diff --git a/components/opentherm/output/output.cpp b/components/opentherm/output/output.cpp
index 872fcb8..3fab1f2 100644
--- a/components/opentherm/output/output.cpp
+++ b/components/opentherm/output/output.cpp
@@ -1,4 +1,4 @@
-#include "esphome/core/helpers.h" // for clamp()
+#include "esphome/core/helpers.h" // for clamp() and lerp()
 #include "output.h"
 
 namespace esphome {
@@ -6,7 +6,8 @@ namespace opentherm {
 
 void opentherm::OpenthermOutput::write_state(float state) {
   ESP_LOGD("opentherm.output", "Received state: %.2f. Min value: %.2f, max value: %.2f", state, min_value_, max_value_);
-  this->state = state < 0.003 && this->zero_means_zero_ ? 0.0 : clamp(min_value_ + state * (max_value_ - min_value_), min_value_, max_value_);
+  state = state < 0.003 && this->zero_means_zero_ ? 0.0 : lerp(state, min_value_, max_value_);
+  this->state = clamp(state, min_value_, max_value_);
   this->has_state_ = true;
   ESP_LOGD("opentherm.output", "Output %s set to %.2f", this->id_, this->state);
 }