Hi, Our plumber just told us to get two oil tanks as this is better but I can't for the life of me see the logic in it. He said it would be easier to monitor as one is for the cooker and the other can be used for the heating. Surely it would be harder and just to get one large one would be easier? I think he is saying this as it would cost more to put two in obviously, is he trying to pull a fast one?