For your free estimate or more information. Download bim and cad files for potterton commercial products. Journey plumbers with 5+ years of experience. This latest post explores how oil interceptors work, the benefits of using them at your setting and the role we can play in ensuring they are set up correctly. Yes your boiler should be professionally maintained at least once a year if you have an oil-fired boiler, a burner service should be performed annually by our oil delivery company. This extra.