke exhauster
Possibility to install a pellet burner
6 mm inner-wall steel thickness
4-year boiler body warranty.
Technical information
| Parameter | Value |
|---|---|
| Manufacturer | KALVIS |
| Model | K-2-20 N |
| Boiler type | Lower-combustion solid-fuel central-heating boiler |
| Nominal output | 20 kW |
| Heated area, B-class buildings | 172–420 m² |
| Heated area, C-class buildings | 92–220 m² |
| Fuel | Wood logs |
| Additional fuels | Wood waste, sawdust briquettes, peat briquettes |
| Efficiency with wood logs | 82 % |
| Fuel chamber volume | 136 l |
| Fuel burn time | 10–14 h |
| Maximum log length | 40 cm |
| Boiler water volume | 72 l |
| Flue diameter | Ø160 mm |
| Minimum chimney draught | 19 Pa |
| Dimensions (H × W × D) | 1350 × 770 × 1210 mm |
| Gross weight | 360 kg ±10 % |
| Inner-wall steel thickness | 6 mm |
| Pellet burner installation | Possible |
| Smoke exhauster installation | Possible |
| Boiler body warranty | 4 years |
1. Room el. heating elements
2. Cooling coil
3. Smoke shut-off valve
4. Start valve
5. Flue and flue damper
6. Installation location of the smoke exhaust
7. Secondary air intake
8. Soot cleaning caps
9. Combustion chamber bricks
10. Ash drawer
11. Grid shaking mechanism
12. Grid
13. Traction control