diff --git a/homeassistant/components/tankerkoenig/__init__.py b/homeassistant/components/tankerkoenig/__init__.py
index 3f654f24522..e8b4e92327c 100755
--- a/homeassistant/components/tankerkoenig/__init__.py
+++ b/homeassistant/components/tankerkoenig/__init__.py
@@ -2,7 +2,6 @@
 from datetime import timedelta
 import logging
 from math import ceil
-from uuid import UUID
 
 import pytankerkoenig
 import voluptuous as vol
@@ -26,26 +25,11 @@ _LOGGER = logging.getLogger(__name__)
 DEFAULT_RADIUS = 2
 DEFAULT_SCAN_INTERVAL = timedelta(minutes=30)
 
-
-def uuid4_string(value):
-    """Validate a v4 UUID in string format."""
-    try:
-        result = UUID(value, version=4)
-    except (ValueError, AttributeError, TypeError) as error:
-        raise vol.Invalid("Invalid Version4 UUID", error_message=str(error))
-
-    if str(result) != value.lower():
-        # UUID() will create a uuid4 if input is invalid
-        raise vol.Invalid("Invalid Version4 UUID")
-
-    return str(result)
-
-
 CONFIG_SCHEMA = vol.Schema(
     {
         DOMAIN: vol.Schema(
             {
-                vol.Required(CONF_API_KEY): uuid4_string,
+                vol.Required(CONF_API_KEY): cv.string,
                 vol.Optional(
                     CONF_SCAN_INTERVAL, default=DEFAULT_SCAN_INTERVAL
                 ): cv.time_period,
@@ -66,7 +50,7 @@ CONFIG_SCHEMA = vol.Schema(
                     cv.positive_int, vol.Range(min=1)
                 ),
                 vol.Optional(CONF_STATIONS, default=[]): vol.All(
-                    cv.ensure_list, [uuid4_string]
+                    cv.ensure_list, [cv.string]
                 ),
             }
         )
diff --git a/requirements_test_all.txt b/requirements_test_all.txt
index f0df372cde9..ba6f4d05565 100644
--- a/requirements_test_all.txt
+++ b/requirements_test_all.txt
@@ -588,9 +588,6 @@ pysonos==0.0.25
 # homeassistant.components.spc
 pyspcwebgw==0.4.0
 
-# homeassistant.components.tankerkoenig
-pytankerkoenig==0.0.6
-
 # homeassistant.components.ecobee
 python-ecobee-api==0.2.2
 
diff --git a/tests/components/tankerkoenig/__init__.py b/tests/components/tankerkoenig/__init__.py
deleted file mode 100755
index c420d23e157..00000000000
--- a/tests/components/tankerkoenig/__init__.py
+++ /dev/null
@@ -1 +0,0 @@
-"""Tests for the tankerkoenig integration."""
diff --git a/tests/components/tankerkoenig/test_tankerkoenig_validators.py b/tests/components/tankerkoenig/test_tankerkoenig_validators.py
deleted file mode 100755
index 7dba88b24fb..00000000000
--- a/tests/components/tankerkoenig/test_tankerkoenig_validators.py
+++ /dev/null
@@ -1,32 +0,0 @@
-"""The tests for the custom tankerkoenig validators."""
-import unittest
-import uuid
-
-import pytest
-import voluptuous as vol
-
-from homeassistant.components.tankerkoenig import uuid4_string
-
-
-class TestUUID4StringValidator(unittest.TestCase):
-    """Test the UUID4 string custom validator."""
-
-    def test_uuid4_string(caplog):
-        """Test string uuid validation."""
-        schema = vol.Schema(uuid4_string)
-
-        for value in ["Not a hex string", "0", 0]:
-            with pytest.raises(vol.Invalid):
-                schema(value)
-
-        with pytest.raises(vol.Invalid):
-            # the third block should start with 4
-            schema("a03d31b2-2eee-2acc-bb90-eec40be6ed23")
-
-        with pytest.raises(vol.Invalid):
-            # the fourth block should start with 8-a
-            schema("a03d31b2-2eee-4acc-1b90-eec40be6ed23")
-
-        _str = str(uuid.uuid4())
-        assert schema(_str) == _str
-        assert schema(_str.upper()) == _str