diff --git a/README.md b/README.md
index 8867ea6..8059e2e 100755
--- a/README.md
+++ b/README.md
@@ -495,7 +495,12 @@ Passed as an argument to the emitted `heatModeChanged` event. The passed version
 * `controllerId` - integer indicating the ID of the controller to send this command to.
   * Note that while `SLControllerConfigMessage` includes a controllerId, this ID, in my experience, should always be 0.
 * `bodyType` - integer indicating the type of body to set the setpoint of. The pool is body `0` and the spa is body `1`.
-* `heatMode` - integer indicating the desired heater mode. Valid values are: 0: "Off", 1: "Solar", 2 : "Solar Preferred", 3 : "Heat Pump", 4: "Don't Change"
+* `heatMode` - integer indicating the desired heater mode. Valid values are:
+  * ScreenLogic.HEAT_MODE_OFF
+  * ScreenLogic.HEAT_MODE_SOLAR
+  * ScreenLogic.HEAT_MODE_SOLARPREFERRED
+  * ScreenLogic.HEAT_MODE_HEATPUMP
+  * ScreenLogic.HEAT_MODE_DONTCHANGE
 
 ## SLLightControlMessage
 
@@ -579,7 +584,12 @@ Passed as an argument to the emitted `setScheduleEventById` event. Configures an
 * `flags`
 	* bit 0 is the schedule type, if 0 then regular event, if 1 its a run-once
 	* bit 1 indicates whether heat setPoint should be changed 
-* `heatCmd` - integer indicating the desired heater mode. Valid values are: 0: "Off", 1: "Solar", 2 : "Solar Preferred", 3 : "Heat Pump", 4: "Don't Change"
+* `heatCmd` - integer indicating the desired heater mode. Valid values are:
+  * ScreenLogic.HEAT_MODE_OFF
+  * ScreenLogic.HEAT_MODE_SOLAR
+  * ScreenLogic.HEAT_MODE_SOLARPREFERRED
+  * ScreenLogic.HEAT_MODE_HEATPUMP
+  * ScreenLogic.HEAT_MODE_DONTCHANGE
 * `heatSetPoint` - the temperature set point if heat is to be changed (ignored if bit 1 of flags is 0)
 
 ## SLSetCircuitRuntimeById
diff --git a/index.js b/index.js
index e6d082e..11016dd 100644
--- a/index.js
+++ b/index.js
@@ -389,6 +389,11 @@ module.exports = {
   LIGHT_CMD_COLOR_RED: 15,
   LIGHT_CMD_COLOR_WHITE: 16,
   LIGHT_CMD_COLOR_PURPLE: 17,
+  HEAT_MODE_OFF: 0,
+  HEAT_MODE_SOLAR: 1,
+  HEAT_MODE_SOLARPREFERRED: 2,
+  HEAT_MODE_HEATPUMP: 3,
+  HEAT_MODE_DONTCHANGE: 4,
   PUMP_TYPE_INTELLIFLOVF: 1,
   PUMP_TYPE_INTELLIFLOVS: 2,
   PUMP_TYPE_INTELLIFLOVSF: 3,