Learn more about Viessmann’s Lambda Pro Plus automatic combustion control, as found as standard across the Vitodens 200 boiler range. Lambda Pro Plus achieves exceptional boiler energy efficiency and reliability, as well as clean operation, even with fluctuating gas quality, thanks to its ability to detect and adjust to the gas type. This eliminates the need for adjustment during installation, as is typical with other boilers. The controls also regulate for high altitudes and for mains voltage f