diff --git a/esphome/components/opentherm/input.py b/esphome/components/opentherm/input.py
index c5814f74e2c..e711e4df8eb 100644
--- a/esphome/components/opentherm/input.py
+++ b/esphome/components/opentherm/input.py
@@ -2,51 +2,48 @@ from typing import Any
 
 import esphome.codegen as cg
 import esphome.config_validation as cv
+from esphome.const import CONF_MAX_VALUE, CONF_MIN_VALUE
 
 from . import generate, schema
 
-CONF_min_value = "min_value"
-CONF_max_value = "max_value"
-CONF_auto_min_value = "auto_min_value"
-CONF_auto_max_value = "auto_max_value"
-CONF_step = "step"
+CONF_AUTO_MIN_VALUE = "auto_min_value"
+CONF_AUTO_MAX_VALUE = "auto_max_value"
 
 OpenthermInput = generate.opentherm_ns.class_("OpenthermInput")
 
 
 def validate_min_value_less_than_max_value(conf):
     if (
-        CONF_min_value in conf
-        and CONF_max_value in conf
-        and conf[CONF_min_value] > conf[CONF_max_value]
+        CONF_MIN_VALUE in conf
+        and CONF_MAX_VALUE in conf
+        and conf[CONF_MIN_VALUE] > conf[CONF_MAX_VALUE]
     ):
-        raise cv.Invalid(f"{CONF_min_value} must be less than {CONF_max_value}")
+        raise cv.Invalid(f"{CONF_MIN_VALUE} must be less than {CONF_MAX_VALUE}")
     return conf
 
 
 def input_schema(entity: schema.InputSchema) -> cv.Schema:
     result = cv.Schema(
         {
-            cv.Optional(CONF_min_value, entity.range[0]): cv.float_range(
+            cv.Optional(CONF_MIN_VALUE, entity.range[0]): cv.float_range(
                 entity.range[0], entity.range[1]
             ),
-            cv.Optional(CONF_max_value, entity.range[1]): cv.float_range(
+            cv.Optional(CONF_MAX_VALUE, entity.range[1]): cv.float_range(
                 entity.range[0], entity.range[1]
             ),
         }
     )
     result = result.add_extra(validate_min_value_less_than_max_value)
-    result = result.extend({cv.Optional(CONF_step, False): cv.float_})
     if entity.auto_min_value is not None:
-        result = result.extend({cv.Optional(CONF_auto_min_value, False): cv.boolean})
+        result = result.extend({cv.Optional(CONF_AUTO_MIN_VALUE, False): cv.boolean})
     if entity.auto_max_value is not None:
-        result = result.extend({cv.Optional(CONF_auto_max_value, False): cv.boolean})
+        result = result.extend({cv.Optional(CONF_AUTO_MAX_VALUE, False): cv.boolean})
 
     return result
 
 
 def generate_setters(entity: cg.MockObj, conf: dict[str, Any]) -> None:
-    generate.add_property_set(entity, CONF_min_value, conf)
-    generate.add_property_set(entity, CONF_max_value, conf)
-    generate.add_property_set(entity, CONF_auto_min_value, conf)
-    generate.add_property_set(entity, CONF_auto_max_value, conf)
+    generate.add_property_set(entity, CONF_MIN_VALUE, conf)
+    generate.add_property_set(entity, CONF_MAX_VALUE, conf)
+    generate.add_property_set(entity, CONF_AUTO_MIN_VALUE, conf)
+    generate.add_property_set(entity, CONF_AUTO_MAX_VALUE, conf)
diff --git a/esphome/components/opentherm/number/__init__.py b/esphome/components/opentherm/number/__init__.py
index 6dbc45f49be..17ec12a61ab 100644
--- a/esphome/components/opentherm/number/__init__.py
+++ b/esphome/components/opentherm/number/__init__.py
@@ -3,7 +3,13 @@ from typing import Any
 import esphome.codegen as cg
 from esphome.components import number
 import esphome.config_validation as cv
-from esphome.const import CONF_INITIAL_VALUE, CONF_RESTORE_VALUE, CONF_STEP
+from esphome.const import (
+    CONF_INITIAL_VALUE,
+    CONF_MAX_VALUE,
+    CONF_MIN_VALUE,
+    CONF_RESTORE_VALUE,
+    CONF_STEP,
+)
 
 from .. import const, generate, input, schema, validate
 
@@ -18,9 +24,9 @@ OpenthermNumber = generate.opentherm_ns.class_(
 async def new_openthermnumber(config: dict[str, Any]) -> cg.Pvariable:
     var = await number.new_number(
         config,
-        min_value=config[input.CONF_min_value],
-        max_value=config[input.CONF_max_value],
-        step=config[input.CONF_step],
+        min_value=config[CONF_MIN_VALUE],
+        max_value=config[CONF_MAX_VALUE],
+        step=config[CONF_STEP],
     )
     await cg.register_component(var, config)
     input.generate_setters(var, config)