diff --git a/HotWaterManager.h b/HotWaterManager.h
index 1b0af49..5afb79e 100644
--- a/HotWaterManager.h
+++ b/HotWaterManager.h
@@ -181,7 +181,7 @@
 // Structure definitions
 
 struct rom_t {
-    uint16_t epromchk; uint8_t brightness; uint8_t disptimeout; uint16_t vreq; uint16_t vfloat; uint16_t voff; int16_t pause; bool fahrenheit; int16_t tmin; int16_t ttarget; 
+    uint16_t epromchk; uint8_t brightness; uint8_t disptimeout; uint16_t vreq; uint16_t vfloat; uint16_t voff; int16_t pause; boolean fahrenheit; int16_t tmin; int16_t ttarget; 
     int16_t tsanity; int16_t tmax; int16_t tsandays; int16_t tnosan; uint16_t calibration; int16_t pumpdelta; uint16_t pumpafterrun; uint16_t hwv_timer; bool vmul; uint8_t hwv_pwm;
     uint8_t pumpMode; uint8_t ledmode; bool lcdglow; uint8_t holdon; uint8_t nightbright; uint8_t nightsensor; uint8_t relaypwm; bool altfunc;
 };
diff --git a/HotWaterManager.ino b/HotWaterManager.ino
index 1fd8e7c..5bf0b99 100644
--- a/HotWaterManager.ino
+++ b/HotWaterManager.ino
@@ -516,7 +516,7 @@ void loop() {
                     menuedit=!menuedit;                     // Long press is either exit or entry of a setup function
                     lcd.clear();
                     // Show the associated menu option
-                    printMenu(menusel-100,menuedit);
+                    printMenu(menusel-100,menuedit,rom.fahrenheit);
 
                     if(!menuedit && romdirty) {             // We are not in edit mode but made the rom "dirty"?
                         if(freset)
@@ -564,8 +564,8 @@ void loop() {
             lcd.clear();
             // Are we editing a setup menu item?
             if(menuedit) {                                  // Are we in edit mode?
-                editItem(menusel-100);                      // Edit the item
-                printMenu(menusel-100,menuedit);
+                editItem(menusel-100, rom.vmul);            // Edit the item
+                printMenu(menusel-100,menuedit,rom.fahrenheit);
             } else {                                        // Not in edit mode
                 if(menusel>=99) {                           // Are we in the setup menu?
                     nextMenuItem();                         // Advance to the next menu item
@@ -582,7 +582,7 @@ void loop() {
     } else {                                                // No button was pressed
         if(menusel>=100 && menuedit && getPgmVal(&menu[menusel-100].code)==MENU_SHOW) {
             lcd.setCursor(0,0);
-            printMenu(menusel-100,menuedit);                // This menu option has no timeout
+            printMenu(menusel-100,menuedit,rom.fahrenheit); // This menu option has no timeout
             
         } else {
             if(menusel && seconds()-menuseltimer>(MENUTIMEOUT)) {
@@ -669,7 +669,7 @@ void processmodes() {
         lcd.print(F("Tank  "));
     }
     
-    printTemperature(readtemp(src),1);                      // Display the temperature
+    printTemperature(readtemp(src),1,rom.fahrenheit);       // Display the temperature
     if(tempdata[src].failures)                              // If we failed to receive valid data from the sensor...
         lcd.write('?');                                     // ... indicate this with a question mark...
     else                                                    // ... othersiwse...
@@ -898,8 +898,8 @@ void heaterState(boolean state) {
     
     // Take care of the relay PWM if it has been configured
     if(state && rom.relaypwm<100 && digitalRead(HEATER) && seconds()-lastChange>2)
-        analogWrite12V(HEATER,rom.relaypwm);
-
+        analogWrite(HEATER,((uint16_t)rom.relaypwm*255)/100);// Set the PWM to the desired percentage.
+    
     // If we want to change state, do so only after at least some time has passed since the last change
     if((!state && seconds()-lastChange>rom.holdon) || (state && seconds()-lastChange>HOLD_OFF)) {
         if(state)                                           // If we switch the heater on...
@@ -907,11 +907,7 @@ void heaterState(boolean state) {
         if(digitalRead(HEATER)!=state) {                    // Need to change the heater state?
             lastChange=seconds();
             delay(20);
-            if(state)
-                analogWrite12V(HEATER,100);                 // Set heater output to 100%
-            else
-                analogWrite12V(HEATER,0);                   // Set heater output to 0%
-//            digitalWrite(HEATER,state);                     // Switch the heater
+            digitalWrite(HEATER,state);                     // Switch the heater
             if(rom.hwv_timer && !hwv && state)              // If we have a HWV and it is not on, and we switch on the heater...
                 setHWV(true,HWVBLEED);                      // ... switch on the HWV to equalize the pressure
         }        
@@ -931,28 +927,11 @@ void setHWV(bool state, uint16_t hwvtmr) {
     }
     hwv=state;                                              // Register the new state
     if(state)                                               // We want to switch it on
-        analogWrite12V(HWV,rom.hwv_pwm);                    // Use PWM for this
+        analogWrite(HWV,((uint16_t)rom.hwv_pwm*255)/100);   // Use PWM for this
     else                                                    // Otherwise
         digitalWrite(HWV,LOW);                              // Switch it off
 }
 
-
-void analogWrite12V(uint8_t port,uint8_t percent) {
-    if(percent>=100) {
-        digitalWrite(port,HIGH);                            // Set port to high so we can read back port state
-        if(rom.vmul)                                        // If 24V
-            analogWrite(port,127);                          // Set an initial value of 50%.
-    } else {
-        uint16_t val = ((uint16_t)percent*256)/100;
-        if(rom.vmul)                                        // In case of 24V
-            val/=2;                                         // Divide PWM by 2
-        analogWrite(port,val);
-    }
-    if(!percent)                                            // If we want to switch it completely off
-        digitalWrite(port,LOW);                             // Do a digitalWrite
-}
-
-
 // This routine will keep track whether there is a legionella chance
 boolean sanitycheck() {
     static boolean sancounting=false;
@@ -1026,7 +1005,7 @@ void fptr_showTemp() {
     lcd.setCursor(9,1);
     tempdata[0].mmaTemp.samples=0;
     tempdata[0].mmaTemp.sum=0;
-    printTemperature(readtemp(0),1);
+    printTemperature(readtemp(0),1,rom.fahrenheit);
 }
 
 void fptr_pumpsource() {
@@ -1048,9 +1027,9 @@ void fptr_pumpsource() {
 void fptr_showtemps() {
     lcd.setCursor(5,1);
     if(sensors.useDS && sensors.temphwa[1][0]) {
-        printTemperature(readtemp(0),0);
+        printTemperature(readtemp(0),0,rom.fahrenheit);
         lcd.print(" ");
-        printTemperature(readtemp(1),0);
+        printTemperature(readtemp(1),0,rom.fahrenheit);
     } else {
         lcd.print("N/A");
         swapTsens=false;
@@ -1123,7 +1102,7 @@ void fptr_serialnr() {
 #endif
     
 
-void printMenu(uint8_t item, boolean edit) {
+void printMenu(uint8_t item, boolean edit, boolean fahrenheit) {
     uint8_t code = getPgmVal(&menu[item].code);
     uint16_t value = getRomValue(code,item);
 
@@ -1147,7 +1126,7 @@ void printMenu(uint8_t item, boolean edit) {
         if(code & (MENU_8 | MENU_16)) {
             if(code & MENU_FLOAT)
                 if(code & MENU_TEMP)
-                    printTemperature(value,0);
+                    printTemperature(value,0,fahrenheit);
                 else
                     lcd.print((float) ((float)value/pow(10.0,(float)(code & MENU_FLOAT))), code & MENU_FLOAT);
             else
@@ -1188,7 +1167,7 @@ uint16_t getRomValue(uint8_t code, uint8_t item) {
 }
 
 
-void editItem(uint8_t item) {
+void editItem(uint8_t item, bool vmul) {
     uint8_t code = getPgmVal(&menu[item].code);
     
     if(code==MENU_SHOW)
@@ -1202,7 +1181,7 @@ void editItem(uint8_t item) {
 
     romdirty=true;                                          // Remember to save changes in EEPROM
     
-    if(code & MENU_VOLTS && rom.vmul) {                     // If some voltage menu option is selected and we operate on a 24V system...
+    if(code & MENU_VOLTS && vmul) {                         // If some voltage menu option is selected and we operate on a 24V system...
         step*=2; max*=2; min*=2;                            // Multiply all voltage steps, minimums and maximums by two.
     }
 
@@ -1234,7 +1213,7 @@ void nextMenuItem() {
             menusel=100;                                    // Reached the last one, rewind to the first one
         fn=getPgmVal(&menu[menusel-100].sfx);
     } while((rom.altfunc && ( fn & NOALT)) || (!rom.altfunc && (fn & FNALT)) );
-    printMenu(menusel-100,menuedit);
+    printMenu(menusel-100,menuedit,rom.fahrenheit);
 }
 
 
@@ -1382,8 +1361,8 @@ const char* pgmLcdPrint(const char *txt) {
 }
 
 
-void printTemperature(int16_t value,uint8_t precision) {
-    if(rom.fahrenheit) {
+void printTemperature(int16_t value,uint8_t precision, boolean fahrenheit) {
+    if(fahrenheit) {
         lcd.print(((float)value*0.18)+32.0,precision);
         lcd.print("\xDF""F");
         if(precision && (float)value*0.18+32.0<100)
diff --git a/Installation_Basic.kicad_sch b/Installation_Basic.kicad_sch
deleted file mode 100644
index 5a35a1f..0000000
--- a/Installation_Basic.kicad_sch
+++ /dev/null
@@ -1,1710 +0,0 @@
-(kicad_sch
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