diff --git a/pkgs/development/python-modules/pysaunum/default.nix b/pkgs/development/python-modules/pysaunum/default.nix
new file mode 100644
index 000000000000..9c97b665b580
--- /dev/null
+++ b/pkgs/development/python-modules/pysaunum/default.nix
@@ -0,0 +1,43 @@
+{
+  lib,
+  buildPythonPackage,
+  fetchFromGitHub,
+  setuptools,
+  pymodbus,
+  pytestCheckHook,
+  pytest-asyncio,
+  pytest-timeout,
+}:
+
+buildPythonPackage (finalAttrs: {
+  pname = "pysaunum";
+  version = "0.5.0";
+  pyproject = true;
+
+  src = fetchFromGitHub {
+    owner = "mettolen";
+    repo = "pysaunum";
+    tag = "v${finalAttrs.version}";
+    hash = "sha256-0O/U79265YCr3iauVxXL0NRjVy7TZhlfUV3idfYa3fc=";
+  };
+
+  build-system = [ setuptools ];
+
+  dependencies = [ pymodbus ];
+
+  nativeCheckInputs = [
+    pytestCheckHook
+    pytest-asyncio
+    pytest-timeout
+  ];
+
+  pythonImportsCheck = [ "pysaunum" ];
+
+  meta = {
+    description = "Python library for controlling Saunum sauna controllers via Modbus TCP";
+    homepage = "https://github.com/mettolen/pysaunum";
+    changelog = "https://github.com/mettolen/pysaunum/releases/tag/v${finalAttrs.version}";
+    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 34e3b668e27d..bc9b75a56b7d 100644
--- a/pkgs/servers/home-assistant/component-packages.nix
+++ b/pkgs/servers/home-assistant/component-packages.nix
@@ -5392,7 +5392,8 @@
       ];
     "saunum" =
       ps: with ps; [
-      ]; # missing inputs: pysaunum
+        pysaunum
+      ];
     "scene" =
       ps: with ps; [
       ];
@@ -8013,6 +8014,7 @@
     "samsungtv"
     "sanix"
     "satel_integra"
+    "saunum"
     "scene"
     "schedule"
     "schlage"
diff --git a/pkgs/top-level/python-packages.nix b/pkgs/top-level/python-packages.nix
index 529cba15afd2..ea8eaec3b412 100644
--- a/pkgs/top-level/python-packages.nix
+++ b/pkgs/top-level/python-packages.nix
@@ -14841,6 +14841,8 @@ self: super: with self; {
 
   pysatochip = callPackage ../development/python-modules/pysatochip { };
 
+  pysaunum = callPackage ../development/python-modules/pysaunum { };
+
   pysbd = callPackage ../development/python-modules/pysbd { };
 
   pysc2 = callPackage ../development/python-modules/pysc2 { };