diff --git a/README.md b/README.md
index 73daa70..62b34ab 100644
--- a/README.md
+++ b/README.md
@@ -21,6 +21,7 @@ The following metrics are exposed:
 | `nilan_cts700_indoor_temp_wanted `| `20260` | Wanted room temperature | Celsius | `Gauge` |
 | `nilan_cts700_bypass_state` | `21773` | Bypass damper | | `Gauge` |
 | `nilan_cts700_water_temp_bottom` | `20522` | T12 bottom temperature in DHW water tank | Celsius | `Gauge` |
+| `nilan_cts700_water_temp_top` | `20520` | T11 top temperature in DHW water tank | Celsius | `Gauge` |
 | `nilan_cts700_water_temp_wanted` | `20460` | Hot water set point | Celsius | `Gauge` |
 | `nilan_cts700_humidity_average` | `20164` | Average Humidity | Percent | `Gauge` |
 
diff --git a/app/cts700_modbus.py b/app/cts700_modbus.py
index 0f10ce7..f80ed43 100644
--- a/app/cts700_modbus.py
+++ b/app/cts700_modbus.py
@@ -12,6 +12,7 @@
     "indoor_temp_wanted": [20260, 0.1],
     "bypass_state":       [21773, 1],
     "water_temp_bottom":  [20522, 0.11],
+    "water_temp_top":     [20520, 0.11],
     "water_temp_wanted":  [20460, 0.11],
     "humidity_average":   [20164, 1],
 }
diff --git a/app/prom_export.py b/app/prom_export.py
index 05780e0..b2960b8 100644
--- a/app/prom_export.py
+++ b/app/prom_export.py
@@ -14,6 +14,7 @@
 gIndoorTempWanted = Gauge('nilan_cts700_indoor_temp_wanted', 'Indoor temperature wanted', ['scale'])
 gBypassState = Gauge('nilan_cts700_bypass_state', 'Bypass state')
 gWaterTempBottom = Gauge('nilan_cts700_water_temp_bottom', 'Water temperature bottom', ['scale'])
+gWaterTempTop = Gauge('nilan_cts700_water_temp_top', 'Water temperature top', ['scale'])
 gWaterTempWanted = Gauge('nilan_cts700_water_temp_wanted', 'Water temperature wanted', ['scale'])
 gHumidityAverage = Gauge('nilan_cts700_humidity_average', 'Humidity average')
 
@@ -22,6 +23,7 @@
 gOutdoorTemp.labels('°C')
 gIndoorTempWanted.labels('°C')
 gWaterTempBottom.labels('°C')
+gWaterTempTop.labels('°C')
 gWaterTempWanted.labels('°C')
 
 
@@ -33,6 +35,7 @@ def setMetrics():
         gIndoorTempWanted.labels('°C').set(values['indoor_temp_wanted'])
         gBypassState.set(values['bypass_state'])
         gWaterTempBottom.labels('°C').set(values['water_temp_bottom'])
+        gWaterTempTop.labels('°C').set(values['water_temp_top'])
         gWaterTempWanted.labels('°C').set(values['water_temp_wanted'])
         gHumidityAverage.set(values['humidity_average'])
     except: