I have oil fired heating at home as we have no mains gas and it was built to be oil fired. Last week the tank ran dry, not for the first time, when our Watchman failed to tell me it was low, not for the first time. 
The boiler is around 12 years old and though I am told it was a great boiler when built I am considering replacing it, assuming (rightly or wrongly) that tech and efficiency will have improved in that time. I am unable to restart my current boiler so have a local engineer coming out next week to fix it but I am planning to discuss replacement options and wondered if we have any engineers here that can give me some pointers of what's good or what I need to consider.
Tank has 1800L in it having topped it up and sits about 50 yards from the boiler.

The boiler is around 12 years old and though I am told it was a great boiler when built I am considering replacing it, assuming (rightly or wrongly) that tech and efficiency will have improved in that time. I am unable to restart my current boiler so have a local engineer coming out next week to fix it but I am planning to discuss replacement options and wondered if we have any engineers here that can give me some pointers of what's good or what I need to consider.
Tank has 1800L in it having topped it up and sits about 50 yards from the boiler.