diff -r 6ff0f0a381b2 -r c2166b972811 src/EditProductTab1.cpp
--- a/src/EditProductTab1.cpp	Sat Oct 08 10:26:31 2022 +0200
+++ b/src/EditProductTab1.cpp	Sat Oct 08 14:33:36 2022 +0200
@@ -172,7 +172,7 @@
 void EditProduct::boil_time_changed(int val)
 {
     qDebug() << "boil_time_changed" << val;
-    double new_evap = (0.1 * product->batch_size) * val / 60.0;
+    double new_evap = product->eq_evap_rate * val / 60.0;
     product->boil_size = product->batch_size + new_evap;
     product->boil_time = val;
     ui->boil_sizeEdit->setValue(product->boil_size);
@@ -187,7 +187,7 @@
 {
     qDebug() << "batch_size_changed" << val << "old" << product->batch_size;
 
-    double evap = (0.1 * val) * product->boil_time / 60.0;
+    double evap = product->eq_evap_rate * product->boil_time / 60.0;
     product->boil_size = val + evap;
     double factor = val / product->batch_size;
     ui->boil_sizeEdit->setValue(product->boil_size);
@@ -276,8 +276,6 @@
     ui->notesEdit->setReadOnly(locked);
     ui->batch_sizeEdit->setReadOnly(stage > PROD_STAGE_WAIT);
     ui->batch_sizeEdit->setButtonSymbols((stage > PROD_STAGE_WAIT) ? QAbstractSpinBox::NoButtons : QAbstractSpinBox::UpDownArrows);
-    ui->boil_sizeEdit->setReadOnly(stage > PROD_STAGE_WAIT);
-    ui->boil_sizeEdit->setButtonSymbols((stage > PROD_STAGE_WAIT) ? QAbstractSpinBox::NoButtons : QAbstractSpinBox::UpDownArrows);
     ui->boil_timeEdit->setReadOnly(stage > PROD_STAGE_WAIT);
     ui->boil_timeEdit->setButtonSymbols((stage > PROD_STAGE_WAIT) ? QAbstractSpinBox::NoButtons : QAbstractSpinBox::UpDownArrows);
     ui->efficiencyEdit->setReadOnly(stage > PROD_STAGE_WAIT);