Add gallons per hour as volume flow rate unit (home-assistant#154246)

Co-authored-by: Christopher Fenner <[email protected]>

Author: autinerd

homeassistant/const.py

@@ -665,6 +665,7 @@ class UnitOfVolumeFlowRate(StrEnum):
     LITERS_PER_HOUR = "L/h"
     LITERS_PER_MINUTE = "L/min"
     LITERS_PER_SECOND = "L/s"
+    GALLONS_PER_HOUR = "gal/h"
     GALLONS_PER_MINUTE = "gal/min"
     MILLILITERS_PER_SECOND = "mL/s"
 

homeassistant/util/unit_conversion.py

@@ -826,6 +826,7 @@ class VolumeFlowRateConverter(BaseUnitConverter):
         UnitOfVolumeFlowRate.LITERS_PER_MINUTE: 1
         / (_HRS_TO_MINUTES * _L_TO_CUBIC_METER),
         UnitOfVolumeFlowRate.LITERS_PER_SECOND: 1 / (_HRS_TO_SECS * _L_TO_CUBIC_METER),
+        UnitOfVolumeFlowRate.GALLONS_PER_HOUR: 1 / _GALLON_TO_CUBIC_METER,
         UnitOfVolumeFlowRate.GALLONS_PER_MINUTE: 1
         / (_HRS_TO_MINUTES * _GALLON_TO_CUBIC_METER),
         UnitOfVolumeFlowRate.MILLILITERS_PER_SECOND: 1
@@ -839,6 +840,7 @@ class VolumeFlowRateConverter(BaseUnitConverter):
         UnitOfVolumeFlowRate.LITERS_PER_HOUR,
         UnitOfVolumeFlowRate.LITERS_PER_MINUTE,
         UnitOfVolumeFlowRate.LITERS_PER_SECOND,
+        UnitOfVolumeFlowRate.GALLONS_PER_HOUR,
         UnitOfVolumeFlowRate.GALLONS_PER_MINUTE,
         UnitOfVolumeFlowRate.MILLILITERS_PER_SECOND,
     }

tests/util/test_unit_conversion.py

@@ -977,6 +977,12 @@
             7.48051948,
             UnitOfVolumeFlowRate.GALLONS_PER_MINUTE,
         ),
+        (
+            1,
+            UnitOfVolumeFlowRate.LITERS_PER_HOUR,
+            0.264172052,
+            UnitOfVolumeFlowRate.GALLONS_PER_HOUR,
+        ),
         (
             9,
             UnitOfVolumeFlowRate.CUBIC_METERS_PER_HOUR,