FIREWOOD AND PELLET BOILER

NEW! S5 Dual

22 – 48 kW

V-combustion chamber
made of silicon carbide
Innovative Lambdatronic
5000 boiler controller

Firewood and pellet boiler

NEW! S5 Dual

Two systems perfectly combined

The S5 Dual firewood and pellet boiler combines two perfect systems – it meets all the requirements for firewood and pellet fuels in two separate combustion chambers. Highly efficient and convenient – the S5 Dual boasts low emissions and energy costs.


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, long refilling intervals and low power consumption make the S5 Dual a solution that is as economical as it is convenient. The S5 Dual also offers important advantages when installed in the boiler room: The compact design means that installation is child’s play, even when space is limited.

Pellet unit can be retrofitted at any time

Froling offers a flexible solution for people who may want to use pellets in future: the S5 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

Regelung Lambdatronic 5000

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

Integrierter Partikelabscheider

Integrated particle separator (electrostatic precipitator) available as an option

Großer Füllraum für Halbmeter-Scheite

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

Siliziumkarbid-Brennkammer

Optimised V-combustion chamber made of silicon carbide for even better efficiency and lower emissions

Wassergekühlter Pelletsflansch

Water-cooled pellet flange in the fuel loading chamber of the firewood boiler

Praktische Komfort-Aschebox

Practical, convenient ash box for simple, dust-free emptying and long emptying intervals

Unterdrucksensor

Under-pressure sensor

Abgasrezirkulation AGR (serienmäßig integriert)

Flue gas recirculation FGR (integrated as standard)

Automatische Zündung und vollautomatische Betriebsfortführung

Automatic ignition and fully automatic
continued operation

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 Labels

NEW! S5 Dual

Tecnical specifications

Tecnical data - S5 Dual2230344048
Nominal heat output - firewood operation / pellet operation[kW]22 / 2230 / 3034 / 3440 / 4048 / 40
Output range - pellet mode[kW]6,6 – 229 - 3010,2 - 3412 - 4012 - 40
Energy label (Efficiency label (boiler + controller))_A+A+A+A+A+
Weight - firewood boiler / pellet unit[kg]635 / 200640 / 200765 / 200770 / 200775 / 200
Water capacity - firewood boiler / pellet unit[l]115 / 19115 / 19175 / 19175 / 19175 / 19
Fuel loading chamber capacity[l]145145200200200
Pellet container capacity[l]9595959595
NEW! S5 Dual

Dimensions

Dimensions in mm - S5 Dual2230344048
L1     Length of the boiler (flue gas pipe connection at rear)13051305133513351335
L2    Distance from the flue gas pipe top connection to the front face of
the boiler11851185121512151215
L3    Length, pellet unit10401040104010401040
L4    Length, firewood boiler11801180121012101210
B1    Total width including WOS lever10401040114011401140
B2   Width, firewood boiler600600700700700
B3   Width, pellet unit370370370370370
B4   Width, boiler970970107010701070
B5   Distance between flue gas pipe connection and side of boiler410410510510510
B6   Distance between flow connection and side of boiler9090145145145
B7    Distance between safety heat exchanger connections6060757575
B8   Distance between safety heat exchanger connection and side of boiler6565125125125
B9   Clearance from drainage connection to side of boiler3030350350350
B10 Clearance from return connection to side of boiler670670770770770
H1   Height of boilerl16001600165016501650
H2   Height, connection for rear flue gas pipe14051405145514551455
H3   Height of the flue gas pipe top connection15201520157015701570
H4   Height, pellet unit14451445144514451445
H5  Height, hose line connections940940990990990
H6  Height, return connection170170170170170
H7   Height, drainage connection125125125125125
H8  Height, safety heat exchanger connection13451345139513951395
H8  Height of connection for flow940940990990990
Flue gas pipe diameter129129149149149
NEW! S5 Dual

Operating and maintenance areas

Recommended clearances in mm - S5 Dual2230344048
A     Insulated door to the wall800800800800800
A1    Door swing area550550650650650
B      Boiler side with WOS lever to wall300¹300¹300¹30013001
B1    Firewood boiler to the wall670670670670670
C     Back side to the wall400400400400400
D     Side of boiler to the wall150150150150150
E      Maintenance area above the boiler500250025002500²500²

¹ The right maintenance area can be reduced to 100 mm in exceptional circumstances, provided access to the rear of the boiler is guaranteed. In this case, the boiler can only be serviced from the rear. The maintenance area at the rear (C) is increased to 500 mm.

² Maintenance area for removing the WOS springs upwards

Tecnical documents

Bedienungsanleitung Scheitholzkessel S5 Turbo 22-48 (ESP) mit Lambdatronic 5000
29. August 2025 B1980025 [DE]
Operating instructions Firewood boiler S5 Turbo 22-48 (ESP) with Lambdatronic 5000
7. January 2026 B1980025 [EN]
Manual de instrucciones Caldera de leña S5 Turbo 22-48 (ESP) con Lambdatronic 5000
7. January 2026 B1980025 [ES]
Mode d’emploi Chaudières à bûches S5 Turbo 22-48 (ESP) avec Lambdatronic 5000
7. January 2026 B1980025 [FR]
Manuale di istruzioni Caldaia a legna S5 Turbo 22-48 (ESP) con Lambdatronic 5000
7. January 2026 B1980025 [IT]
Bruksanvisning Vedpanna S5 Turbo 22-48 (ESP) med Lambdatronic 5000
7. January 2026 B1980025 [SV]
Bedienungsanleitung Kombikessel S5 Dual (ESP)
13. January 2026 B1970125 [DE]
Operating instructions Dual fuel boiler S5 Dual (ESP)
17. February 2026 B1970125 [EN]
Manual de instrucciones Caldera de lena y pélets S5 Dual (ESP)
17. February 2026 B1970125 [ES]
Mode d’emploi Chaudière mixte S5 Dual (ESP)
17. February 2026 B1970125 [FR]
Manuale di istruzioni Caldaia combinata S5 Dual (ESP)
17. February 2026 B1970125 [IT]
Bruksanvisning Kombinationspanna S5 Dual (ESP)
17. February 2026 B1970125 [SV]
Klemmenplan S5 Turbo 22-48 / S5 Dual 22-48
23. April 2025 M2910125 [DE]
Montageanleitung Kombikessel S5 Dual 22-48 (ESP)
10. December 2025 M2940125 [DE]
Installation instructions Dual fuel boiler S5 Dual 22-48 (ESP)
17. February 2026 M2940125 [EN]
Manual de instalación Caldera de lena y pélets S5 Dual 22-48 (ESP)
17. February 2026 M2940125 [ES]
Instructions de montage Chaudière mixte S5 Dual 22-48 (ESP)
17. February 2026 M2940125 [FR]
Manuale di installazione Caldaia combinata S5 Dual 22-48 (ESP)
17. February 2026 M2940125 [IT]
Monteringsanvisning Kombinationspanna S5 Dual 22-48 (ESP)
17. February 2026 M2940125 [SV]
Montageanleitung Pelletseinheit für S5 Dual (ESP) Anleitung zur Nachrüstung bei bestehendem Scheitholzkessel S5 Turbo (ESP)
10. December 2025 M2980125 [DE]
Installation instructions Pellet unit for SP Dual (ESP) Instructions for retrofitting existing firewood boiler S5 Turbo (ESP)
17. February 2026 M2980125 [EN]
Manual de instalación Unidad de pellets para la SP Dual (ESP) Instrucciones para modernizar la caldera de leña existente S5 Turbo (ESP)
17. February 2026 M2980125 [ES]
Instructions de montage Unité à granulés pour SP Dual (ESP) Instructions pour moderniser la chaudière à bois existante S5 Turbo (ESP)
17. February 2026 M2980125 [FR]
Monteringsanvisning Pelletsenhet för SP Dual (ESP) Instruktioner för eftermontering av befintlig vedpanna S5 Turbo (ESP)
17. February 2026 M2980125 [SV]
Manuale di installazione Unità pellet per SP Dual (ESP) Istruzioni per l'adeguamento della caldaia a legna esistente S5 Turbo (ESP)
17. February 2026 M2980125 [IT]

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