diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 8f974905..e9dca7b7 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -18,7 +18,7 @@ repos:
     rev: 24.4.2
     hooks:
       - id: black
-        language_version: python3.10
+        language_version: python3.11
   - repo: https://github.com/PyCQA/flake8
     rev: 4.0.1
     hooks:
diff --git a/gsy_framework/constants_limits.py b/gsy_framework/constants_limits.py
index 951dde09..7586c0c2 100644
--- a/gsy_framework/constants_limits.py
+++ b/gsy_framework/constants_limits.py
@@ -213,6 +213,7 @@ class HeatPumpSettings:
         PREFERRED_BUYING_RATE = 30
         CALIBRATION_COEFFICIENT = 0.6
         CALIBRATION_COEFFICIENT_RANGE = RangeLimit(0, 1)
+        TANK_LOSS_PERCENT_DAY = 0
 
     class EVChargerSettings:
         """Default settings for EV charger assets."""