expansion tank – more info Home › Forums › Public Forums › General Plumbing › expansion tank – more info This topic has 1 reply, 2 voices, and was last updated 21 years, 11 months ago by NickHydro. Viewing 1 reply thread Author Posts 20 May 2002 at 8:52 pm #275554 MasterPlumbersKeymaster I was incomplete on first question…. More detail: it is Gas burner (Burnham) hot water system. 21 May 2002 at 12:03 am #292390 NickHydroParticipant There isnt usually a relief valve on top of expansion tanks. Might be one on an Extrol tank combination tank and fill. Water dumping usually means that there is something wrong with the tank. Author Posts Viewing 1 reply thread You must be logged in to reply to this topic. Log In Username: Password: Keep me signed in Log In