Solid Fuel Boilers
TK Solid Fuel Boiler
20 kW
28 kW
35 kW
45 kW
Made from quality steel sheet, the TK boiler is designed for heating residential and smaller commercial spaces. The only boiler with a tubular heat exchanger on the market.
5+1
Years of Warranty
3
types of fuel
91%
Efficiency
Listening to market needs, ThermoFLUX introduced the TK — the only boiler with a tubular heat exchanger on the market, making it truly unique. The combination of the heat exchanger and cast iron grates at the base of the firebox enables ideal fuel combustion. The massive cast iron grates retain their shape even at the highest temperatures and hold heat for extended periods. The TK boiler is designed for burning all types of solid fuel (wood, coal, briquettes), while being very easy to clean and maintain. Combined with its compact dimensions, it is suitable for most utility rooms.
Product video
Features
Three Fuels, One Boiler
— 01
Cast Iron Grates
Massive cast iron grates form the firebox base and remain undeformed even at the highest temperatures.
— 02
Large Firebox Door
The large door allows very easy fuelling and cleaning of the boiler.
— 03
Tubular Heat Exchanger
The TK boiler features a tubular heat exchanger that increases fuel efficiency and reduces unnecessary heat loss.
— 04
Complete Combustion
The boiler's construction ensures high efficiency and complete fuel combustion.
Advantages
Additional Features
Everything you need to know about the TK boiler and its advantages for your space.
- Quick installation and setup
- Designed for burning wood, coal and briquettes
- Built with a tubular heat exchanger
- Reduces energy consumption
- Cast iron grate in the firebox
- Very easy fuelling and cleaning
Technical details
Detailed overview of specifications for all models
| Unit measures | TK 20 | TK 28 | TK 35 | TK 45 | |
| Heat power range | kW | 15-22 | 23-30 | 33-40 | 40-50 |
| Water capacity | L | 55 | 65 | 85 | 95 |
| Boiler weight | kg | 243 | 281 | 334 | 375 |
| Inlet/Outlet | " | 5/4" | 5/4" | 5/4" | 5/4" |
| Max. working temperature | °C | 85 | 85 | 85 | 85 |
| Max. working vacuum | bar | 3 | 3 | 3 | 3 |
| Height to the middle of the chimney | mm | 1000 | 1000 | 1000 | 1000 |
| Boiler depth | mm | 795 | 795 | 940 | 1070 |
| Boiler width | mm | 415 | 515 | 515 | 515 |
| Boiler height | mm | 1255 | 1255 | 1255 | 1255 |
| Chimney diameter | mm | 160 | 160 | 160 | 180 |
| Inlet/Outlet height | mm | 1285/405 | 1285/405 | 1285/405 | 1285/405 |
| Min./max. outlet water temperature | °C | 55/85 | 55/85 | 55/85 | 55/85 |
| Cargo door opening (h x w) | mm | 250x240 | 250x340 | 250x340 | 250x340 |
| Max. log length | mm | 410 | 410 | 550 | 680 |
| Fuel | - | wood, coal | wood, coal | wood, coal | wood, coal |
| Flue pipe direction | - | back | back | back | back |
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