Vaillant EcoTEC intro condensing boiler VMW 24/28 AS/1-1 24 kW methane sealed chamberVMW 24 28 AS 1 1 Methane convertible to propane 24 kW heating Ideal for heating rooms up to 150 m with an average height of 2. 7 m 28 kW in domestic hot water For a domestic hot water production (T = 30K) of 13. 4 l min. THE BOILER The EcoTEC Intro condensing boiler is the smallest of the Vaillant family: ecoTEC intro is the brand new condensing boiler from the Leprotto brand designed for those who want to approach this type of boiler by relying on