To begin though, it’s worth noting that an average boiler will burn between 3-4 litres per hour depending on the size of the boiler. So, in a two-bedroom home, during colder months if you had the boiler on for 5 hours a day that would be 17-18 litres per day. If you had a 1000 litre tank, you would then need to re-fill it after roughly 57 days 3.5 Litres (per hour) X 5 hours = 17.5 litres per day. 1000 litres ÷ 17.5 = 57.1428571429 (days of use) But remember this is just an example. In order to better quantify what you should be spending, there are a number of factors to consider that will affect your oil usage.Â
