diff --git a/fhem/FHEM/92_FileLog.pm b/fhem/FHEM/92_FileLog.pm
index 433b77086..50619751e 100755
--- a/fhem/FHEM/92_FileLog.pm
+++ b/fhem/FHEM/92_FileLog.pm
@@ -262,15 +262,15 @@ FileLog_Get($@)
 
       } elsif($t == 2) {                    # delta-h  or delta-d
 
-        my $hd = $h->{didx};
-        my $ld = substr($fld[0],0,$hd);
+        my $hd = $h->{didx};                # TimeStamp-Length
+        my $ld = substr($fld[0],0,$hd);     # TimeStamp-Part (hour or date)
         if(!defined($h->{last1}) || $h->{last3} ne $ld) {
           if(defined($h->{last1})) {
             my @lda = split("[_:]", $lastdate{$hd});
-            my $ts = "12:00:00";                   # middle timestamp
+            my $ts = "12:00:00";            # middle timestamp
             $ts = "$lda[1]:30:00" if($hd == 13);
             my $v = $fld[$col]-$h->{last1};
-            $v = 0 if($v < 0);                     # Skip negative delta
+            $v = 0 if($v < 0);              # Skip negative delta
             $dte = "$lda[0]_$ts";
             $val = sprintf("%0.1f", $v);
           }
@@ -279,7 +279,6 @@ FileLog_Get($@)
         }
         $h->{last2} = $fld[$col];
         $lastdate{$hd} = $fld[0];
-
       } elsif($t == 3) {                    # int function
         $val = $1 if($fld[$col] =~ m/^(\d+).*/o);
 
@@ -312,7 +311,12 @@ FileLog_Get($@)
     my $h = $d[$i];
     my $hd = $h->{didx};
     if($hd && $lastdate{$hd}) {
-      my $val = defined($h->{last1}) ?  $h->{last2}-$h->{last1} : 0;
+      my $val = defined($h->{last1}) ? $h->{last2}-$h->{last1} : 0;
+      $min[$i] = $val if($min[$i] ==  999999);
+      $max[$i] = $val if($max[$i] == -999999);
+      $lastv[$i] = $val if(!$lastv[$i]);
+      $sum[$i] = $val if(!$sum[$i]);
+      $cnt[$i] = 1 if(!$cnt[$i]);
 
       my @lda = split("[_:]", $lastdate{$hd});
       my $ts = "12:00:00";                   # middle timestamp
diff --git a/fhem/webfrontend/pgm2/98_SVG.pm b/fhem/webfrontend/pgm2/98_SVG.pm
index 11ffaf359..1aeeabb24 100755
--- a/fhem/webfrontend/pgm2/98_SVG.pm
+++ b/fhem/webfrontend/pgm2/98_SVG.pm
@@ -240,8 +240,9 @@ SVG_render($$$$$$)
     # Round values, compute a nice step
     next if(!defined($hmax{$axis}));
     my $dh = $hmax{$axis} - $hmin{$axis};
-    my ($step, $mi, $ma);
-    my @limit = (1,2,5,10,20,50,100,200,500,1000,2000,5000,10000);
+    my ($step, $mi, $ma) = (1, 1, 1);
+    my @limit = (1,2,5,10,20,50,100,200,500,1000,2000,5000,10000,
+                 20000,50000,100000,200000,500000,1000000,2000000);
     for my $li (0..int(@limit)-1) {
       my $l = $limit[$li];
       next if($dh > $l);
diff --git a/fhem/webfrontend/pgm2/km271_1.gplot b/fhem/webfrontend/pgm2/km271_1.gplot
new file mode 100644
index 000000000..5fee3012a
--- /dev/null
+++ b/fhem/webfrontend/pgm2/km271_1.gplot
@@ -0,0 +1,41 @@
+############################
+# Display the Water temperature and burner runtime values.
+# Corresponding FileLog definition:
+# define KM271 FileLog /var/log/fhem/km271-%Y.log KM271
+
+set terminal png transparent size <SIZE> crop
+set output '<OUT>.png'
+set xdata time
+set timefmt "%Y-%m-%d_%H:%M:%S"
+set xlabel " "
+set ytics nomirror
+set y2tics
+set title '<L1>'
+set grid
+
+set y2label "Temperature in C"
+set format y "%0.1f"
+set ylabel "Minutes"
+set yrange [0:]
+
+#FileLog 4:Warmwasseristtemperatur:0:
+#FileLog 4:Brennerlaufzeit:0:delta-h
+#FileLog 4:Brennerlaufzeit:0:delta-d
+
+plot "<IN>" using 1:4 axes x1y2 title 'WW-Temp' with lines lw 2,\
+     "<grep Brennerlaufzeit <IN> | perl -ane '\
+        @a = split(\"[_:]\", $F[0]);\
+        if(defined($lh) && $lh ne $a[1])\
+          { printf(\"${ld}_$lh:30:00 %f\n\", $hv); $hv = 0; }\
+        if($lv) { $hv += ($F[3]-$lv); }\
+        $lh = $a[1]; $ld = $a[0]; $lv = $F[3];\
+        END { printf(\"${ld}_$lh:30:00 %f\n\", $hv) }'"\
+     using 1:2 axes x1y1 title 'Runtime/h (Min)' with histeps,\
+     "<grep Brennerlaufzeit <IN> | perl -ane '\
+        @a = split(\"[_]\", $F[0]);\
+        if(defined($ld) && $ld ne $a[0]) {\
+          printf(\"${ld}_12:00:00 %f\n\", $dv); $dv = 0; }\
+          if($lv) { $dv += ($F[3]-$lv); }\
+          $ld = $a[0]; $lv = $F[3];\
+          END {printf(\"${ld}_12:00:00 %f\n\", $dv)}'"\
+     using 1:2 axes x1y1 title 'Runtime/day (Min)' with histeps