diff --git a/city_model_structure/energy_systems/water_to_water_hp.py b/city_model_structure/energy_systems/water_to_water_hp.py
index 60a97cac..ab81623f 100644
--- a/city_model_structure/energy_systems/water_to_water_hp.py
+++ b/city_model_structure/energy_systems/water_to_water_hp.py
@@ -20,8 +20,8 @@ class WaterToWaterHP(HeatPump):
     self._total_cooling_capacity = None
     self._power_demand = None
     self._flow_rate = None
-    self._total_cooling_capacity_coff = None
-    self._power_demand_coff = None
+    self._heat_output_coff = None  # b coefficients
+    self._power_demand_coff = None  # a coefficients
 
   @property
   def entering_water_temp(self) -> List[float]:
@@ -113,22 +113,22 @@ class WaterToWaterHP(HeatPump):
       self._flow_rate = value
 
   @property
-  def total_cooling_capacity_coff(self) -> List[float]:
+  def heat_output_coff(self) -> List[float]:
     """
     Get coefficients for total cooling capacity
     :return: [[float]]
     """
-    return self._total_cooling_capacity_coff
+    return self._heat_output_coff
 
-  @total_cooling_capacity_coff.setter
-  def total_cooling_capacity_coff(self, value):
+  @heat_output_coff.setter
+  def heat_output_coff(self, value):
     """
     Set coefficients for totol cooling capacity
     :param value: [[float]]
     :return:
     """
-    if self._total_cooling_capacity_coff is None:
-      self._total_cooling_capacity_coff = value
+    if self._heat_output_coff is None:
+      self._heat_output_coff = value
 
   @property
   def power_demand_coff(self) -> List[float]:
@@ -147,5 +147,3 @@ class WaterToWaterHP(HeatPump):
     """
     if self._power_demand_coff is None:
       self._power_demand_coff = value
-
-