Your syntax for EEPROM.get() is not quite correct
EEPROM.put(addr, tankheight);
EEPROM.commit();
//val = EEPROM.get(addr);
EEPROM.get(addr,val);
Serial.print("Addr");
Serial.print(val);
Your syntax for EEPROM.get() is not quite correct
EEPROM.put(addr, tankheight);
EEPROM.commit();
//val = EEPROM.get(addr);
EEPROM.get(addr,val);
Serial.print("Addr");
Serial.print(val);