diff --git a/homeassistant/components/smarttub/climate.py b/homeassistant/components/smarttub/climate.py
index b2d4fbf17c46..9f1802e7327e 100644
--- a/homeassistant/components/smarttub/climate.py
+++ b/homeassistant/components/smarttub/climate.py
@@ -23,11 +23,13 @@ from .const import DEFAULT_MAX_TEMP, DEFAULT_MIN_TEMP, DOMAIN, SMARTTUB_CONTROLL
 from .entity import SmartTubEntity
 
 PRESET_DAY = "day"
+PRESET_READY = "ready"
 
 PRESET_MODES = {
     Spa.HeatMode.AUTO: PRESET_NONE,
     Spa.HeatMode.ECONOMY: PRESET_ECO,
     Spa.HeatMode.DAY: PRESET_DAY,
+    Spa.HeatMode.READY: PRESET_READY,
 }
 
 HEAT_MODES = {v: k for k, v in PRESET_MODES.items()}
diff --git a/tests/components/smarttub/test_climate.py b/tests/components/smarttub/test_climate.py
index 601015ca6817..40e3c05b509d 100644
--- a/tests/components/smarttub/test_climate.py
+++ b/tests/components/smarttub/test_climate.py
@@ -58,7 +58,7 @@ async def test_thermostat_update(
     assert state.attributes[ATTR_TEMPERATURE] == 39
     assert state.attributes[ATTR_MAX_TEMP] == DEFAULT_MAX_TEMP
     assert state.attributes[ATTR_MIN_TEMP] == DEFAULT_MIN_TEMP
-    assert state.attributes[ATTR_PRESET_MODES] == ["none", "eco", "day"]
+    assert state.attributes[ATTR_PRESET_MODES] == ["none", "eco", "day", "ready"]
 
     await hass.services.async_call(
         CLIMATE_DOMAIN,