diff --git a/heating-temperature-probes.yaml b/heating-temperature-probes.yaml
index e938071..2f1379c 100644
--- a/heating-temperature-probes.yaml
+++ b/heating-temperature-probes.yaml
@@ -59,3 +59,8 @@ sensor:
     update_interval: 10s
     address: 0x370417c1477fff28
 
+  - platform: dallas_temp
+    name: Secondary circuit return
+    update_interval: 10s
+    address: 0x490417c14146ff28
+