A flat of 100 square metres is taken as an example. Said flat needs 1,200 litres of heating oil for the winter season. In October 2011, the price per litre of heating oil ranged between 0.90 and 0.92 euro. This winter, it starts from 1.40 euro per litre, which means that the household of the example flat must spend 1,680 euro for heating in the traditional way.