FIREWOOD BOILER

NEW! S2 Turbo

15 – 20 kW

Integrated particle separator
(electrostatic precipitator)
available as an option

Firewood boiler

NEW! S2 Turbo

The S2 Turbo firewood boiler combines the latest technology with the strengths of tried and tested systems, providing reliable heat at the highest level. The new LTC 5000 control system with 7” glass touch display offers even more options when it comes to controlling the boiler. The swivelling flue pipe connection makes adapting to different types of installation possible, considerably facilitating installation. Optionally, an integrated particle separator ensures even lower emissions and fulfils the highest requirements for environmental friendliness. Proven features such as efficient carbonisation gas extraction, the speed-controlled induced draught fan, high efficiency, long refilling intervals and low power consumption make the S2 Turbo a solution that is as economical as it is practical. Heating with firewood can be so convenient!

Pellet unit can be added any time

Froling offers a flexible solution for people who may want to use pellets in future: the S2 Turbo comes with a pellet flange as standard, which means that the pellet unit can be retrofitted at any time. This is supplied fully insulated and ready to plug in.

Information/advice

You would like to have further product information or you have general questions regarding our company?

The latest technology

Drehbarer Rauchrohranschluss

Flue pipe connection can be rotated to horizontal or vertical orientation

Drehzahlgeregeltes Saugzuggebläse

Speed-regulated induced draught fan

WOS-Technik

Manual/automatic WOS system (efficiency optimisation system) for optimum cleaning of the heat exchanger pipes

Großer Füllraum

Large fuel loading chamber for 50 cm wood blocks (up to 56 cm)

Hochtemperatur-Schamottbrennkammer

High-temperature firebrick-lined combustion chamber (Easy to replace individual bricks)

Hochwertige Isolierung

High-quality insulation for minimal radiant heat loss

Automatische Zündung

Automatic ignition with silent ceramic igniter (optional)

Regelung Lambdatronic 5000

Lambdatronic 5000 controller with 7” glass touch display for even easier operation

Schwelgasabsaugung

Carbonisation gas extraction system prevents smoke escaping during reloading

Spezielle Anheizautomatik

Special automatic pre-heating with regulated air ducts

Große Reinigungstür

Large cleaning port door for easy ash removal and cleaning from the front

Elektrofilter

Integrated particle separator (electrostatic precipitator) available as an option

Individual controller for the heating system

Lambdatronic 5000 controller

With the new Lambdatronic 5000 boiler controller and the modern 7″ glass touch display, Fröling is moving into the future. The new design is impressive, not only for its intuitive operation but also its numerous new features. The most important
components can be freely selected in the tile overview and information and error messages can be customised. For example, the control system will inform you when the ash box needs to be emptied. This makes operating and running the system even simpler and easier to understand. The intelligent control management enables the almost unlimited integration of heating circuits, storage tanks and hot water tanks.

Advantages

  • Precise combustion control by a Lambda controller using a Lambda probe
  • Connection of heating circuits, water heaters and buffer storage tanks Management systems
  • Integration capability for a solar panel system
  • LED frame for status display with illuminated presence detection
  • Simple & intuitive operation
  • Various SmartHome solutions (e.g. Loxone, Modbus TCP) Remote control from the Living room (room console) or via the Internet (froeling-connect.com)

Keep track of everything with the Froling App

The Froling App allows you to check and control your Froling boiler online from
anywhere, at any time. You can read and modify the main status information and settings easily and conveniently online. You can also specify which status messages you want to be informed about via SMS or e-mail (e.g. when the ash box is to be emptied or in the event of a fault message).
The app is available in the Android Play Store and iOS App Store.

Advantages

  • Simple and intuitive operation of the boiler
  • Status information can be called up and changed within seconds
  • Individual naming of the heating circuits
  • Changes of status are notified directly to the user (e.g. via
    e-mail or push notifications)
  • No additional hardware required (such as an Internet gateway)

 

 

Smart Home

Loxone

Combine your Froling heating system with the Loxone Miniserver and the new Froling Extension and implement individual boiler control on the basis of the single room control of the Loxone Smart Home.

Modbus

Via the Froling modbus interface, the system can be integrated
into a building management system.

Brochures / EU Label

NEW! S2 Turbo

Tecnical data

Tecnical data - S2 Turbo1520
Nominal output[kW]15
Energy rating label Efficiency label (boiler + controller)A+A+
Power connection[V/Hz/A]230V / 50Hz / fused C16A
Power consumption[W]41
Weight of boiler incl. insulation and control[kg]490
Dimensions of fuel loading door (width/height)[mm]350 / 360
Fuel loading chamber capacity[l]80
NEW! S2 Turbo

Dimensions

Dimensions in mm - S2 Turbo1520
L1     Length of the boiler (flue gas pipe connection at rear)10701070
L2    Distance from the flue gas pipe top connection to the front face of the boiler915915
L3    Length, boiler10001000
B1    Overall width of boiler incl. WOS lever830830
B2   Width of boiler685685
B3   Distance between flue gas pipe connection and side of boiler270270
B4   Distance between flow connection and side of boiler135135
B5   Distance between safety heat exchanger connection and side of boiler105105
B6   Distance between safety heat exchanger connections6565
B7    Distance between return connection and side of boiler485485
B8   Distance between drainage connection and side of boiler575575
H1   Height of boiler13351335
H2   Height of rear connection for the flue gas pipe12301230
H3   Height of flue gas pipe top connection13851385
H4   Height, safety heat exchanger connection840840
H5  Height, return connection150150
H6  Height, drainage connection125125
H7   Height, flow connection11251125
Flue gas pipe diameter129129
NEW! S2 Turbo

Operating and mainentance areas

Minimum clearances - S2 Turbo [mm]15 / 20
A Clearance from front of boiler to wall800
B Door swing area200
C Clearance from back side to walld400
D Clearance from side of boiler to wall500 (200¹)
E Maintenance area above the boiler²500
Mindestabstände - S2 Dual compact [mm]15 / 20
A Clearance from front of boiler to wall800
B Clearance from boiler side with pellet unit to wall200
B1 Clearance from boiler side without pellet unit to wall815
C Clearance from back side to walld400
D Clearance from side of boiler to wall500 (200¹)
E Maintenance area above the boiler²500

¹ The heat exchanger for the boiler is accessible for maintenance only from the front
² Maintenance area for removing the WOS springs upwards

Tecnical documentation

Bedienungsanleitung Scheitholzkessel S2 Turbo 15-20 (ESP)
6. May 2025 B1920025 [DE]
Operating instructions Firewood boiler S2 Turbo 15-20 (ESP)
7. January 2026 B1920025 [EN]
Manual de instrucciones Caldera de leña S2 Turbo 15-20 (ESP)
7. January 2026 B1920025 [ES]
Mode d’emploi Chaudières à bûches S2 Turbo 15-20 (ESP)
7. January 2026 B1920025 [FR]
Manuale di istruzioni Caldaia a legna S2 Turbo 15-20 (ESP)
7. January 2026 B1920025 [IT]
Bruksanvisning Vedpanna S2 Turbo 15-20 (ESP)
7. January 2026 B1920025 [SV]
Klemmenplan S2 Turbo 15-20 / S2 Dual compact 15-20
23. April 2025 M2900225 [DE]
Montageanleitung Scheitholzkessel S2 Turbo 15-20 (ESP)
17. November 2025 M2770125 [DE]
Installation instructions Firewood boiler S2 Turbo 15-20 (ESP)
7. January 2026 M2770125 [EN]
Manual de instalación Caldera de leña S2 Turbo 15-20 (ESP)
7. January 2026 M2770125 [ES]
Instructions de montage Chaudières à bûches S2 Turbo 15-20 (ESP)
7. January 2026 M2770125 [FR]
Manuale di installazione Caldaia a legna S2 Turbo 15-20 (ESP)
7. January 2026 M2770125 [IT]
Monteringsanvisning Vedpanna S2 Turbo 15-20 (ESP)
7. January 2026 M2770125 [SV]

For you personally

Information & advice

You would like to have further product information or you have general questions regarding our company?

Contact

Fröling Heizkessel- und Behälterbau Ges.m.b.H.
Industriestraße 12 | A – 4710 Grieskirchen

Company

Froling is a pioneer in modern wood heating systems. The Froling signature is on many products from the groundbreaking invention of the firewood boiler with high-temperature combustion, from the wood chip burner with Lambda technology to the development of the internationally acclaimed pellet boiler.

A wide variety of well-known international quality awards underscores the ongoing success of the Austrian family company.

Heating with biomass

Heating with wood is convenient, saves on heating costs, is a secure renewable raw material and is also carbon-neutral