diff --git a/homeassistant/components/incomfort/entity.py b/homeassistant/components/incomfort/entity.py
index 33037a78edf..dd662b411dd 100644
--- a/homeassistant/components/incomfort/entity.py
+++ b/homeassistant/components/incomfort/entity.py
@@ -26,4 +26,5 @@ class IncomfortBoilerEntity(IncomfortEntity):
             identifiers={(DOMAIN, heater.serial_no)},
             manufacturer="Intergas",
             name="Boiler",
+            serial_number=heater.serial_no,
         )