We bought our guest house 2 years ago. It had an old oil boiler for heating the radiators and hot water.
It kept breaking down and was using a vast amount of oil. So after the first year we bought a new oil boiler. It cost £2,500 for the boiler and the fitting.
Well the new boiler is marvelous and it is probably saving us a fortune.
In the first year we filled the old boiler 4 times in a year. In the second year we filled the new boiler twice.

The old boiler cost us about £1260 in fuel costs.
The new boiler about £840.

At this rate I will be able to afford another boiler, but I don't know what I will do with it.
I would recommend an oil boiler to anyone except of course an Eskimo.