diff --git a/assets/themes/openwindpowermap/openwindpowermap.json b/assets/themes/openwindpowermap/openwindpowermap.json
index 2330b885e..0f938fbd4 100644
--- a/assets/themes/openwindpowermap/openwindpowermap.json
+++ b/assets/themes/openwindpowermap/openwindpowermap.json
@@ -62,7 +62,8 @@
             "en": "What is the power output of this wind turbine? (e.g. 2.3 MW)"
           },
           "freeform": {
-            "key": "generator:output:electricity"
+            "key": "generator:output:electricity",
+            "type": "pfloat"
           }
         },
         {
@@ -85,7 +86,7 @@
           },
           "freeform": {
             "key": "height",
-            "type": "float"
+            "type": "pfloat"
           }
         },
         {
@@ -128,6 +129,23 @@
     }
   ],
   "units": [
+    {
+      "appliesToKey": [
+        "height","rotor:diameter"
+      ],
+      "applicableUnits": [
+        {
+          "canonicalDenomination": "m",
+          "alternativeDenomination": [
+            "meter"
+          ],
+          "human": {
+            "en": " meter",
+            "nl": " meter"
+          }
+        }
+      ]
+    },
     {
       "appliesToKey": [
         "generator:output:electricity"