Quest piping above water heater Home › Forums › Public Forums › General Plumbing › Quest piping above water heater This topic has 2 replies, 3 voices, and was last updated 21 years, 10 months ago by johnws. Viewing 2 reply threads Author Posts 12 Nov 2002 at 11:08 pm #275982 Robert Maw Can the quest piping (poly) be installed directly to a water heater? Should it be copper within 18″?thanks 12 Nov 2002 at 11:48 pm #293224 Retired plbg1Participant I never did use that stuff before but I would say if you use it be at least 24″ from the connection with copper, check you local code. 14 Nov 2002 at 12:13 am #293225 johnwsParticipant NO!The brand should be stamped on the pipe. Ring the manufacturer to get his installation instructions. Usually it is 0.9-1m min. Also check local plumbing code. Author Posts Viewing 2 reply threads You must be logged in to reply to this topic. Log In Username: Password: Keep me signed in Log In