diff --git a/pkgs/development/python-modules/eurotronic-cometblue-ha/default.nix b/pkgs/development/python-modules/eurotronic-cometblue-ha/default.nix
new file mode 100644
index 000000000000..ad6b99a36788
--- /dev/null
+++ b/pkgs/development/python-modules/eurotronic-cometblue-ha/default.nix
@@ -0,0 +1,41 @@
+{
+  lib,
+  buildPythonPackage,
+  fetchFromGitHub,
+  pdm-backend,
+  bleak,
+  bleak-retry-connector,
+}:
+
+buildPythonPackage (finalAttrs: {
+  pname = "eurotronic-cometblue-ha";
+  version = "1.4.0";
+  pyproject = true;
+
+  src = fetchFromGitHub {
+    owner = "rikroe";
+    repo = "eurotronic-cometblue";
+    tag = "v${finalAttrs.version}";
+    hash = "sha256-j3UuN0Cmb2mOo3QGqy0wu19+vRyMahclXKyka2Vy10w=";
+  };
+
+  build-system = [ pdm-backend ];
+
+  dependencies = [
+    bleak
+    bleak-retry-connector
+  ];
+
+  # Tests require a real Bluetooth Comet Blue device.
+  doCheck = false;
+
+  pythonImportsCheck = [ "eurotronic_cometblue_ha" ];
+
+  meta = {
+    description = "Python client for Eurotronic GmbH BLE Comet (and rebranded) Radiator TRVs";
+    homepage = "https://github.com/rikroe/eurotronic-cometblue";
+    changelog = "https://github.com/rikroe/eurotronic-cometblue/releases/tag/${finalAttrs.src.tag}";
+    license = lib.licenses.mit;
+    maintainers = [ lib.maintainers.jamiemagee ];
+  };
+})
diff --git a/pkgs/servers/home-assistant/component-packages.nix b/pkgs/servers/home-assistant/component-packages.nix
index 04af0a467488..ae53e5b6f229 100644
--- a/pkgs/servers/home-assistant/component-packages.nix
+++ b/pkgs/servers/home-assistant/component-packages.nix
@@ -1761,9 +1761,10 @@
         bluetooth-auto-recovery
         bluetooth-data-tools
         dbus-fast
+        eurotronic-cometblue-ha
         habluetooth
         serialx
-      ]; # missing inputs: eurotronic-cometblue-ha
+      ];
     "event" =
       ps: with ps; [
       ];
@@ -7688,6 +7689,7 @@
     "esphome"
     "essent"
     "eufylife_ble"
+    "eurotronic_cometblue"
     "event"
     "everlights"
     "evil_genius_labs"
diff --git a/pkgs/top-level/python-packages.nix b/pkgs/top-level/python-packages.nix
index f32ed99f5771..542097f1ddc2 100644
--- a/pkgs/top-level/python-packages.nix
+++ b/pkgs/top-level/python-packages.nix
@@ -5184,6 +5184,8 @@ self: super: with self; {
 
   euporie = callPackage ../development/python-modules/euporie { };
 
+  eurotronic-cometblue-ha = callPackage ../development/python-modules/eurotronic-cometblue-ha { };
+
   eval-type-backport = callPackage ../development/python-modules/eval-type-backport { };
 
   evaluate = callPackage ../development/python-modules/evaluate { };