diff --git a/homeassistant/components/template/config_flow.py b/homeassistant/components/template/config_flow.py
index c361b4c42cc..cd6b7c8937f 100644
--- a/homeassistant/components/template/config_flow.py
+++ b/homeassistant/components/template/config_flow.py
@@ -37,8 +37,6 @@ from .const import DOMAIN
 from .sensor import async_create_preview_sensor
 from .template_entity import TemplateEntity
 
-NONE_SENTINEL = "none"
-
 
 def generate_schema(domain: str, flow_type: str) -> dict[vol.Marker, Any]:
     """Generate schema."""
@@ -48,71 +46,50 @@ def generate_schema(domain: str, flow_type: str) -> dict[vol.Marker, Any]:
         schema = {
             vol.Optional(CONF_DEVICE_CLASS): selector.SelectSelector(
                 selector.SelectSelectorConfig(
-                    options=[
-                        NONE_SENTINEL,
-                        *sorted(
-                            [cls.value for cls in BinarySensorDeviceClass],
-                            key=str.casefold,
-                        ),
-                    ],
+                    options=[cls.value for cls in BinarySensorDeviceClass],
                     mode=selector.SelectSelectorMode.DROPDOWN,
                     translation_key="binary_sensor_device_class",
+                    sort=True,
                 ),
             )
         }
 
     if domain == Platform.SENSOR:
         schema = {
-            vol.Optional(
-                CONF_UNIT_OF_MEASUREMENT, default=NONE_SENTINEL
-            ): selector.SelectSelector(
+            vol.Optional(CONF_UNIT_OF_MEASUREMENT): selector.SelectSelector(
                 selector.SelectSelectorConfig(
-                    options=[
-                        NONE_SENTINEL,
-                        *sorted(
-                            {
-                                str(unit)
-                                for units in DEVICE_CLASS_UNITS.values()
-                                for unit in units
-                                if unit is not None
-                            },
-                            key=str.casefold,
-                        ),
-                    ],
+                    options=list(
+                        {
+                            str(unit)
+                            for units in DEVICE_CLASS_UNITS.values()
+                            for unit in units
+                            if unit is not None
+                        }
+                    ),
                     mode=selector.SelectSelectorMode.DROPDOWN,
                     translation_key="sensor_unit_of_measurement",
                     custom_value=True,
+                    sort=True,
                 ),
             ),
-            vol.Optional(
-                CONF_DEVICE_CLASS, default=NONE_SENTINEL
-            ): selector.SelectSelector(
+            vol.Optional(CONF_DEVICE_CLASS): selector.SelectSelector(
                 selector.SelectSelectorConfig(
                     options=[
-                        NONE_SENTINEL,
-                        *sorted(
-                            [
-                                cls.value
-                                for cls in SensorDeviceClass
-                                if cls != SensorDeviceClass.ENUM
-                            ],
-                            key=str.casefold,
-                        ),
+                        cls.value
+                        for cls in SensorDeviceClass
+                        if cls != SensorDeviceClass.ENUM
                     ],
                     mode=selector.SelectSelectorMode.DROPDOWN,
                     translation_key="sensor_device_class",
+                    sort=True,
                 ),
             ),
-            vol.Optional(
-                CONF_STATE_CLASS, default=NONE_SENTINEL
-            ): selector.SelectSelector(
+            vol.Optional(CONF_STATE_CLASS): selector.SelectSelector(
                 selector.SelectSelectorConfig(
-                    options=[
-                        NONE_SENTINEL,
-                        *sorted([cls.value for cls in SensorStateClass]),
-                    ],
+                    options=[cls.value for cls in SensorStateClass],
                     mode=selector.SelectSelectorMode.DROPDOWN,
                     translation_key="sensor_state_class",
+                    sort=True,
                 ),
             ),
         }
@@ -144,15 +121,6 @@ async def choose_options_step(options: dict[str, Any]) -> str:
     return cast(str, options["template_type"])
 
 
-def _strip_sentinel(options: dict[str, Any]) -> None:
-    """Convert sentinel to None."""
-    for key in (CONF_DEVICE_CLASS, CONF_STATE_CLASS, CONF_UNIT_OF_MEASUREMENT):
-        if key not in options:
-            continue
-        if options[key] == NONE_SENTINEL:
-            options.pop(key)
-
-
 def _validate_unit(options: dict[str, Any]) -> None:
     """Validate unit of measurement."""
     if (
@@ -218,8 +186,6 @@ def validate_user_input(
         user_input: dict[str, Any],
     ) -> dict[str, Any]:
         """Add template type to user input."""
-        if template_type in (Platform.BINARY_SENSOR, Platform.SENSOR):
-            _strip_sentinel(user_input)
         if template_type == Platform.SENSOR:
             _validate_unit(user_input)
             _validate_state_class(user_input)
@@ -316,7 +282,6 @@ def ws_start_preview(
                 errors[key.schema] = str(ex.msg)
 
         if domain == Platform.SENSOR:
-            _strip_sentinel(user_input)
             try:
                 _validate_unit(user_input)
             except vol.Invalid as ex:
@@ -386,7 +351,6 @@ def ws_start_preview(
         )
         return
 
-    _strip_sentinel(msg["user_input"])
     preview_entity = CREATE_PREVIEW_ENTITY[template_type](hass, name, msg["user_input"])
     preview_entity.hass = hass
     preview_entity.registry_entry = entity_registry_entry
diff --git a/homeassistant/components/template/strings.json b/homeassistant/components/template/strings.json
index a0ee31126cd..8e7dbaade97 100644
--- a/homeassistant/components/template/strings.json
+++ b/homeassistant/components/template/strings.json
@@ -51,7 +51,6 @@
   "selector": {
     "binary_sensor_device_class": {
       "options": {
-        "none": "[%key:component::template::selector::sensor_device_class::options::none%]",
         "battery": "[%key:component::binary_sensor::entity_component::battery::name%]",
         "battery_charging": "[%key:component::binary_sensor::entity_component::battery_charging::name%]",
         "carbon_monoxide": "[%key:component::binary_sensor::entity_component::carbon_monoxide::name%]",
@@ -83,7 +82,6 @@
     },
     "sensor_device_class": {
       "options": {
-        "none": "No device class",
         "apparent_power": "[%key:component::sensor::entity_component::apparent_power::name%]",
         "aqi": "[%key:component::sensor::entity_component::aqi::name%]",
         "atmospheric_pressure": "[%key:component::sensor::entity_component::atmospheric_pressure::name%]",
@@ -137,7 +135,6 @@
     },
     "sensor_state_class": {
       "options": {
-        "none": "No state class",
         "measurement": "[%key:component::sensor::entity_component::_::state_attributes::state_class::state::measurement%]",
         "total": "[%key:component::sensor::entity_component::_::state_attributes::state_class::state::total%]",
         "total_increasing": "[%key:component::sensor::entity_component::_::state_attributes::state_class::state::total_increasing%]"