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\documentclass[12pt,a4paper,oneside]{scrreprt} 
\usepackage[ngerman]{babel} 
\usepackage[utf8]{inputenc} 
\usepackage{pgfplots}% lädt auch tikz, xcolor, graphicx, ...
\pgfplotsset{compat=newest}% immer eine Angabe für compat machen
\begin{document} 
\begin{figure}[htb] 
    \begin{tikzpicture}
        \pgfplotsset{
            every linear axis/.append style={
                width = 15cm,
                height = 8cm,
                ybar,
                symbolic x coords={Druck,alle,Bypass,Speisewasser,Rezirkulation}, 
                xmin=Druck,
                xmax=Rezirkulation,
                enlarge x limits={abs=30pt},
                ymin = 0,
                ymax = 180,
            }
        }
        \begin{axis}[ 
                ylabel={y-Wett}, 
                xtick=data,
                ytick = {0,20,...,180},
        % die weiteren Optionen werden für das Bespiel gar nicht gebraucht
                %scaled ticks=false,
                %tick label style={/pgf/number format/fixed}, 
                %/pgf/number format/1000 sep={},
                %legend style={at={(0.5,-0.15)},
                %anchor=north,legend columns=-1},
            ] 
            \addplot coordinates 
            { 
                (Druck,171.481) 
                (Bypass,156.675) 
                (Speisewasser,151.896) 
                (Rezirkulation,147.301) 
                (alle,164.483) 
            }; 
            \addplot coordinates 
            { 
                (Druck,145.178) 
                (Bypass,158.066) 
                (Speisewasser,167.66) 
                (Rezirkulation,170.765) 
                (alle,155.93) 
            };
        \end{axis}
        \begin{axis}[ 
                axis lines=none
            ] 
            \addplot+[fill=blue] coordinates 
            { 
                (alle,164.483) 
            }; 
            \addplot+[fill=red] coordinates 
            { 
                (alle,155.93) 
            };
        \end{axis}
    \end{tikzpicture}
\end{figure}
\end{document}

\documentclass[12pt,a4paper,oneside]{scrreprt}
\usepackage[ngerman]{babel}
\usepackage[utf8]{inputenc}
\usepackage{graphicx}
\usepackage{color}
\usepackage{pgfplots}
\begin{document}


\begin{figure}[h]
\begin{tikzpicture}
\begin{axis}[
width = 15cm,
height = 8cm,
ybar,
ylabel={y-Wett},
symbolic x coords={Druck,alle,Bypass,Speisewasser,Rezirkulation},
xtick=data,
ymin = 0,
ymax = 180,
ytick = {0,20,...,180},
scaled ticks=false, 
tick label style={/pgf/number format/fixed},
/pgf/number format/1000 sep={},
legend style={at={(0.5,-0.15)},
anchor=north,legend columns=-1},
]
      \addplot coordinates 
      {
      (Druck,171.481)
      (Bypass,156.675)
      (Speisewasser,151.896)
      (Rezirkulation,147.301)
      (alle,164.483)
      }; 
      \addplot coordinates 
      {
      (Druck,145.178)
      (Bypass,158.066)
      (Speisewasser,167.66)
      (Rezirkulation,170.765)
      (alle,155.93)
      };          
\end{axis}
\end{tikzpicture}
\end{figure}
\end{document}