I cover the expansion tank on a boiler system! This video is designed to help get a clear understanding of the layout of a boiler system! . . . #hvac #hvacinstallation #hvacinstall #hvaclife #hvactech #hvaccontractor #hvacservice #hvacr #hvactechnician #hvacrepair #hvactraining #hvacmaintenance #acservicetech #hvaccourse #hvacschool #hvacclass #hvactools #hvacproblems #hvacquality #hvacclass #acservice #boilersystem #boiler #tank #newtech #newtechnicians #acservicetech | AC Service Tech LLC