A Vaillant flange set for the burner section of Vaillant ecoTEC VU (condensing), ecoTEC VUW (condensing) and ecoTEC VUI (condensing) boilers. The burner produces heat in a combustible heating appliance. In natural gas appliances, gas is transferred to a gas valve and into the burner for ignition. The heat created is used to heat the water in the master heat exchanger.

• Fits multiple appliances