diff --git a/device.yaml b/device.yaml
deleted file mode 100644
index 3e19811..0000000
--- a/device.yaml
+++ /dev/null
@@ -1,9 +0,0 @@
-# this is just a simple test device setup that's used to compile and test the examples
-
-esphome:
-  name: custom_components_test
-
-esp32:
-  board: esp32dev
-  framework:
-    type: esp-idf
diff --git a/sthome-ut8.yaml b/sthome-ut8.yaml
index 60671c0..a5735a4 100644
--- a/sthome-ut8.yaml
+++ b/sthome-ut8.yaml
@@ -18,6 +18,8 @@ substitutions:
   friendly_name: "sthome-ut8"
   MAX_SCHOOL_HOLIDAY_PERIODS: 12
   BATTERY_INFO_TIMEOUT: 30  # 30 sec timeout
+  GEYSER_HEAT_IND_MIN: 20
+  GEYSER_HEAT_IND_MAX: 70
 
 esphome:
   name: "${name}"
@@ -3309,19 +3311,22 @@ script:
 
   - id: set_heat_indicators
     parameters: 
-      temp_bottom: double
-      temp_top: double      
+      low_value: double
+      high_value: double
     then:
       - lambda: |-
           double led_on = 1.0;
           int led_count = 8;
-          double min_temp = 30.0;
-          double max_temp = 70.0;
-          double step_size = (max_temp - min_temp) / led_count;
-          double bottom_point = (temp_bottom - min_temp) / step_size;
+          double min_value = ${GEYSER_HEAT_IND_MIN};
+          double max_value = ${GEYSER_HEAT_IND_MAX};
+          if(low_value < min_value) {
+            low_value = min_value;
+          }
+          double step_size = (max_value - min_value) / led_count;
+          double bottom_point = (low_value - min_value) / step_size;
           int led_bot = static_cast<int>(std::trunc(bottom_point));
           double led_bot_int = 1.0 + led_bot - bottom_point;
-          double top_point = (temp_top - min_temp) / step_size;
+          double top_point = (high_value - min_value) / step_size;
           int led_top = static_cast<int>(std::trunc(top_point));
           double led_top_int = top_point - led_top;
           double led_0 = 0;
@@ -3401,8 +3406,8 @@ script:
           id(led_geyser_temp4).turn_on().set_brightness(led_4).perform();
           id(led_geyser_temp5).turn_on().set_brightness(led_5).perform();
           id(led_geyser_temp6).turn_on().set_brightness(led_6).perform();
-          id(led_geyser_temp7).turn_on().set_brightness(led_7).perform();
-          //ESP_LOGI("geyser","bot: %f, top: %f 0: %0.2f 1: %0.2f 2: %0.2f 3: %0.2f 4: %0.2f 5: %0.2f 6: %0.2f 7: %0.2f ", temp_bottom, temp_top, led_0, led_1, led_2, led_3, led_4, led_5, led_6, led_7);
+          id(led_geyser_temp7).turn_on().set_brightness(led_7).perform();          
+          //ESP_LOGI("geyser","bot: %f, top: %f 0: %0.2f 1: %0.2f 2: %0.2f 3: %0.2f 4: %0.2f 5: %0.2f 6: %0.2f 7: %0.2f ", low_value, high_value, led_0, led_1, led_2, led_3, led_4, led_5, led_6, led_7);
 
  # do at 1 second intervals - check if geyser is on, and switch off if required
   - id: reset_geyser_relay