Pio ® Stylish tubular design The minimalist design is based on the use of round, vertical heating pipes. They are connected to the manifold pipes using invisible welded joints, using what is know as [...] Pio ® Stylish tubular design The minimalist design is based on the use of round, vertical heating pipes. They are connected to the manifold pipes using invisible welded joints, using what is know as the cross welding process. The gaps between the heating pipes are easy to access and clean. This is conducive to creating an indoor climate with less dust, which is [...]