My cold girlfriend and I are just about to order an oil tank for the cellar. But I am unsure what capacity to request. Naturally, one does not want to refill it every month: once a year would be just about bearable. It is a holiday home, stone built, 4-large bedrooms. It'll need about 10 radiators and I think the bioler will need to push out 25kw. We will have it on for heating and hot water for 4 weeks in the winter when we visit. Will a 1,000-litre tank be sufficient? I appreciate I may not have given enough information, here but can anyone help? Thanks Julian 34 (age and region)