From 3e20c506f4fda6d096a91d7df2e7b068be350ec2 Mon Sep 17 00:00:00 2001
From: Sid <27780930+autinerd@users.noreply.github.com>
Date: Tue, 14 Oct 2025 16:16:48 +0200
Subject: [PATCH] Add gallons per hour as volume flow rate unit (#154246)

Co-authored-by: Christopher Fenner <9592452+CFenner@users.noreply.github.com>
---
 homeassistant/const.py                | 1 +
 homeassistant/util/unit_conversion.py | 2 ++
 tests/util/test_unit_conversion.py    | 6 ++++++
 3 files changed, 9 insertions(+)

diff --git a/homeassistant/const.py b/homeassistant/const.py
index 13f61eec6b1..d8869dfd6e9 100644
--- a/homeassistant/const.py
+++ b/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"
 
diff --git a/homeassistant/util/unit_conversion.py b/homeassistant/util/unit_conversion.py
index 44ea5cbdd90..c3deae749a9 100644
--- a/homeassistant/util/unit_conversion.py
+++ b/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,
     }
diff --git a/tests/util/test_unit_conversion.py b/tests/util/test_unit_conversion.py
index 91a9ed08479..26a6b180520 100644
--- a/tests/util/test_unit_conversion.py
+++ b/tests/util/test_unit_conversion.py
@@ -977,6 +977,12 @@ _CONVERTED_VALUE: dict[
             7.48051948,
             UnitOfVolumeFlowRate.GALLONS_PER_MINUTE,
         ),
+        (
+            1,
+            UnitOfVolumeFlowRate.LITERS_PER_HOUR,
+            0.264172052,
+            UnitOfVolumeFlowRate.GALLONS_PER_HOUR,
+        ),
         (
             9,
             UnitOfVolumeFlowRate.CUBIC_METERS_PER_HOUR,