diff --git a/pkgs/development/python-modules/waterfurnace/default.nix b/pkgs/development/python-modules/waterfurnace/default.nix
new file mode 100644
index 00000000000..a07c1e6333e
--- /dev/null
+++ b/pkgs/development/python-modules/waterfurnace/default.nix
@@ -0,0 +1,43 @@
+{ lib
+, buildPythonPackage
+, click
+, fetchFromGitHub
+, mock
+, pytest-runner
+, pytestCheckHook
+, requests
+, websocket_client
+}:
+
+buildPythonPackage rec {
+  pname = "waterfurnace";
+  version = "1.1.0";
+
+  src = fetchFromGitHub {
+    owner = "sdague";
+    repo = pname;
+    rev = "v${version}";
+    sha256 = "1ba247fw1fvi7zy31zj2wbjq7fajrbxhp139cl9jj67rfvxfv8xf";
+  };
+
+  propagatedBuildInputs = [
+    click
+    pytest-runner
+    requests
+    websocket_client
+  ];
+
+  checkInputs = [
+    mock
+    pytestCheckHook
+  ];
+
+  pythonImportsCheck = [ "waterfurnace" ];
+
+  meta = with lib; {
+    description = "Python interface to waterfurnace geothermal systems";
+    homepage = "https://github.com/sdague/waterfurnace";
+    license = with licenses; [ asl20 ];
+    maintainers = with maintainers; [ fab ];
+  };
+}
diff --git a/pkgs/servers/home-assistant/component-packages.nix b/pkgs/servers/home-assistant/component-packages.nix
index b7c72607f06..01c0175228c 100644
--- a/pkgs/servers/home-assistant/component-packages.nix
+++ b/pkgs/servers/home-assistant/component-packages.nix
@@ -915,7 +915,7 @@
     "wake_on_lan" = ps: with ps; [ wakeonlan ];
     "waqi" = ps: with ps; [ ]; # missing inputs: waqiasync
     "water_heater" = ps: with ps; [ ];
-    "waterfurnace" = ps: with ps; [ ]; # missing inputs: waterfurnace
+    "waterfurnace" = ps: with ps; [ waterfurnace ];
     "watson_iot" = ps: with ps; [ ]; # missing inputs: ibmiotf
     "watson_tts" = ps: with ps; [ ]; # missing inputs: ibm-watson
     "waze_travel_time" = ps: with ps; [ WazeRouteCalculator ];
diff --git a/pkgs/top-level/python-packages.nix b/pkgs/top-level/python-packages.nix
index fe514945aa8..97fd9c0e02b 100644
--- a/pkgs/top-level/python-packages.nix
+++ b/pkgs/top-level/python-packages.nix
@@ -8021,6 +8021,8 @@ in {
 
   watchdog = callPackage ../development/python-modules/watchdog { };
 
+  waterfurnace = callPackage ../development/python-modules/waterfurnace { };
+
   WazeRouteCalculator = callPackage ../development/python-modules/WazeRouteCalculator { };
 
   wcwidth = callPackage ../development/python-modules/wcwidth { };