diff --git a/src/devices/water.cpp b/src/devices/water.cpp
index 17bcdf75f..e33c4c157 100644
--- a/src/devices/water.cpp
+++ b/src/devices/water.cpp
@@ -361,7 +361,7 @@ bool Water::set_wwCircTc(const char * value, const int8_t id) {
     if (!Helpers::value2bool(value, b)) {
         return false;
     }
-    write_command(0x33B + dhw_, 4, b ? 0x01 : 0x00, 0x33B + dhw_);
+    write_command(0x7A5, 4, b ? 0xFF : 0x00, 0x7A5);
     return true;
 }