diff --git a/pkgs/development/python-modules/heatmiserv3/default.nix b/pkgs/development/python-modules/heatmiserv3/default.nix
new file mode 100644
index 000000000000..5d7ed86f225b
--- /dev/null
+++ b/pkgs/development/python-modules/heatmiserv3/default.nix
@@ -0,0 +1,46 @@
+{
+  appdirs,
+  buildPythonPackage,
+  fetchFromGitHub,
+  importlib-resources,
+  lib,
+  poetry-core,
+  pyserial,
+  pyserial-asyncio,
+  pytestCheckHook,
+  pyyaml,
+}:
+
+buildPythonPackage rec {
+  pname = "heatmiserv3";
+  version = "2.0.3";
+  pyproject = true;
+
+  src = fetchFromGitHub {
+    owner = "andylockran";
+    repo = "heatmiserV3";
+    rev = "refs/tags/${version}";
+    hash = "sha256-Ia0QUMDvuvn2af52lW7ObSQ9MSPNOgWyBuFBnqfYrpM=";
+  };
+
+  build-system = [ poetry-core ];
+
+  dependencies = [
+    appdirs
+    importlib-resources
+    pyserial
+    pyserial-asyncio
+    pyyaml
+  ];
+
+  pythonImportsCheck = [ "heatmiserv3" ];
+
+  nativeCheckInputs = [ pytestCheckHook ];
+
+  meta = {
+    description = "Library to interact with Heatmiser Themostats using V3 protocol";
+    homepage = "https://github.com/andylockran/heatmiserV3";
+    license = lib.licenses.mit;
+    maintainers = with lib.maintainers; [ dotlambda ];
+  };
+}
diff --git a/pkgs/servers/home-assistant/component-packages.nix b/pkgs/servers/home-assistant/component-packages.nix
index eb9c323f79c6..c049b0f345df 100644
--- a/pkgs/servers/home-assistant/component-packages.nix
+++ b/pkgs/servers/home-assistant/component-packages.nix
@@ -1583,7 +1583,8 @@
       pycec
     ];
     "heatmiser" = ps: with ps; [
-    ]; # missing inputs: heatmiserV3
+      heatmiserv3
+    ];
     "heiwa" = ps: with ps; [
     ];
     "heos" = ps: with ps; [
diff --git a/pkgs/top-level/python-packages.nix b/pkgs/top-level/python-packages.nix
index a0477cd0526f..440f6c6cf54b 100644
--- a/pkgs/top-level/python-packages.nix
+++ b/pkgs/top-level/python-packages.nix
@@ -5509,6 +5509,8 @@ self: super: with self; {
 
   heapdict = callPackage ../development/python-modules/heapdict { };
 
+  heatmiserv3 = callPackage ../development/python-modules/heatmiserv3 { };
+
   heatshrink2 = callPackage ../development/python-modules/heatshrink2 { };
 
   heatzypy = callPackage ../development/python-modules/heatzypy { };