Stropuva S20U – 20 kw

Stropuva S20U Stropuva s20u Katilas kurenamas malkomis, anglimis, pjuvenų, durpių briketais, medienos atliekomis, granulėmis. Stropuva s20u katilas yra unikalus ne tik tinkamo kuro kiekiu, bet pasižymi ekonomiškumu, ilgaamžiškumu. Visi įmonėje pagaminti katilai yra įvertinti CE sertifikatais, nes atitinka Europos Sajungos standartus. Katilas Stropuva s20u neužims daug vieto katilinėje, todėl jį galėsite pastatyti, net ten, kur nėra labai daug vietos.

When the firewood is loaded, a single load burns up to about 30 hours.
A single load of sawdust briquettes burns up to 4 days.

Solid fuel: firewood, timber waste, sawdust, straw, peat briquettes and coal.

Combustion duration of solid fuel load depends on its quality of fuel, outdoor and indoor temperature, thermal resistance, and other factors.
Recommended moisture ≤30%*



  • 1. air damper
  • 2. bi-thermal draught regulator
  • 3. supporting stick
  • 4. air heating chamber
  • 5. smoke extraction flue
  • 6. Switch damper (U – in universal boilers)
  • 7. Telescopic air injection pipe
  • 8. solid fuel loading doors
  • 9. air distributor with a combustion chamber stabilizer
  • 10. solid fuel
  • 11. ash removal doors
  • 12. lifting rope with a ring
  • 13. hook
  • 14. Flow pipe
  • 15. return pipe
  • 16. thermometer tip
  • 17. 1,5 bars pressure safety valve tip
  • 18. Bottom
  • 19. grate (U – in universal and biomass boilers)



This switch damper opens an additional air channel at the bottom of the boiler under the grate. Burning coals or peat briquettes switch damper must be in a position like in the picture.

Technical specifications

Model S20 U
Power (kW)* 20
Heating area(m²)** 100-250
Fuel capacity (dm³) 230
Maximum amount of firewood (kg) 50
Maximum amount of wood pellets (kg) 130
Maximum amount of coals(kg) 130
Wood burning time on minimum mode (hours) 31.5
On maximum mode *** 6.1
Wood pellets burning time on minimum mode (hours) 72
On maximum mode ***-
Briquettes burning time on minimum mode(hours) 96
On maximum mode *** 24
Coal burning time on minimum mode (hours) 130
On maximum mode *** 32
Length of firewood up to (cm) 45
Amount of water in the boiler (l) 40
Efficiency (%) 86.8
Pressure safety valve (bar) 1.5
Chimney draught (Pa) 10-20
Flow of heated water (l/h) 500
Water temperature in the boiler (°C) 85
Minimal area of chimney flue (cm²) 250
Chimney diameter (mm) 180
Distance between boiler bottom and chimney (mm) 1673,5
Height (mm) 2100
Diameter (mm) 560
Weight (kg) 243

*Power depends on the quality of the solid fuel, heating need of the house and the chimney draught.

** The boiler output is chosen according to a heated area. E.g., solid fuel is burning the whole day (20-24 hours) in the solid fuel boiler Stropuva S20 in the 200 m² building whereas  the firewood is burning almost 2 days (35-40 hours) in the solid fuel boiler Stropuva S40 in the house of the same area. A solid fuel boiler Stropuva S10 also can be used but the building will warms up slowly and the boiler would have to be loaded 2-3 times a day.

*** Combustion duration depends on the quality of fuel, outdoor and indoor temperature, thermal resistance, the power of boiler, and the way recommendations of user guide are complied (boiler installation, heated water stream, water temperature maintenance).