High‑power condensing boiler VKK 806/3‑E ecoCRAFT 0010016460

High‑power condensing boiler designed for demanding installations

The VKK 806/3‑E ecoCRAFT boiler runs on natural gas and uses condensing technology to recover additional energy from water vapor in the exhaust gases – this enables an efficiency of 108 % at 50–30 °C, resulting in significant fuel savings compared with conventional boilers. No energy is lost in the flue – it is converted into heat.

Dimensions: 695 × 1285 × 1240 mm, weight approx. 200–210 kg – compact yet not too small. It can be carried through standard doors without enlarging openings, simplifying installation even in existing buildings. Designed for surface‑mounting and operates as a single‑pass boiler – ideal for heating systems with or without an external boiler.

For the installer: flexibility and reliability

• Modulation from 13.6 kW to 82.4 kW – smooth operation from low output, eliminating frequent start/stop cycles and reducing gas consumption.

• Sectional aluminium‑silicon heat exchanger – corrosion‑resistant, highly effective under condensing conditions, easy to service.

• eBus and ProE – compatible with Vaillant controllers (VRC 630, VRC 700/4), allowing control of up to 8 boilers in cascade – perfect for large buildings.

• Display showing temperature and pressure information – quick diagnostics during service.

• Emergency mode – with minor adjustments continues operating at 75 % power, avoiding a complete shutdown.

• Exhaust pipe length up to 50 m – provides flexibility when designing the flue system.

For the user: heat without unnecessary costs

• Fuel savings up to 25 % per year thanks to condensation – lower bills without changing habits.

• Domestic hot‑water temperature range 35 °C to 85 °C – suitable for modern low‑temperature floor heating as well as traditional radiators.

• NOx emission class 5 – the lowest level of harmful emissions, meeting the strictest environmental standards.

• No need for anti‑frost additives – the device is not damaged by chemical additives.

• Closed combustion chamber – safe operation even in rooms with limited ventilation.

No additional circulation pump or expansion tank is required – the boiler is ready to connect. It is prepared for use with accumulator systems and can be controlled by smart regulators. This is not just a boiler – it is the heart of a comprehensive heating system for multi‑storey buildings, schools, or production halls.