dotlambda
diff --git a/‎CHANGELOG.md‎
Lines changed: 2 additions & 0 deletions b/‎CHANGELOG.md‎
Lines changed: 2 additions & 0 deletions
diff --git a/‎pymelcloud/atw_device.py‎
Lines changed: 3 additions & 13 deletions b/‎pymelcloud/atw_device.py‎
Lines changed: 3 additions & 13 deletions
diff --git a/‎tests/test_atw_properties.py‎
Lines changed: 1 addition & 1 deletion b/‎tests/test_atw_properties.py‎
Lines changed: 1 addition & 1 deletion
@@ -5,6 +5,8 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 ## [Unreleased]
+### Fixed
+- Use fixed tank temperature minimum.
 
 ## [2.5.1] - 2020-04-05
 ### Fixed
 
@@ -258,20 +258,10 @@ def target_tank_temperature(self) -> Optional[float]:
     def target_tank_temperature_min(self) -> Optional[float]:
         """Return minimum target tank water temperature.
 
-        The minimum value is not readily available from the API response.
-        MinSetTemperature initially looks like a good candidate, but the values of
-        MinSetTemperature and MaxSetTemperature are both 10°C lower than the values
-        displayed in MELCloud UI.
-
-        Given these circumstances the minimum is calculated by subtracting the
-        difference of MaxSetTemperature and MinSetTemperature from the
-        MaxTankTemperature.
+        The value does not seem to be available on the API. A fixed value is used
+        instead.
         """
-        device = self._device_conf.get("Device", {})
-        return device.get("MaxTankTemperature", 60.0) - (
-            device.get("MaxSetTemperature", 50.0)
-            - device.get("MinSetTemperature", 30.0)
-        )
+        return 40.0
 
     @property
     def target_tank_temperature_max(self) -> Optional[float]:
 
@@ -174,7 +174,7 @@ async def test_2zone_cancool():
     assert device.tank_temperature is None
     assert device.status is STATUS_UNKNOWN
     assert device.target_tank_temperature is None
-    assert device.target_tank_temperature_min == 42
+    assert device.target_tank_temperature_min == 40
     assert device.target_tank_temperature_max == 60
     assert device.holiday_mode is None