Description Unlike any other condensing boilers, a third Xtra heat exchanger is integrated in the ecoGAS ProX, so no water tank is needed and infinite comfort is generated when showering and bathing, while preserving resources through the elimination of standby losses. ecoGAS ProX is a true 200% condensing boiler. It offers 100% efficiency and 100% comfort, as it always operates in the condensing range during heating mode and drinking water production – thanks to direct charge from the Xtra heat exchanger. Additional preheating in the Xtra heat exchanger results in a high draw-off flow rate up to 20.3 l/min. The large power range of 3.6 – 27 kW enables using ecoGAS ProX in small apartments and large single-family houses.