If you have a digital monitor
If your tank has a digital monitor that plugs into an electric socket inside the house, such as an Apollo or Watchman, ordering when the digit reaches 2 (2 bars) is usually the ideal time.
Most systems are designed to flash at level 2. When the monitor starts flashing at these levels, you still have some oil left, so there’s no need to panic and turn off your heating – the flashing is merely a visible reminder to place your order.
If fitted correctly, the sensors are never placed on the bottom of the tank, so even when the monitor first registers zero or zero bars, approximately 10% of fuel will still be left in the tank.
Watch our Digital Monitor TOP TIPS video here