diff --git a/esphome/components/prometheus/prometheus_handler.cpp b/esphome/components/prometheus/prometheus_handler.cpp
index 68bca95a21..09913bd713 100644
--- a/esphome/components/prometheus/prometheus_handler.cpp
+++ b/esphome/components/prometheus/prometheus_handler.cpp
@@ -65,8 +65,8 @@ std::string PrometheusHandler::relabel_name_(EntityBase *obj) {
 // Type-specific implementation
 #ifdef USE_SENSOR
 void PrometheusHandler::sensor_type_(AsyncResponseStream *stream) {
-  stream->print(F("#TYPE esphome_sensor_value GAUGE\n"));
-  stream->print(F("#TYPE esphome_sensor_failed GAUGE\n"));
+  stream->print(F("#TYPE esphome_sensor_value gauge\n"));
+  stream->print(F("#TYPE esphome_sensor_failed gauge\n"));
 }
 void PrometheusHandler::sensor_row_(AsyncResponseStream *stream, sensor::Sensor *obj) {
   if (obj->is_internal() && !this->include_internal_)
@@ -102,8 +102,8 @@ void PrometheusHandler::sensor_row_(AsyncResponseStream *stream, sensor::Sensor
 // Type-specific implementation
 #ifdef USE_BINARY_SENSOR
 void PrometheusHandler::binary_sensor_type_(AsyncResponseStream *stream) {
-  stream->print(F("#TYPE esphome_binary_sensor_value GAUGE\n"));
-  stream->print(F("#TYPE esphome_binary_sensor_failed GAUGE\n"));
+  stream->print(F("#TYPE esphome_binary_sensor_value gauge\n"));
+  stream->print(F("#TYPE esphome_binary_sensor_failed gauge\n"));
 }
 void PrometheusHandler::binary_sensor_row_(AsyncResponseStream *stream, binary_sensor::BinarySensor *obj) {
   if (obj->is_internal() && !this->include_internal_)
@@ -136,10 +136,10 @@ void PrometheusHandler::binary_sensor_row_(AsyncResponseStream *stream, binary_s
 
 #ifdef USE_FAN
 void PrometheusHandler::fan_type_(AsyncResponseStream *stream) {
-  stream->print(F("#TYPE esphome_fan_value GAUGE\n"));
-  stream->print(F("#TYPE esphome_fan_failed GAUGE\n"));
-  stream->print(F("#TYPE esphome_fan_speed GAUGE\n"));
-  stream->print(F("#TYPE esphome_fan_oscillation GAUGE\n"));
+  stream->print(F("#TYPE esphome_fan_value gauge\n"));
+  stream->print(F("#TYPE esphome_fan_failed gauge\n"));
+  stream->print(F("#TYPE esphome_fan_speed gauge\n"));
+  stream->print(F("#TYPE esphome_fan_oscillation gauge\n"));
 }
 void PrometheusHandler::fan_row_(AsyncResponseStream *stream, fan::Fan *obj) {
   if (obj->is_internal() && !this->include_internal_)
@@ -182,9 +182,9 @@ void PrometheusHandler::fan_row_(AsyncResponseStream *stream, fan::Fan *obj) {
 
 #ifdef USE_LIGHT
 void PrometheusHandler::light_type_(AsyncResponseStream *stream) {
-  stream->print(F("#TYPE esphome_light_state GAUGE\n"));
-  stream->print(F("#TYPE esphome_light_color GAUGE\n"));
-  stream->print(F("#TYPE esphome_light_effect_active GAUGE\n"));
+  stream->print(F("#TYPE esphome_light_state gauge\n"));
+  stream->print(F("#TYPE esphome_light_color gauge\n"));
+  stream->print(F("#TYPE esphome_light_effect_active gauge\n"));
 }
 void PrometheusHandler::light_row_(AsyncResponseStream *stream, light::LightState *obj) {
   if (obj->is_internal() && !this->include_internal_)
@@ -259,8 +259,8 @@ void PrometheusHandler::light_row_(AsyncResponseStream *stream, light::LightStat
 
 #ifdef USE_COVER
 void PrometheusHandler::cover_type_(AsyncResponseStream *stream) {
-  stream->print(F("#TYPE esphome_cover_value GAUGE\n"));
-  stream->print(F("#TYPE esphome_cover_failed GAUGE\n"));
+  stream->print(F("#TYPE esphome_cover_value gauge\n"));
+  stream->print(F("#TYPE esphome_cover_failed gauge\n"));
 }
 void PrometheusHandler::cover_row_(AsyncResponseStream *stream, cover::Cover *obj) {
   if (obj->is_internal() && !this->include_internal_)
@@ -302,8 +302,8 @@ void PrometheusHandler::cover_row_(AsyncResponseStream *stream, cover::Cover *ob
 
 #ifdef USE_SWITCH
 void PrometheusHandler::switch_type_(AsyncResponseStream *stream) {
-  stream->print(F("#TYPE esphome_switch_value GAUGE\n"));
-  stream->print(F("#TYPE esphome_switch_failed GAUGE\n"));
+  stream->print(F("#TYPE esphome_switch_value gauge\n"));
+  stream->print(F("#TYPE esphome_switch_failed gauge\n"));
 }
 void PrometheusHandler::switch_row_(AsyncResponseStream *stream, switch_::Switch *obj) {
   if (obj->is_internal() && !this->include_internal_)
@@ -326,8 +326,8 @@ void PrometheusHandler::switch_row_(AsyncResponseStream *stream, switch_::Switch
 
 #ifdef USE_LOCK
 void PrometheusHandler::lock_type_(AsyncResponseStream *stream) {
-  stream->print(F("#TYPE esphome_lock_value GAUGE\n"));
-  stream->print(F("#TYPE esphome_lock_failed GAUGE\n"));
+  stream->print(F("#TYPE esphome_lock_value gauge\n"));
+  stream->print(F("#TYPE esphome_lock_failed gauge\n"));
 }
 void PrometheusHandler::lock_row_(AsyncResponseStream *stream, lock::Lock *obj) {
   if (obj->is_internal() && !this->include_internal_)