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thanks DH002F6
that what is my boiler man said - the positiion of the tanks is slightly nosedowned - by the first man who put it in years ago. But I never thought 50 litres of condensation could be in a tank especially since I got 100 litres of water out of it 2 years ago. He actually said that there is nothing wrong with the tank so I would be stupid to buy a new one cos the same thing could happen again However friends of mine said how come it does not happen to their tank which are all outside. Next time I need a load of oil I am going to get the tank washed out by a fella who could can do it and then put it on an even brick wall for it to sit on. DH what kind of stuff in the mean time should I buy to lag it with. because everything looks fairly tightened up. Again appreciate your answers. Thanks and does lagging the tank meaning all of outside it. Thanks again