FIREWOOD AND PELLET BOILER
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.
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

Lambdatronic 5000 controller with 7" glass touch display for even easier operation
Integrated particle separator (electrostatic precipitator) available as an option
Large fuel loading chamber for halfmetre wood blocks (up to 56 cm)
Optimised V-combustion chamber made of silicon carbide for even better efficiency and lower emissions
Water-cooled pellet flange in the fuel loading chamber of the firewood boiler
Practical, convenient ash box for simple, dust-free emptying and long emptying intervals
Under-pressure sensor
Flue gas recirculation FGR (integrated as standard)
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
Tecnical specifications
| Tecnical data - S5 Dual | 22 | 30 | 34 | 40 | 48 | |
|---|---|---|---|---|---|---|
| Nominal heat output - firewood operation / pellet operation | [kW] | 22 / 22 | 30 / 30 | 34 / 34 | 40 / 40 | 48 / 40 |
| Output range - pellet mode | [kW] | 6,6 – 22 | 9 - 30 | 10,2 - 34 | 12 - 40 | 12 - 40 |
| Energy label (Efficiency label (boiler + controller)) | _ | A+ | A+ | A+ | A+ | A+ |
| Weight - firewood boiler / pellet unit | [kg] | 635 / 200 | 640 / 200 | 765 / 200 | 770 / 200 | 775 / 200 |
| Water capacity - firewood boiler / pellet unit | [l] | 115 / 19 | 115 / 19 | 175 / 19 | 175 / 19 | 175 / 19 |
| Fuel loading chamber capacity | [l] | 145 | 145 | 200 | 200 | 200 |
| Pellet container capacity | [l] | 95 | 95 | 95 | 95 | 95 |
Dimensions

| Dimensions in mm - S5 Dual | 22 | 30 | 34 | 40 | 48 |
|---|---|---|---|---|---|
| L1 Length of the boiler (flue gas pipe connection at rear) | 1305 | 1305 | 1335 | 1335 | 1335 |
| L2 Distance from the flue gas pipe top connection to the front face of | |||||
| the boiler | 1185 | 1185 | 1215 | 1215 | 1215 |
| L3 Length, pellet unit | 1040 | 1040 | 1040 | 1040 | 1040 |
| L4 Length, firewood boiler | 1180 | 1180 | 1210 | 1210 | 1210 |
| B1 Total width including WOS lever | 1040 | 1040 | 1140 | 1140 | 1140 |
| B2 Width, firewood boiler | 600 | 600 | 700 | 700 | 700 |
| B3 Width, pellet unit | 370 | 370 | 370 | 370 | 370 |
| B4 Width, boiler | 970 | 970 | 1070 | 1070 | 1070 |
| B5 Distance between flue gas pipe connection and side of boiler | 410 | 410 | 510 | 510 | 510 |
| B6 Distance between flow connection and side of boiler | 90 | 90 | 145 | 145 | 145 |
| B7 Distance between safety heat exchanger connections | 60 | 60 | 75 | 75 | 75 |
| B8 Distance between safety heat exchanger connection and side of boiler | 65 | 65 | 125 | 125 | 125 |
| B9 Clearance from drainage connection to side of boiler | 30 | 30 | 350 | 350 | 350 |
| B10 Clearance from return connection to side of boiler | 670 | 670 | 770 | 770 | 770 |
| H1 Height of boilerl | 1600 | 1600 | 1650 | 1650 | 1650 |
| H2 Height, connection for rear flue gas pipe | 1405 | 1405 | 1455 | 1455 | 1455 |
| H3 Height of the flue gas pipe top connection | 1520 | 1520 | 1570 | 1570 | 1570 |
| H4 Height, pellet unit | 1445 | 1445 | 1445 | 1445 | 1445 |
| H5 Height, hose line connections | 940 | 940 | 990 | 990 | 990 |
| H6 Height, return connection | 170 | 170 | 170 | 170 | 170 |
| H7 Height, drainage connection | 125 | 125 | 125 | 125 | 125 |
| H8 Height, safety heat exchanger connection | 1345 | 1345 | 1395 | 1395 | 1395 |
| H8 Height of connection for flow | 940 | 940 | 990 | 990 | 990 |
| Flue gas pipe diameter | 129 | 129 | 149 | 149 | 149 |
Operating and maintenance areas

| Recommended clearances in mm - S5 Dual | 22 | 30 | 34 | 40 | 48 |
|---|---|---|---|---|---|
| A Insulated door to the wall | 800 | 800 | 800 | 800 | 800 |
| A1 Door swing area | 550 | 550 | 650 | 650 | 650 |
| B Boiler side with WOS lever to wall | 300¹ | 300¹ | 300¹ | 3001 | 3001 |
| B1 Firewood boiler to the wall | 670 | 670 | 670 | 670 | 670 |
| C Back side to the wall | 400 | 400 | 400 | 400 | 400 |
| D Side of boiler to the wall | 150 | 150 | 150 | 150 | 150 |
| E Maintenance area above the boiler | 5002 | 5002 | 5002 | 500² | 500² |
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
For you personally
Information & advice
You would like to have further product information or you have general questions regarding our company?
