Alutherm C 850


The extra large sectional condensing boiler.

Based on the revolutionary design of the Alutherm B 350-600, we have created an even larger version: Alutherm C 850-1050-

1250. Our innovative manifolds (Tichelmann system) and the condensate tray are built into every casting. This means that there are less

components that increase reliability. The supply and return pipes both run out of the boiler at the rear.

Our patented heat exchanger consists exclusively of a molded front, back and center piece. There can be a capacity of

850, 1020 and 1250 kW are reached.


  • For industrial use (XL)
  • Low hydraulic pressure drop due to parallel flow
  • High modulation range
  • Low air resistance and flue gas side resistance
  • Best value for money
  • Fully water-cooled combustion chamber
  • Global patented design
  • Manifolds (Tichelmann system) and condensate tray built into the castings => long life
  • Very high power per m2


Nominal power 850 kW
Return tax 30% 108,3%
Length 2101 mm
Width 878 mm
Height 1655 mm
Weight: 625 kg
NOx (n=1) Class 6
Water pressure 6 Bar
Maximum flow temperature 90°C
Ø Flue gas connection 250 mm
Sound level according to EN813/2013 art.4 -
Easy to clean and maintenance-friendly thanks to the combustion chamber door mechanism
High efficiency up to 108,3%
Small footprint 1,84 m2 for 850 kW