DTC It is recommended to get your boiler serviced once every year to ensure it is running efficiently and safely. DTC Services are fully qualified to carry out a service on your boiler, checking all aspects of the heating system to ensure it is safe and operating at maximum efficiency. Not only this, we will also provide a full diagnostic review to highlight anything that may need attention in the future, as well as advise you on any upgrades that may make your system run more efficiently, improving performance and saving you money.