How much oil should i be using to heat 10 radiators from a c35 enviromax condensing boiler? Having to fill tank every month and it is on the lowest setting . What are we doing wrong. It is set to come on twice a day, 4-30am till 7-30 and 4-30 till 9-pm. Air intake valve set at 6, any answers anyone?

Ann &Rich, February 2010

We have 13 radiators ( inc. 2 small toilet rads ) and 1000 litres lasts us 3 months with timer settings similar to yours, new Worcester Condensing Boiler a couple of years back, so....unless your oil tank only holds 300 litres it sounds heavy. Probably worth getting a heating engineer to check it over.

Wayne, February 2010