One of the most frequently asked questions is about how much heating oil a home in Ireland is likely to use per year. How Much Heating Oil Does an Irish Home Use? Old tanks and poor quality heating oil are more likely to develop sludge and debris, which can damage your heating system and prevent it from running smoothly. You can reduce the amount you spend on heating oil by buying it at the most cost-effective times of the year, and this will be when demand for heating oil is lowest. High Quality Home Heating Oil in IrelandThe amount of oil your home uses will depend on its size and the way you use your heating.