Viessmann vitodens 100 price Gas boilers usually pull on the air they might need for combustion either from inside the warmed surface or right from the outside. Extracting air directly from exterior, invisibly using a plastic pipe that moves via an outside wall, is much significantly more effective and secure.
Gas boilers usually pull on the air they might need for combustion either from inside the warmed surface or right from the outside. Extracting air directly from exterior, invisibly using a plastic pipe that moves via an outside wall, is much significantly more effective and secure.