There are 26 pcs of industrial finned tube radiators Spiralix vertical RAT3 in 2,5m height installed in renovated commercial building group in Berlin city centre. The radiators are painted in RAL 1035 Pearl beige to fit in interior. Radiators are controlled remotely by electronic valves. One radiator has to be adapted on measure to fit on old pipe connections. The group of historical terrace houses from end of 19th century were designed by german architects Heinrich Joseph Kayser und Karl von Großheim and are a part of architectural heritage of Berlin.